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authorKrzysztof Hałasa <khc@pm.waw.pl>2008-08-14 13:18:17 -0400
committerKrzysztof Hałasa <khc@pm.waw.pl>2008-11-21 20:49:48 -0500
commit72364706c3b7c09a658e356218a918c5f92dcad0 (patch)
tree3d03826adf0fdb2a049fa5af8018590883b533ad /drivers/net/wan
parente022c2f07ae52bfbd92faa273db0db2f34eb28e8 (diff)
WAN: syncppp.c is no longer used by any kernel code. Remove it.
Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>
Diffstat (limited to 'drivers/net/wan')
-rw-r--r--drivers/net/wan/syncppp.c1476
1 files changed, 0 insertions, 1476 deletions
diff --git a/drivers/net/wan/syncppp.c b/drivers/net/wan/syncppp.c
deleted file mode 100644
index 58ae8a2223af..000000000000
--- a/drivers/net/wan/syncppp.c
+++ /dev/null
@@ -1,1476 +0,0 @@
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
107struct ppp_header {
108 u8 address;
109 u8 control;
110 __be16 protocol;
111};
112#define PPP_HEADER_LEN sizeof (struct ppp_header)
113
114struct lcp_header {
115 u8 type;
116 u8 ident;
117 __be16 len;
118};
119#define LCP_HEADER_LEN sizeof (struct lcp_header)
120
121struct 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
132static struct sppp *spppq;
133static struct timer_list sppp_keepalive_timer;
134static DEFINE_SPINLOCK(spppq_lock);
135
136/* global xmit queue for sending packets while spinlock is held */
137static struct sk_buff_head tx_queue;
138
139static void sppp_keepalive (unsigned long dummy);
140static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type,
141 u8 ident, u16 len, void *data);
142static void sppp_cisco_send (struct sppp *sp, int type, u32 par1, u32 par2);
143static void sppp_lcp_input (struct sppp *sp, struct sk_buff *m);
144static void sppp_cisco_input (struct sppp *sp, struct sk_buff *m);
145static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *m);
146static void sppp_lcp_open (struct sppp *sp);
147static void sppp_ipcp_open (struct sppp *sp);
148static int sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h,
149 int len, u32 *magic);
150static void sppp_cp_timeout (unsigned long arg);
151static char *sppp_lcp_type_name (u8 type);
152static char *sppp_ipcp_type_name (u8 type);
153static void sppp_print_bytes (u8 *p, u16 len);
154
155static 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 */
165static 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
176static 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
187static 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
200static 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
224static 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 goto done;
288 }
289 break;
290#ifdef IPX
291 case PPP_IPX:
292 /* IPX IPXCP not implemented yet */
293 if (sp->lcp.state == LCP_STATE_OPENED) {
294 skb->protocol=htons(ETH_P_IPX);
295 netif_rx(skb);
296 goto done;
297 }
298 break;
299#endif
300 }
301 break;
302 case CISCO_MULTICAST:
303 case CISCO_UNICAST:
304 /* Don't check the control field here (RFC 1547). */
305 if (! (sp->pp_flags & PP_CISCO)) {
306 if (sp->pp_flags & PP_DEBUG)
307 printk (KERN_WARNING "%s: Cisco packet in PPP mode <0x%x 0x%x 0x%x>\n",
308 dev->name,
309 h->address, h->control, ntohs (h->protocol));
310 goto drop;
311 }
312 switch (ntohs (h->protocol)) {
313 default:
314 goto invalid;
315 case CISCO_KEEPALIVE:
316 sppp_cisco_input (sp, skb);
317 goto drop;
318#ifdef CONFIG_INET
319 case ETH_P_IP:
320 skb->protocol=htons(ETH_P_IP);
321 netif_rx(skb);
322 goto done;
323#endif
324#ifdef CONFIG_IPX
325 case ETH_P_IPX:
326 skb->protocol=htons(ETH_P_IPX);
327 netif_rx(skb);
328 goto done;
329#endif
330 }
331 break;
332 }
333 goto drop;
334
335invalid:
336 if (sp->pp_flags & PP_DEBUG)
337 printk (KERN_WARNING "%s: invalid input packet <0x%x 0x%x 0x%x>\n",
338 dev->name, h->address, h->control, ntohs (h->protocol));
339drop:
340 kfree_skb(skb);
341done:
342 spin_unlock_irqrestore(&sp->lock, flags);
343 sppp_flush_xmit();
344 return;
345}
346
347/*
348 * Handle transmit packets.
349 */
350
351static int sppp_hard_header(struct sk_buff *skb,
352 struct net_device *dev, __u16 type,
353 const void *daddr, const void *saddr,
354 unsigned int len)
355{
356 struct sppp *sp = (struct sppp *)sppp_of(dev);
357 struct ppp_header *h;
358 skb_push(skb,sizeof(struct ppp_header));
359 h=(struct ppp_header *)skb->data;
360 if(sp->pp_flags&PP_CISCO)
361 {
362 h->address = CISCO_UNICAST;
363 h->control = 0;
364 }
365 else
366 {
367 h->address = PPP_ALLSTATIONS;
368 h->control = PPP_UI;
369 }
370 if(sp->pp_flags & PP_CISCO)
371 {
372 h->protocol = htons(type);
373 }
374 else switch(type)
375 {
376 case ETH_P_IP:
377 h->protocol = htons(PPP_IP);
378 break;
379 case ETH_P_IPX:
380 h->protocol = htons(PPP_IPX);
381 break;
382 }
383 return sizeof(struct ppp_header);
384}
385
386static const struct header_ops sppp_header_ops = {
387 .create = sppp_hard_header,
388};
389
390/*
391 * Send keepalive packets, every 10 seconds.
392 */
393
394static void sppp_keepalive (unsigned long dummy)
395{
396 struct sppp *sp;
397 unsigned long flags;
398
399 spin_lock_irqsave(&spppq_lock, flags);
400
401 for (sp=spppq; sp; sp=sp->pp_next)
402 {
403 struct net_device *dev = sp->pp_if;
404
405 /* Keepalive mode disabled or channel down? */
406 if (! (sp->pp_flags & PP_KEEPALIVE) ||
407 ! (dev->flags & IFF_UP))
408 continue;
409
410 spin_lock(&sp->lock);
411
412 /* No keepalive in PPP mode if LCP not opened yet. */
413 if (! (sp->pp_flags & PP_CISCO) &&
414 sp->lcp.state != LCP_STATE_OPENED) {
415 spin_unlock(&sp->lock);
416 continue;
417 }
418
419 if (sp->pp_alivecnt == MAXALIVECNT) {
420 /* No keepalive packets got. Stop the interface. */
421 printk (KERN_WARNING "%s: protocol down\n", dev->name);
422 if_down (dev);
423 if (! (sp->pp_flags & PP_CISCO)) {
424 /* Shut down the PPP link. */
425 sp->lcp.magic = jiffies;
426 sp->lcp.state = LCP_STATE_CLOSED;
427 sp->ipcp.state = IPCP_STATE_CLOSED;
428 sppp_clear_timeout (sp);
429 /* Initiate negotiation. */
430 sppp_lcp_open (sp);
431 }
432 }
433 if (sp->pp_alivecnt <= MAXALIVECNT)
434 ++sp->pp_alivecnt;
435 if (sp->pp_flags & PP_CISCO)
436 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq,
437 sp->pp_rseq);
438 else if (sp->lcp.state == LCP_STATE_OPENED) {
439 __be32 nmagic = htonl (sp->lcp.magic);
440 sp->lcp.echoid = ++sp->pp_seq;
441 sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REQ,
442 sp->lcp.echoid, 4, &nmagic);
443 }
444
445 spin_unlock(&sp->lock);
446 }
447 spin_unlock_irqrestore(&spppq_lock, flags);
448 sppp_flush_xmit();
449 sppp_keepalive_timer.expires=jiffies+10*HZ;
450 add_timer(&sppp_keepalive_timer);
451}
452
453/*
454 * Handle incoming PPP Link Control Protocol packets.
455 */
456
457static void sppp_lcp_input (struct sppp *sp, struct sk_buff *skb)
458{
459 struct lcp_header *h;
460 struct net_device *dev = sp->pp_if;
461 int len = skb->len;
462 u8 *p, opt[6];
463 u32 rmagic = 0;
464
465 if (!pskb_may_pull(skb, sizeof(struct lcp_header))) {
466 if (sp->pp_flags & PP_DEBUG)
467 printk (KERN_WARNING "%s: invalid lcp packet length: %d bytes\n",
468 dev->name, len);
469 return;
470 }
471 h = (struct lcp_header *)skb->data;
472 skb_pull(skb,sizeof(struct lcp_header *));
473
474 if (sp->pp_flags & PP_DEBUG)
475 {
476 char state = '?';
477 switch (sp->lcp.state) {
478 case LCP_STATE_CLOSED: state = 'C'; break;
479 case LCP_STATE_ACK_RCVD: state = 'R'; break;
480 case LCP_STATE_ACK_SENT: state = 'S'; break;
481 case LCP_STATE_OPENED: state = 'O'; break;
482 }
483 printk (KERN_WARNING "%s: lcp input(%c): %d bytes <%s id=%xh len=%xh",
484 dev->name, state, len,
485 sppp_lcp_type_name (h->type), h->ident, ntohs (h->len));
486 if (len > 4)
487 sppp_print_bytes ((u8*) (h+1), len-4);
488 printk (">\n");
489 }
490 if (len > ntohs (h->len))
491 len = ntohs (h->len);
492 switch (h->type) {
493 default:
494 /* Unknown packet type -- send Code-Reject packet. */
495 sppp_cp_send (sp, PPP_LCP, LCP_CODE_REJ, ++sp->pp_seq,
496 skb->len, h);
497 break;
498 case LCP_CONF_REQ:
499 if (len < 4) {
500 if (sp->pp_flags & PP_DEBUG)
501 printk (KERN_DEBUG"%s: invalid lcp configure request packet length: %d bytes\n",
502 dev->name, len);
503 break;
504 }
505 if (len>4 && !sppp_lcp_conf_parse_options (sp, h, len, &rmagic))
506 goto badreq;
507 if (rmagic == sp->lcp.magic) {
508 /* Local and remote magics equal -- loopback? */
509 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
510 printk (KERN_WARNING "%s: loopback\n",
511 dev->name);
512 sp->pp_loopcnt = 0;
513 if (dev->flags & IFF_UP) {
514 if_down (dev);
515 }
516 } else if (sp->pp_flags & PP_DEBUG)
517 printk (KERN_DEBUG "%s: conf req: magic glitch\n",
518 dev->name);
519 ++sp->pp_loopcnt;
520
521 /* MUST send Conf-Nack packet. */
522 rmagic = ~sp->lcp.magic;
523 opt[0] = LCP_OPT_MAGIC;
524 opt[1] = sizeof (opt);
525 opt[2] = rmagic >> 24;
526 opt[3] = rmagic >> 16;
527 opt[4] = rmagic >> 8;
528 opt[5] = rmagic;
529 sppp_cp_send (sp, PPP_LCP, LCP_CONF_NAK,
530 h->ident, sizeof (opt), &opt);
531badreq:
532 switch (sp->lcp.state) {
533 case LCP_STATE_OPENED:
534 /* Initiate renegotiation. */
535 sppp_lcp_open (sp);
536 /* fall through... */
537 case LCP_STATE_ACK_SENT:
538 /* Go to closed state. */
539 sp->lcp.state = LCP_STATE_CLOSED;
540 sp->ipcp.state = IPCP_STATE_CLOSED;
541 }
542 break;
543 }
544 /* Send Configure-Ack packet. */
545 sp->pp_loopcnt = 0;
546 if (sp->lcp.state != LCP_STATE_OPENED) {
547 sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK,
548 h->ident, len-4, h+1);
549 }
550 /* Change the state. */
551 switch (sp->lcp.state) {
552 case LCP_STATE_CLOSED:
553 sp->lcp.state = LCP_STATE_ACK_SENT;
554 break;
555 case LCP_STATE_ACK_RCVD:
556 sp->lcp.state = LCP_STATE_OPENED;
557 sppp_ipcp_open (sp);
558 break;
559 case LCP_STATE_OPENED:
560 /* Remote magic changed -- close session. */
561 sp->lcp.state = LCP_STATE_CLOSED;
562 sp->ipcp.state = IPCP_STATE_CLOSED;
563 /* Initiate renegotiation. */
564 sppp_lcp_open (sp);
565 /* Send ACK after our REQ in attempt to break loop */
566 sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK,
567 h->ident, len-4, h+1);
568 sp->lcp.state = LCP_STATE_ACK_SENT;
569 break;
570 }
571 break;
572 case LCP_CONF_ACK:
573 if (h->ident != sp->lcp.confid)
574 break;
575 sppp_clear_timeout (sp);
576 if ((sp->pp_link_state != SPPP_LINK_UP) &&
577 (dev->flags & IFF_UP)) {
578 /* Coming out of loopback mode. */
579 sp->pp_link_state=SPPP_LINK_UP;
580 printk (KERN_INFO "%s: protocol up\n", dev->name);
581 }
582 switch (sp->lcp.state) {
583 case LCP_STATE_CLOSED:
584 sp->lcp.state = LCP_STATE_ACK_RCVD;
585 sppp_set_timeout (sp, 5);
586 break;
587 case LCP_STATE_ACK_SENT:
588 sp->lcp.state = LCP_STATE_OPENED;
589 sppp_ipcp_open (sp);
590 break;
591 }
592 break;
593 case LCP_CONF_NAK:
594 if (h->ident != sp->lcp.confid)
595 break;
596 p = (u8*) (h+1);
597 if (len>=10 && p[0] == LCP_OPT_MAGIC && p[1] >= 4) {
598 rmagic = (u32)p[2] << 24 |
599 (u32)p[3] << 16 | p[4] << 8 | p[5];
600 if (rmagic == ~sp->lcp.magic) {
601 int newmagic;
602 if (sp->pp_flags & PP_DEBUG)
603 printk (KERN_DEBUG "%s: conf nak: magic glitch\n",
604 dev->name);
605 get_random_bytes(&newmagic, sizeof(newmagic));
606 sp->lcp.magic += newmagic;
607 } else
608 sp->lcp.magic = rmagic;
609 }
610 if (sp->lcp.state != LCP_STATE_ACK_SENT) {
611 /* Go to closed state. */
612 sp->lcp.state = LCP_STATE_CLOSED;
613 sp->ipcp.state = IPCP_STATE_CLOSED;
614 }
615 /* The link will be renegotiated after timeout,
616 * to avoid endless req-nack loop. */
617 sppp_clear_timeout (sp);
618 sppp_set_timeout (sp, 2);
619 break;
620 case LCP_CONF_REJ:
621 if (h->ident != sp->lcp.confid)
622 break;
623 sppp_clear_timeout (sp);
624 /* Initiate renegotiation. */
625 sppp_lcp_open (sp);
626 if (sp->lcp.state != LCP_STATE_ACK_SENT) {
627 /* Go to closed state. */
628 sp->lcp.state = LCP_STATE_CLOSED;
629 sp->ipcp.state = IPCP_STATE_CLOSED;
630 }
631 break;
632 case LCP_TERM_REQ:
633 sppp_clear_timeout (sp);
634 /* Send Terminate-Ack packet. */
635 sppp_cp_send (sp, PPP_LCP, LCP_TERM_ACK, h->ident, 0, NULL);
636 /* Go to closed state. */
637 sp->lcp.state = LCP_STATE_CLOSED;
638 sp->ipcp.state = IPCP_STATE_CLOSED;
639 /* Initiate renegotiation. */
640 sppp_lcp_open (sp);
641 break;
642 case LCP_TERM_ACK:
643 case LCP_CODE_REJ:
644 case LCP_PROTO_REJ:
645 /* Ignore for now. */
646 break;
647 case LCP_DISC_REQ:
648 /* Discard the packet. */
649 break;
650 case LCP_ECHO_REQ:
651 if (sp->lcp.state != LCP_STATE_OPENED)
652 break;
653 if (len < 8) {
654 if (sp->pp_flags & PP_DEBUG)
655 printk (KERN_WARNING "%s: invalid lcp echo request packet length: %d bytes\n",
656 dev->name, len);
657 break;
658 }
659 if (ntohl (*(__be32*)(h+1)) == sp->lcp.magic) {
660 /* Line loopback mode detected. */
661 printk (KERN_WARNING "%s: loopback\n", dev->name);
662 if_down (dev);
663
664 /* Shut down the PPP link. */
665 sp->lcp.state = LCP_STATE_CLOSED;
666 sp->ipcp.state = IPCP_STATE_CLOSED;
667 sppp_clear_timeout (sp);
668 /* Initiate negotiation. */
669 sppp_lcp_open (sp);
670 break;
671 }
672 *(__be32 *)(h+1) = htonl (sp->lcp.magic);
673 sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REPLY, h->ident, len-4, h+1);
674 break;
675 case LCP_ECHO_REPLY:
676 if (h->ident != sp->lcp.echoid)
677 break;
678 if (len < 8) {
679 if (sp->pp_flags & PP_DEBUG)
680 printk (KERN_WARNING "%s: invalid lcp echo reply packet length: %d bytes\n",
681 dev->name, len);
682 break;
683 }
684 if (ntohl(*(__be32 *)(h+1)) != sp->lcp.magic)
685 sp->pp_alivecnt = 0;
686 break;
687 }
688}
689
690/*
691 * Handle incoming Cisco keepalive protocol packets.
692 */
693
694static void sppp_cisco_input (struct sppp *sp, struct sk_buff *skb)
695{
696 struct cisco_packet *h;
697 struct net_device *dev = sp->pp_if;
698
699 if (!pskb_may_pull(skb, sizeof(struct cisco_packet))
700 || (skb->len != CISCO_PACKET_LEN
701 && skb->len != CISCO_BIG_PACKET_LEN)) {
702 if (sp->pp_flags & PP_DEBUG)
703 printk (KERN_WARNING "%s: invalid cisco packet length: %d bytes\n",
704 dev->name, skb->len);
705 return;
706 }
707 h = (struct cisco_packet *)skb->data;
708 skb_pull(skb, sizeof(struct cisco_packet*));
709 if (sp->pp_flags & PP_DEBUG)
710 printk (KERN_WARNING "%s: cisco input: %d bytes <%xh %xh %xh %xh %xh-%xh>\n",
711 dev->name, skb->len,
712 ntohl (h->type), h->par1, h->par2, h->rel,
713 h->time0, h->time1);
714 switch (ntohl (h->type)) {
715 default:
716 if (sp->pp_flags & PP_DEBUG)
717 printk (KERN_WARNING "%s: unknown cisco packet type: 0x%x\n",
718 dev->name, ntohl (h->type));
719 break;
720 case CISCO_ADDR_REPLY:
721 /* Reply on address request, ignore */
722 break;
723 case CISCO_KEEPALIVE_REQ:
724 sp->pp_alivecnt = 0;
725 sp->pp_rseq = ntohl (h->par1);
726 if (sp->pp_seq == sp->pp_rseq) {
727 /* Local and remote sequence numbers are equal.
728 * Probably, the line is in loopback mode. */
729 int newseq;
730 if (sp->pp_loopcnt >= MAXALIVECNT) {
731 printk (KERN_WARNING "%s: loopback\n",
732 dev->name);
733 sp->pp_loopcnt = 0;
734 if (dev->flags & IFF_UP) {
735 if_down (dev);
736 }
737 }
738 ++sp->pp_loopcnt;
739
740 /* Generate new local sequence number */
741 get_random_bytes(&newseq, sizeof(newseq));
742 sp->pp_seq ^= newseq;
743 break;
744 }
745 sp->pp_loopcnt = 0;
746 if (sp->pp_link_state==SPPP_LINK_DOWN &&
747 (dev->flags & IFF_UP)) {
748 sp->pp_link_state=SPPP_LINK_UP;
749 printk (KERN_INFO "%s: protocol up\n", dev->name);
750 }
751 break;
752 case CISCO_ADDR_REQ:
753 /* Stolen from net/ipv4/devinet.c -- SIOCGIFADDR ioctl */
754 {
755 __be32 addr = 0, mask = htonl(~0U); /* FIXME: is the mask correct? */
756#ifdef CONFIG_INET
757 struct in_device *in_dev;
758 struct in_ifaddr *ifa;
759
760 rcu_read_lock();
761 if ((in_dev = __in_dev_get_rcu(dev)) != NULL)
762 {
763 for (ifa=in_dev->ifa_list; ifa != NULL;
764 ifa=ifa->ifa_next) {
765 if (strcmp(dev->name, ifa->ifa_label) == 0)
766 {
767 addr = ifa->ifa_local;
768 mask = ifa->ifa_mask;
769 break;
770 }
771 }
772 }
773 rcu_read_unlock();
774#endif
775 sppp_cisco_send (sp, CISCO_ADDR_REPLY, ntohl(addr), ntohl(mask));
776 break;
777 }
778 }
779}
780
781
782/*
783 * Send PPP LCP packet.
784 */
785
786static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type,
787 u8 ident, u16 len, void *data)
788{
789 struct ppp_header *h;
790 struct lcp_header *lh;
791 struct sk_buff *skb;
792 struct net_device *dev = sp->pp_if;
793
794 skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+LCP_HEADER_LEN+len,
795 GFP_ATOMIC);
796 if (skb==NULL)
797 return;
798
799 skb_reserve(skb,dev->hard_header_len);
800
801 h = (struct ppp_header *)skb_put(skb, sizeof(struct ppp_header));
802 h->address = PPP_ALLSTATIONS; /* broadcast address */
803 h->control = PPP_UI; /* Unnumbered Info */
804 h->protocol = htons (proto); /* Link Control Protocol */
805
806 lh = (struct lcp_header *)skb_put(skb, sizeof(struct lcp_header));
807 lh->type = type;
808 lh->ident = ident;
809 lh->len = htons (LCP_HEADER_LEN + len);
810
811 if (len)
812 memcpy(skb_put(skb,len),data, len);
813
814 if (sp->pp_flags & PP_DEBUG) {
815 printk (KERN_WARNING "%s: %s output <%s id=%xh len=%xh",
816 dev->name,
817 proto==PPP_LCP ? "lcp" : "ipcp",
818 proto==PPP_LCP ? sppp_lcp_type_name (lh->type) :
819 sppp_ipcp_type_name (lh->type), lh->ident,
820 ntohs (lh->len));
821 if (len)
822 sppp_print_bytes ((u8*) (lh+1), len);
823 printk (">\n");
824 }
825 /* Control is high priority so it doesn't get queued behind data */
826 skb->priority=TC_PRIO_CONTROL;
827 skb->dev = dev;
828 skb_queue_tail(&tx_queue, skb);
829}
830
831/*
832 * Send Cisco keepalive packet.
833 */
834
835static void sppp_cisco_send (struct sppp *sp, int type, u32 par1, u32 par2)
836{
837 struct ppp_header *h;
838 struct cisco_packet *ch;
839 struct sk_buff *skb;
840 struct net_device *dev = sp->pp_if;
841 u32 t = jiffies * 1000/HZ;
842
843 skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+CISCO_PACKET_LEN,
844 GFP_ATOMIC);
845
846 if(skb==NULL)
847 return;
848
849 skb_reserve(skb, dev->hard_header_len);
850 h = (struct ppp_header *)skb_put (skb, sizeof(struct ppp_header));
851 h->address = CISCO_MULTICAST;
852 h->control = 0;
853 h->protocol = htons (CISCO_KEEPALIVE);
854
855 ch = (struct cisco_packet*)skb_put(skb, CISCO_PACKET_LEN);
856 ch->type = htonl (type);
857 ch->par1 = htonl (par1);
858 ch->par2 = htonl (par2);
859 ch->rel = htons(0xffff);
860 ch->time0 = htons ((u16) (t >> 16));
861 ch->time1 = htons ((u16) t);
862
863 if (sp->pp_flags & PP_DEBUG)
864 printk (KERN_WARNING "%s: cisco output: <%xh %xh %xh %xh %xh-%xh>\n",
865 dev->name, ntohl (ch->type), ch->par1,
866 ch->par2, ch->rel, ch->time0, ch->time1);
867 skb->priority=TC_PRIO_CONTROL;
868 skb->dev = dev;
869 skb_queue_tail(&tx_queue, skb);
870}
871
872/**
873 * sppp_close - close down a synchronous PPP or Cisco HDLC link
874 * @dev: The network device to drop the link of
875 *
876 * This drops the logical interface to the channel. It is not
877 * done politely as we assume we will also be dropping DTR. Any
878 * timeouts are killed.
879 */
880
881int sppp_close (struct net_device *dev)
882{
883 struct sppp *sp = (struct sppp *)sppp_of(dev);
884 unsigned long flags;
885
886 spin_lock_irqsave(&sp->lock, flags);
887 sp->pp_link_state = SPPP_LINK_DOWN;
888 sp->lcp.state = LCP_STATE_CLOSED;
889 sp->ipcp.state = IPCP_STATE_CLOSED;
890 sppp_clear_timeout (sp);
891 spin_unlock_irqrestore(&sp->lock, flags);
892
893 return 0;
894}
895
896EXPORT_SYMBOL(sppp_close);
897
898/**
899 * sppp_open - open a synchronous PPP or Cisco HDLC link
900 * @dev: Network device to activate
901 *
902 * Close down any existing synchronous session and commence
903 * from scratch. In the PPP case this means negotiating LCP/IPCP
904 * and friends, while for Cisco HDLC we simply need to start sending
905 * keepalives
906 */
907
908int sppp_open (struct net_device *dev)
909{
910 struct sppp *sp = (struct sppp *)sppp_of(dev);
911 unsigned long flags;
912
913 sppp_close(dev);
914
915 spin_lock_irqsave(&sp->lock, flags);
916 if (!(sp->pp_flags & PP_CISCO)) {
917 sppp_lcp_open (sp);
918 }
919 sp->pp_link_state = SPPP_LINK_DOWN;
920 spin_unlock_irqrestore(&sp->lock, flags);
921 sppp_flush_xmit();
922
923 return 0;
924}
925
926EXPORT_SYMBOL(sppp_open);
927
928/**
929 * sppp_reopen - notify of physical link loss
930 * @dev: Device that lost the link
931 *
932 * This function informs the synchronous protocol code that
933 * the underlying link died (for example a carrier drop on X.21)
934 *
935 * We increment the magic numbers to ensure that if the other end
936 * failed to notice we will correctly start a new session. It happens
937 * do to the nature of telco circuits is that you can lose carrier on
938 * one endonly.
939 *
940 * Having done this we go back to negotiating. This function may
941 * be called from an interrupt context.
942 */
943
944int sppp_reopen (struct net_device *dev)
945{
946 struct sppp *sp = (struct sppp *)sppp_of(dev);
947 unsigned long flags;
948
949 sppp_close(dev);
950
951 spin_lock_irqsave(&sp->lock, flags);
952 if (!(sp->pp_flags & PP_CISCO))
953 {
954 sp->lcp.magic = jiffies;
955 ++sp->pp_seq;
956 sp->lcp.state = LCP_STATE_CLOSED;
957 sp->ipcp.state = IPCP_STATE_CLOSED;
958 /* Give it a moment for the line to settle then go */
959 sppp_set_timeout (sp, 1);
960 }
961 sp->pp_link_state=SPPP_LINK_DOWN;
962 spin_unlock_irqrestore(&sp->lock, flags);
963
964 return 0;
965}
966
967EXPORT_SYMBOL(sppp_reopen);
968
969/**
970 * sppp_change_mtu - Change the link MTU
971 * @dev: Device to change MTU on
972 * @new_mtu: New MTU
973 *
974 * Change the MTU on the link. This can only be called with
975 * the link down. It returns an error if the link is up or
976 * the mtu is out of range.
977 */
978
979static int sppp_change_mtu(struct net_device *dev, int new_mtu)
980{
981 if(new_mtu<128||new_mtu>PPP_MTU||(dev->flags&IFF_UP))
982 return -EINVAL;
983 dev->mtu=new_mtu;
984 return 0;
985}
986
987/**
988 * sppp_do_ioctl - Ioctl handler for ppp/hdlc
989 * @dev: Device subject to ioctl
990 * @ifr: Interface request block from the user
991 * @cmd: Command that is being issued
992 *
993 * This function handles the ioctls that may be issued by the user
994 * to control the settings of a PPP/HDLC link. It does both busy
995 * and security checks. This function is intended to be wrapped by
996 * callers who wish to add additional ioctl calls of their own.
997 */
998
999int sppp_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1000{
1001 struct sppp *sp = (struct sppp *)sppp_of(dev);
1002
1003 if(dev->flags&IFF_UP)
1004 return -EBUSY;
1005
1006 if(!capable(CAP_NET_ADMIN))
1007 return -EPERM;
1008
1009 switch(cmd)
1010 {
1011 case SPPPIOCCISCO:
1012 sp->pp_flags|=PP_CISCO;
1013 dev->type = ARPHRD_HDLC;
1014 break;
1015 case SPPPIOCPPP:
1016 sp->pp_flags&=~PP_CISCO;
1017 dev->type = ARPHRD_PPP;
1018 break;
1019 case SPPPIOCDEBUG:
1020 sp->pp_flags&=~PP_DEBUG;
1021 if(ifr->ifr_flags)
1022 sp->pp_flags|=PP_DEBUG;
1023 break;
1024 case SPPPIOCGFLAGS:
1025 if(copy_to_user(ifr->ifr_data, &sp->pp_flags, sizeof(sp->pp_flags)))
1026 return -EFAULT;
1027 break;
1028 case SPPPIOCSFLAGS:
1029 if(copy_from_user(&sp->pp_flags, ifr->ifr_data, sizeof(sp->pp_flags)))
1030 return -EFAULT;
1031 break;
1032 default:
1033 return -EINVAL;
1034 }
1035 return 0;
1036}
1037
1038EXPORT_SYMBOL(sppp_do_ioctl);
1039
1040/**
1041 * sppp_attach - attach synchronous PPP/HDLC to a device
1042 * @pd: PPP device to initialise
1043 *
1044 * This initialises the PPP/HDLC support on an interface. At the
1045 * time of calling the dev element must point to the network device
1046 * that this interface is attached to. The interface should not yet
1047 * be registered.
1048 */
1049
1050void sppp_attach(struct ppp_device *pd)
1051{
1052 struct net_device *dev = pd->dev;
1053 struct sppp *sp = &pd->sppp;
1054 unsigned long flags;
1055
1056 /* Make sure embedding is safe for sppp_of */
1057 BUG_ON(sppp_of(dev) != sp);
1058
1059 spin_lock_irqsave(&spppq_lock, flags);
1060 /* Initialize keepalive handler. */
1061 if (! spppq)
1062 {
1063 init_timer(&sppp_keepalive_timer);
1064 sppp_keepalive_timer.expires=jiffies+10*HZ;
1065 sppp_keepalive_timer.function=sppp_keepalive;
1066 add_timer(&sppp_keepalive_timer);
1067 }
1068 /* Insert new entry into the keepalive list. */
1069 sp->pp_next = spppq;
1070 spppq = sp;
1071 spin_unlock_irqrestore(&spppq_lock, flags);
1072
1073 sp->pp_loopcnt = 0;
1074 sp->pp_alivecnt = 0;
1075 sp->pp_seq = 0;
1076 sp->pp_rseq = 0;
1077 sp->pp_flags = PP_KEEPALIVE|PP_CISCO|debug;/*PP_DEBUG;*/
1078 sp->lcp.magic = 0;
1079 sp->lcp.state = LCP_STATE_CLOSED;
1080 sp->ipcp.state = IPCP_STATE_CLOSED;
1081 sp->pp_if = dev;
1082 spin_lock_init(&sp->lock);
1083
1084 /*
1085 * Device specific setup. All but interrupt handler and
1086 * hard_start_xmit.
1087 */
1088
1089 dev->header_ops = &sppp_header_ops;
1090
1091 dev->tx_queue_len = 10;
1092 dev->type = ARPHRD_HDLC;
1093 dev->addr_len = 0;
1094 dev->hard_header_len = sizeof(struct ppp_header);
1095 dev->mtu = PPP_MTU;
1096 /*
1097 * These 4 are callers but MUST also call sppp_ functions
1098 */
1099 dev->do_ioctl = sppp_do_ioctl;
1100#if 0
1101 dev->get_stats = NULL; /* Let the driver override these */
1102 dev->open = sppp_open;
1103 dev->stop = sppp_close;
1104#endif
1105 dev->change_mtu = sppp_change_mtu;
1106 dev->flags = IFF_MULTICAST|IFF_POINTOPOINT|IFF_NOARP;
1107}
1108
1109EXPORT_SYMBOL(sppp_attach);
1110
1111/**
1112 * sppp_detach - release PPP resources from a device
1113 * @dev: Network device to release
1114 *
1115 * Stop and free up any PPP/HDLC resources used by this
1116 * interface. This must be called before the device is
1117 * freed.
1118 */
1119
1120void sppp_detach (struct net_device *dev)
1121{
1122 struct sppp **q, *p, *sp = (struct sppp *)sppp_of(dev);
1123 unsigned long flags;
1124
1125 spin_lock_irqsave(&spppq_lock, flags);
1126 /* Remove the entry from the keepalive list. */
1127 for (q = &spppq; (p = *q); q = &p->pp_next)
1128 if (p == sp) {
1129 *q = p->pp_next;
1130 break;
1131 }
1132
1133 /* Stop keepalive handler. */
1134 if (! spppq)
1135 del_timer(&sppp_keepalive_timer);
1136 sppp_clear_timeout (sp);
1137 spin_unlock_irqrestore(&spppq_lock, flags);
1138}
1139
1140EXPORT_SYMBOL(sppp_detach);
1141
1142/*
1143 * Analyze the LCP Configure-Request options list
1144 * for the presence of unknown options.
1145 * If the request contains unknown options, build and
1146 * send Configure-reject packet, containing only unknown options.
1147 */
1148static int
1149sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h,
1150 int len, u32 *magic)
1151{
1152 u8 *buf, *r, *p;
1153 int rlen;
1154
1155 len -= 4;
1156 buf = r = kmalloc (len, GFP_ATOMIC);
1157 if (! buf)
1158 return (0);
1159
1160 p = (void*) (h+1);
1161 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
1162 switch (*p) {
1163 case LCP_OPT_MAGIC:
1164 /* Magic number -- extract. */
1165 if (len >= 6 && p[1] == 6) {
1166 *magic = (u32)p[2] << 24 |
1167 (u32)p[3] << 16 | p[4] << 8 | p[5];
1168 continue;
1169 }
1170 break;
1171 case LCP_OPT_ASYNC_MAP:
1172 /* Async control character map -- check to be zero. */
1173 if (len >= 6 && p[1] == 6 && ! p[2] && ! p[3] &&
1174 ! p[4] && ! p[5])
1175 continue;
1176 break;
1177 case LCP_OPT_MRU:
1178 /* Maximum receive unit -- always OK. */
1179 continue;
1180 default:
1181 /* Others not supported. */
1182 break;
1183 }
1184 /* Add the option to rejected list. */
1185 memcpy(r, p, p[1]);
1186 r += p[1];
1187 rlen += p[1];
1188 }
1189 if (rlen)
1190 sppp_cp_send (sp, PPP_LCP, LCP_CONF_REJ, h->ident, rlen, buf);
1191 kfree(buf);
1192 return (rlen == 0);
1193}
1194
1195static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *skb)
1196{
1197 struct lcp_header *h;
1198 struct net_device *dev = sp->pp_if;
1199 int len = skb->len;
1200
1201 if (!pskb_may_pull(skb, sizeof(struct lcp_header))) {
1202 if (sp->pp_flags & PP_DEBUG)
1203 printk (KERN_WARNING "%s: invalid ipcp packet length: %d bytes\n",
1204 dev->name, len);
1205 return;
1206 }
1207 h = (struct lcp_header *)skb->data;
1208 skb_pull(skb,sizeof(struct lcp_header));
1209 if (sp->pp_flags & PP_DEBUG) {
1210 printk (KERN_WARNING "%s: ipcp input: %d bytes <%s id=%xh len=%xh",
1211 dev->name, len,
1212 sppp_ipcp_type_name (h->type), h->ident, ntohs (h->len));
1213 if (len > 4)
1214 sppp_print_bytes ((u8*) (h+1), len-4);
1215 printk (">\n");
1216 }
1217 if (len > ntohs (h->len))
1218 len = ntohs (h->len);
1219 switch (h->type) {
1220 default:
1221 /* Unknown packet type -- send Code-Reject packet. */
1222 sppp_cp_send (sp, PPP_IPCP, IPCP_CODE_REJ, ++sp->pp_seq, len, h);
1223 break;
1224 case IPCP_CONF_REQ:
1225 if (len < 4) {
1226 if (sp->pp_flags & PP_DEBUG)
1227 printk (KERN_WARNING "%s: invalid ipcp configure request packet length: %d bytes\n",
1228 dev->name, len);
1229 return;
1230 }
1231 if (len > 4) {
1232 sppp_cp_send (sp, PPP_IPCP, LCP_CONF_REJ, h->ident,
1233 len-4, h+1);
1234
1235 switch (sp->ipcp.state) {
1236 case IPCP_STATE_OPENED:
1237 /* Initiate renegotiation. */
1238 sppp_ipcp_open (sp);
1239 /* fall through... */
1240 case IPCP_STATE_ACK_SENT:
1241 /* Go to closed state. */
1242 sp->ipcp.state = IPCP_STATE_CLOSED;
1243 }
1244 } else {
1245 /* Send Configure-Ack packet. */
1246 sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_ACK, h->ident,
1247 0, NULL);
1248 /* Change the state. */
1249 if (sp->ipcp.state == IPCP_STATE_ACK_RCVD)
1250 sp->ipcp.state = IPCP_STATE_OPENED;
1251 else
1252 sp->ipcp.state = IPCP_STATE_ACK_SENT;
1253 }
1254 break;
1255 case IPCP_CONF_ACK:
1256 if (h->ident != sp->ipcp.confid)
1257 break;
1258 sppp_clear_timeout (sp);
1259 switch (sp->ipcp.state) {
1260 case IPCP_STATE_CLOSED:
1261 sp->ipcp.state = IPCP_STATE_ACK_RCVD;
1262 sppp_set_timeout (sp, 5);
1263 break;
1264 case IPCP_STATE_ACK_SENT:
1265 sp->ipcp.state = IPCP_STATE_OPENED;
1266 break;
1267 }
1268 break;
1269 case IPCP_CONF_NAK:
1270 case IPCP_CONF_REJ:
1271 if (h->ident != sp->ipcp.confid)
1272 break;
1273 sppp_clear_timeout (sp);
1274 /* Initiate renegotiation. */
1275 sppp_ipcp_open (sp);
1276 if (sp->ipcp.state != IPCP_STATE_ACK_SENT)
1277 /* Go to closed state. */
1278 sp->ipcp.state = IPCP_STATE_CLOSED;
1279 break;
1280 case IPCP_TERM_REQ:
1281 /* Send Terminate-Ack packet. */
1282 sppp_cp_send (sp, PPP_IPCP, IPCP_TERM_ACK, h->ident, 0, NULL);
1283 /* Go to closed state. */
1284 sp->ipcp.state = IPCP_STATE_CLOSED;
1285 /* Initiate renegotiation. */
1286 sppp_ipcp_open (sp);
1287 break;
1288 case IPCP_TERM_ACK:
1289 /* Ignore for now. */
1290 case IPCP_CODE_REJ:
1291 /* Ignore for now. */
1292 break;
1293 }
1294}
1295
1296static void sppp_lcp_open (struct sppp *sp)
1297{
1298 char opt[6];
1299
1300 if (! sp->lcp.magic)
1301 sp->lcp.magic = jiffies;
1302 opt[0] = LCP_OPT_MAGIC;
1303 opt[1] = sizeof (opt);
1304 opt[2] = sp->lcp.magic >> 24;
1305 opt[3] = sp->lcp.magic >> 16;
1306 opt[4] = sp->lcp.magic >> 8;
1307 opt[5] = sp->lcp.magic;
1308 sp->lcp.confid = ++sp->pp_seq;
1309 sppp_cp_send (sp, PPP_LCP, LCP_CONF_REQ, sp->lcp.confid,
1310 sizeof (opt), &opt);
1311 sppp_set_timeout (sp, 2);
1312}
1313
1314static void sppp_ipcp_open (struct sppp *sp)
1315{
1316 sp->ipcp.confid = ++sp->pp_seq;
1317 sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_REQ, sp->ipcp.confid, 0, NULL);
1318 sppp_set_timeout (sp, 2);
1319}
1320
1321/*
1322 * Process PPP control protocol timeouts.
1323 */
1324
1325static void sppp_cp_timeout (unsigned long arg)
1326{
1327 struct sppp *sp = (struct sppp*) arg;
1328 unsigned long flags;
1329
1330 spin_lock_irqsave(&sp->lock, flags);
1331
1332 sp->pp_flags &= ~PP_TIMO;
1333 if (! (sp->pp_if->flags & IFF_UP) || (sp->pp_flags & PP_CISCO)) {
1334 spin_unlock_irqrestore(&sp->lock, flags);
1335 return;
1336 }
1337 switch (sp->lcp.state) {
1338 case LCP_STATE_CLOSED:
1339 /* No ACK for Configure-Request, retry. */
1340 sppp_lcp_open (sp);
1341 break;
1342 case LCP_STATE_ACK_RCVD:
1343 /* ACK got, but no Configure-Request for peer, retry. */
1344 sppp_lcp_open (sp);
1345 sp->lcp.state = LCP_STATE_CLOSED;
1346 break;
1347 case LCP_STATE_ACK_SENT:
1348 /* ACK sent but no ACK for Configure-Request, retry. */
1349 sppp_lcp_open (sp);
1350 break;
1351 case LCP_STATE_OPENED:
1352 /* LCP is already OK, try IPCP. */
1353 switch (sp->ipcp.state) {
1354 case IPCP_STATE_CLOSED:
1355 /* No ACK for Configure-Request, retry. */
1356 sppp_ipcp_open (sp);
1357 break;
1358 case IPCP_STATE_ACK_RCVD:
1359 /* ACK got, but no Configure-Request for peer, retry. */
1360 sppp_ipcp_open (sp);
1361 sp->ipcp.state = IPCP_STATE_CLOSED;
1362 break;
1363 case IPCP_STATE_ACK_SENT:
1364 /* ACK sent but no ACK for Configure-Request, retry. */
1365 sppp_ipcp_open (sp);
1366 break;
1367 case IPCP_STATE_OPENED:
1368 /* IPCP is OK. */
1369 break;
1370 }
1371 break;
1372 }
1373 spin_unlock_irqrestore(&sp->lock, flags);
1374 sppp_flush_xmit();
1375}
1376
1377static char *sppp_lcp_type_name (u8 type)
1378{
1379 static char buf [8];
1380 switch (type) {
1381 case LCP_CONF_REQ: return ("conf-req");
1382 case LCP_CONF_ACK: return ("conf-ack");
1383 case LCP_CONF_NAK: return ("conf-nack");
1384 case LCP_CONF_REJ: return ("conf-rej");
1385 case LCP_TERM_REQ: return ("term-req");
1386 case LCP_TERM_ACK: return ("term-ack");
1387 case LCP_CODE_REJ: return ("code-rej");
1388 case LCP_PROTO_REJ: return ("proto-rej");
1389 case LCP_ECHO_REQ: return ("echo-req");
1390 case LCP_ECHO_REPLY: return ("echo-reply");
1391 case LCP_DISC_REQ: return ("discard-req");
1392 }
1393 sprintf (buf, "%xh", type);
1394 return (buf);
1395}
1396
1397static char *sppp_ipcp_type_name (u8 type)
1398{
1399 static char buf [8];
1400 switch (type) {
1401 case IPCP_CONF_REQ: return ("conf-req");
1402 case IPCP_CONF_ACK: return ("conf-ack");
1403 case IPCP_CONF_NAK: return ("conf-nack");
1404 case IPCP_CONF_REJ: return ("conf-rej");
1405 case IPCP_TERM_REQ: return ("term-req");
1406 case IPCP_TERM_ACK: return ("term-ack");
1407 case IPCP_CODE_REJ: return ("code-rej");
1408 }
1409 sprintf (buf, "%xh", type);
1410 return (buf);
1411}
1412
1413static void sppp_print_bytes (u_char *p, u16 len)
1414{
1415 printk (" %x", *p++);
1416 while (--len > 0)
1417 printk ("-%x", *p++);
1418}
1419
1420/**
1421 * sppp_rcv - receive and process a WAN PPP frame
1422 * @skb: The buffer to process
1423 * @dev: The device it arrived on
1424 * @p: Unused
1425 * @orig_dev: Unused
1426 *
1427 * Protocol glue. This drives the deferred processing mode the poorer
1428 * cards use. This can be called directly by cards that do not have
1429 * timing constraints but is normally called from the network layer
1430 * after interrupt servicing to process frames queued via netif_rx.
1431 */
1432
1433static int sppp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *p, struct net_device *orig_dev)
1434{
1435 if (dev_net(dev) != &init_net) {
1436 kfree_skb(skb);
1437 return 0;
1438 }
1439
1440 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
1441 return NET_RX_DROP;
1442 sppp_input(dev,skb);
1443 return 0;
1444}
1445
1446static struct packet_type sppp_packet_type = {
1447 .type = __constant_htons(ETH_P_WAN_PPP),
1448 .func = sppp_rcv,
1449};
1450
1451static char banner[] __initdata =
1452 KERN_INFO "Cronyx Ltd, Synchronous PPP and CISCO HDLC (c) 1994\n"
1453 KERN_INFO "Linux port (c) 1998 Building Number Three Ltd & "
1454 "Jan \"Yenya\" Kasprzak.\n";
1455
1456static int __init sync_ppp_init(void)
1457{
1458 if(debug)
1459 debug=PP_DEBUG;
1460 printk(banner);
1461 skb_queue_head_init(&tx_queue);
1462 dev_add_pack(&sppp_packet_type);
1463 return 0;
1464}
1465
1466
1467static void __exit sync_ppp_cleanup(void)
1468{
1469 dev_remove_pack(&sppp_packet_type);
1470}
1471
1472module_init(sync_ppp_init);
1473module_exit(sync_ppp_cleanup);
1474module_param(debug, int, 0);
1475MODULE_LICENSE("GPL");
1476
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 17:32:46 -0500