blob: 2d1bba06a08512d5d0a5af5bb8283ee9f9493922 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/config.h>
41#include <linux/module.h>
42#include <linux/kernel.h>
43#include <linux/errno.h>
44#include <linux/init.h>
45#include <linux/if_arp.h>
46#include <linux/skbuff.h>
47#include <linux/route.h>
48#include <linux/netdevice.h>
49#include <linux/inetdevice.h>
50#include <linux/random.h>
51#include <linux/pkt_sched.h>
52#include <linux/spinlock.h>
53#include <linux/rcupdate.h>
54
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 u16 protocol;
111};
112#define PPP_HEADER_LEN sizeof (struct ppp_header)
113
114struct lcp_header {
115 u8 type;
116 u8 ident;
117 u16 len;
118};
119#define LCP_HEADER_LEN sizeof (struct lcp_header)
120
121struct cisco_packet {
122 u32 type;
123 u32 par1;
124 u32 par2;
125 u16 rel;
126 u16 time0;
127 u16 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, long par1, long 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
Adrian Bunk7665a082005-09-09 23:17:28 -0700224static void sppp_input (struct net_device *dev, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225{
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->mac.raw=skb->data;
232
233 if (dev->flags & IFF_RUNNING)
234 {
235 /* Count received bytes, add FCS and one flag */
236 sp->ibytes+= skb->len + 3;
237 sp->ipkts++;
238 }
239
240 if (!pskb_may_pull(skb, PPP_HEADER_LEN)) {
241 /* Too small packet, drop it. */
242 if (sp->pp_flags & PP_DEBUG)
243 printk (KERN_DEBUG "%s: input packet is too small, %d bytes\n",
244 dev->name, skb->len);
245 kfree_skb(skb);
246 return;
247 }
248
249 /* Get PPP header. */
250 h = (struct ppp_header *)skb->data;
251 skb_pull(skb,sizeof(struct ppp_header));
252
253 spin_lock_irqsave(&sp->lock, flags);
254
255 switch (h->address) {
256 default: /* Invalid PPP packet. */
257 goto invalid;
258 case PPP_ALLSTATIONS:
259 if (h->control != PPP_UI)
260 goto invalid;
261 if (sp->pp_flags & PP_CISCO) {
262 if (sp->pp_flags & PP_DEBUG)
263 printk (KERN_WARNING "%s: PPP packet in Cisco mode <0x%x 0x%x 0x%x>\n",
264 dev->name,
265 h->address, h->control, ntohs (h->protocol));
266 goto drop;
267 }
268 switch (ntohs (h->protocol)) {
269 default:
270 if (sp->lcp.state == LCP_STATE_OPENED)
271 sppp_cp_send (sp, PPP_LCP, LCP_PROTO_REJ,
272 ++sp->pp_seq, skb->len + 2,
273 &h->protocol);
274 if (sp->pp_flags & PP_DEBUG)
275 printk (KERN_WARNING "%s: invalid input protocol <0x%x 0x%x 0x%x>\n",
276 dev->name,
277 h->address, h->control, ntohs (h->protocol));
278 goto drop;
279 case PPP_LCP:
280 sppp_lcp_input (sp, skb);
281 goto drop;
282 case PPP_IPCP:
283 if (sp->lcp.state == LCP_STATE_OPENED)
284 sppp_ipcp_input (sp, skb);
285 else
286 printk(KERN_DEBUG "IPCP when still waiting LCP finish.\n");
287 goto drop;
288 case PPP_IP:
289 if (sp->ipcp.state == IPCP_STATE_OPENED) {
290 if(sp->pp_flags&PP_DEBUG)
291 printk(KERN_DEBUG "Yow an IP frame.\n");
292 skb->protocol=htons(ETH_P_IP);
293 netif_rx(skb);
294 dev->last_rx = jiffies;
295 goto done;
296 }
297 break;
298#ifdef IPX
299 case PPP_IPX:
300 /* IPX IPXCP not implemented yet */
301 if (sp->lcp.state == LCP_STATE_OPENED) {
302 skb->protocol=htons(ETH_P_IPX);
303 netif_rx(skb);
304 dev->last_rx = jiffies;
305 goto done;
306 }
307 break;
308#endif
309 }
310 break;
311 case CISCO_MULTICAST:
312 case CISCO_UNICAST:
313 /* Don't check the control field here (RFC 1547). */
314 if (! (sp->pp_flags & PP_CISCO)) {
315 if (sp->pp_flags & PP_DEBUG)
316 printk (KERN_WARNING "%s: Cisco packet in PPP mode <0x%x 0x%x 0x%x>\n",
317 dev->name,
318 h->address, h->control, ntohs (h->protocol));
319 goto drop;
320 }
321 switch (ntohs (h->protocol)) {
322 default:
323 goto invalid;
324 case CISCO_KEEPALIVE:
325 sppp_cisco_input (sp, skb);
326 goto drop;
327#ifdef CONFIG_INET
328 case ETH_P_IP:
329 skb->protocol=htons(ETH_P_IP);
330 netif_rx(skb);
331 dev->last_rx = jiffies;
332 goto done;
333#endif
334#ifdef CONFIG_IPX
335 case ETH_P_IPX:
336 skb->protocol=htons(ETH_P_IPX);
337 netif_rx(skb);
338 dev->last_rx = jiffies;
339 goto done;
340#endif
341 }
342 break;
343 }
344 goto drop;
345
346invalid:
347 if (sp->pp_flags & PP_DEBUG)
348 printk (KERN_WARNING "%s: invalid input packet <0x%x 0x%x 0x%x>\n",
349 dev->name, h->address, h->control, ntohs (h->protocol));
350drop:
351 kfree_skb(skb);
352done:
353 spin_unlock_irqrestore(&sp->lock, flags);
354 sppp_flush_xmit();
355 return;
356}
357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358/*
359 * Handle transmit packets.
360 */
361
362static int sppp_hard_header(struct sk_buff *skb, struct net_device *dev, __u16 type,
363 void *daddr, void *saddr, unsigned int len)
364{
365 struct sppp *sp = (struct sppp *)sppp_of(dev);
366 struct ppp_header *h;
367 skb_push(skb,sizeof(struct ppp_header));
368 h=(struct ppp_header *)skb->data;
369 if(sp->pp_flags&PP_CISCO)
370 {
371 h->address = CISCO_UNICAST;
372 h->control = 0;
373 }
374 else
375 {
376 h->address = PPP_ALLSTATIONS;
377 h->control = PPP_UI;
378 }
379 if(sp->pp_flags & PP_CISCO)
380 {
381 h->protocol = htons(type);
382 }
383 else switch(type)
384 {
385 case ETH_P_IP:
386 h->protocol = htons(PPP_IP);
387 break;
388 case ETH_P_IPX:
389 h->protocol = htons(PPP_IPX);
390 break;
391 }
392 return sizeof(struct ppp_header);
393}
394
395static int sppp_rebuild_header(struct sk_buff *skb)
396{
397 return 0;
398}
399
400/*
401 * Send keepalive packets, every 10 seconds.
402 */
403
404static void sppp_keepalive (unsigned long dummy)
405{
406 struct sppp *sp;
407 unsigned long flags;
408
409 spin_lock_irqsave(&spppq_lock, flags);
410
411 for (sp=spppq; sp; sp=sp->pp_next)
412 {
413 struct net_device *dev = sp->pp_if;
414
415 /* Keepalive mode disabled or channel down? */
416 if (! (sp->pp_flags & PP_KEEPALIVE) ||
417 ! (dev->flags & IFF_UP))
418 continue;
419
420 spin_lock(&sp->lock);
421
422 /* No keepalive in PPP mode if LCP not opened yet. */
423 if (! (sp->pp_flags & PP_CISCO) &&
424 sp->lcp.state != LCP_STATE_OPENED) {
425 spin_unlock(&sp->lock);
426 continue;
427 }
428
429 if (sp->pp_alivecnt == MAXALIVECNT) {
430 /* No keepalive packets got. Stop the interface. */
431 printk (KERN_WARNING "%s: protocol down\n", dev->name);
432 if_down (dev);
433 if (! (sp->pp_flags & PP_CISCO)) {
434 /* Shut down the PPP link. */
435 sp->lcp.magic = jiffies;
436 sp->lcp.state = LCP_STATE_CLOSED;
437 sp->ipcp.state = IPCP_STATE_CLOSED;
438 sppp_clear_timeout (sp);
439 /* Initiate negotiation. */
440 sppp_lcp_open (sp);
441 }
442 }
443 if (sp->pp_alivecnt <= MAXALIVECNT)
444 ++sp->pp_alivecnt;
445 if (sp->pp_flags & PP_CISCO)
446 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq,
447 sp->pp_rseq);
448 else if (sp->lcp.state == LCP_STATE_OPENED) {
449 long nmagic = htonl (sp->lcp.magic);
450 sp->lcp.echoid = ++sp->pp_seq;
451 sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REQ,
452 sp->lcp.echoid, 4, &nmagic);
453 }
454
455 spin_unlock(&sp->lock);
456 }
457 spin_unlock_irqrestore(&spppq_lock, flags);
458 sppp_flush_xmit();
459 sppp_keepalive_timer.expires=jiffies+10*HZ;
460 add_timer(&sppp_keepalive_timer);
461}
462
463/*
464 * Handle incoming PPP Link Control Protocol packets.
465 */
466
467static void sppp_lcp_input (struct sppp *sp, struct sk_buff *skb)
468{
469 struct lcp_header *h;
470 struct net_device *dev = sp->pp_if;
471 int len = skb->len;
472 u8 *p, opt[6];
473 u32 rmagic;
474
475 if (!pskb_may_pull(skb, sizeof(struct lcp_header))) {
476 if (sp->pp_flags & PP_DEBUG)
477 printk (KERN_WARNING "%s: invalid lcp packet length: %d bytes\n",
478 dev->name, len);
479 return;
480 }
481 h = (struct lcp_header *)skb->data;
482 skb_pull(skb,sizeof(struct lcp_header *));
483
484 if (sp->pp_flags & PP_DEBUG)
485 {
486 char state = '?';
487 switch (sp->lcp.state) {
488 case LCP_STATE_CLOSED: state = 'C'; break;
489 case LCP_STATE_ACK_RCVD: state = 'R'; break;
490 case LCP_STATE_ACK_SENT: state = 'S'; break;
491 case LCP_STATE_OPENED: state = 'O'; break;
492 }
493 printk (KERN_WARNING "%s: lcp input(%c): %d bytes <%s id=%xh len=%xh",
494 dev->name, state, len,
495 sppp_lcp_type_name (h->type), h->ident, ntohs (h->len));
496 if (len > 4)
497 sppp_print_bytes ((u8*) (h+1), len-4);
498 printk (">\n");
499 }
500 if (len > ntohs (h->len))
501 len = ntohs (h->len);
502 switch (h->type) {
503 default:
504 /* Unknown packet type -- send Code-Reject packet. */
505 sppp_cp_send (sp, PPP_LCP, LCP_CODE_REJ, ++sp->pp_seq,
506 skb->len, h);
507 break;
508 case LCP_CONF_REQ:
509 if (len < 4) {
510 if (sp->pp_flags & PP_DEBUG)
511 printk (KERN_DEBUG"%s: invalid lcp configure request packet length: %d bytes\n",
512 dev->name, len);
513 break;
514 }
515 if (len>4 && !sppp_lcp_conf_parse_options (sp, h, len, &rmagic))
516 goto badreq;
517 if (rmagic == sp->lcp.magic) {
518 /* Local and remote magics equal -- loopback? */
519 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
520 printk (KERN_WARNING "%s: loopback\n",
521 dev->name);
522 sp->pp_loopcnt = 0;
523 if (dev->flags & IFF_UP) {
524 if_down (dev);
525 }
526 } else if (sp->pp_flags & PP_DEBUG)
527 printk (KERN_DEBUG "%s: conf req: magic glitch\n",
528 dev->name);
529 ++sp->pp_loopcnt;
530
531 /* MUST send Conf-Nack packet. */
532 rmagic = ~sp->lcp.magic;
533 opt[0] = LCP_OPT_MAGIC;
534 opt[1] = sizeof (opt);
535 opt[2] = rmagic >> 24;
536 opt[3] = rmagic >> 16;
537 opt[4] = rmagic >> 8;
538 opt[5] = rmagic;
539 sppp_cp_send (sp, PPP_LCP, LCP_CONF_NAK,
540 h->ident, sizeof (opt), &opt);
541badreq:
542 switch (sp->lcp.state) {
543 case LCP_STATE_OPENED:
544 /* Initiate renegotiation. */
545 sppp_lcp_open (sp);
546 /* fall through... */
547 case LCP_STATE_ACK_SENT:
548 /* Go to closed state. */
549 sp->lcp.state = LCP_STATE_CLOSED;
550 sp->ipcp.state = IPCP_STATE_CLOSED;
551 }
552 break;
553 }
554 /* Send Configure-Ack packet. */
555 sp->pp_loopcnt = 0;
556 if (sp->lcp.state != LCP_STATE_OPENED) {
557 sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK,
558 h->ident, len-4, h+1);
559 }
560 /* Change the state. */
561 switch (sp->lcp.state) {
562 case LCP_STATE_CLOSED:
563 sp->lcp.state = LCP_STATE_ACK_SENT;
564 break;
565 case LCP_STATE_ACK_RCVD:
566 sp->lcp.state = LCP_STATE_OPENED;
567 sppp_ipcp_open (sp);
568 break;
569 case LCP_STATE_OPENED:
570 /* Remote magic changed -- close session. */
571 sp->lcp.state = LCP_STATE_CLOSED;
572 sp->ipcp.state = IPCP_STATE_CLOSED;
573 /* Initiate renegotiation. */
574 sppp_lcp_open (sp);
575 /* Send ACK after our REQ in attempt to break loop */
576 sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK,
577 h->ident, len-4, h+1);
578 sp->lcp.state = LCP_STATE_ACK_SENT;
579 break;
580 }
581 break;
582 case LCP_CONF_ACK:
583 if (h->ident != sp->lcp.confid)
584 break;
585 sppp_clear_timeout (sp);
586 if ((sp->pp_link_state != SPPP_LINK_UP) &&
587 (dev->flags & IFF_UP)) {
588 /* Coming out of loopback mode. */
589 sp->pp_link_state=SPPP_LINK_UP;
590 printk (KERN_INFO "%s: protocol up\n", dev->name);
591 }
592 switch (sp->lcp.state) {
593 case LCP_STATE_CLOSED:
594 sp->lcp.state = LCP_STATE_ACK_RCVD;
595 sppp_set_timeout (sp, 5);
596 break;
597 case LCP_STATE_ACK_SENT:
598 sp->lcp.state = LCP_STATE_OPENED;
599 sppp_ipcp_open (sp);
600 break;
601 }
602 break;
603 case LCP_CONF_NAK:
604 if (h->ident != sp->lcp.confid)
605 break;
606 p = (u8*) (h+1);
607 if (len>=10 && p[0] == LCP_OPT_MAGIC && p[1] >= 4) {
608 rmagic = (u32)p[2] << 24 |
609 (u32)p[3] << 16 | p[4] << 8 | p[5];
610 if (rmagic == ~sp->lcp.magic) {
611 int newmagic;
612 if (sp->pp_flags & PP_DEBUG)
613 printk (KERN_DEBUG "%s: conf nak: magic glitch\n",
614 dev->name);
615 get_random_bytes(&newmagic, sizeof(newmagic));
616 sp->lcp.magic += newmagic;
617 } else
618 sp->lcp.magic = rmagic;
619 }
620 if (sp->lcp.state != LCP_STATE_ACK_SENT) {
621 /* Go to closed state. */
622 sp->lcp.state = LCP_STATE_CLOSED;
623 sp->ipcp.state = IPCP_STATE_CLOSED;
624 }
625 /* The link will be renegotiated after timeout,
626 * to avoid endless req-nack loop. */
627 sppp_clear_timeout (sp);
628 sppp_set_timeout (sp, 2);
629 break;
630 case LCP_CONF_REJ:
631 if (h->ident != sp->lcp.confid)
632 break;
633 sppp_clear_timeout (sp);
634 /* Initiate renegotiation. */
635 sppp_lcp_open (sp);
636 if (sp->lcp.state != LCP_STATE_ACK_SENT) {
637 /* Go to closed state. */
638 sp->lcp.state = LCP_STATE_CLOSED;
639 sp->ipcp.state = IPCP_STATE_CLOSED;
640 }
641 break;
642 case LCP_TERM_REQ:
643 sppp_clear_timeout (sp);
644 /* Send Terminate-Ack packet. */
645 sppp_cp_send (sp, PPP_LCP, LCP_TERM_ACK, h->ident, 0, NULL);
646 /* Go to closed state. */
647 sp->lcp.state = LCP_STATE_CLOSED;
648 sp->ipcp.state = IPCP_STATE_CLOSED;
649 /* Initiate renegotiation. */
650 sppp_lcp_open (sp);
651 break;
652 case LCP_TERM_ACK:
653 case LCP_CODE_REJ:
654 case LCP_PROTO_REJ:
655 /* Ignore for now. */
656 break;
657 case LCP_DISC_REQ:
658 /* Discard the packet. */
659 break;
660 case LCP_ECHO_REQ:
661 if (sp->lcp.state != LCP_STATE_OPENED)
662 break;
663 if (len < 8) {
664 if (sp->pp_flags & PP_DEBUG)
665 printk (KERN_WARNING "%s: invalid lcp echo request packet length: %d bytes\n",
666 dev->name, len);
667 break;
668 }
669 if (ntohl (*(long*)(h+1)) == sp->lcp.magic) {
670 /* Line loopback mode detected. */
671 printk (KERN_WARNING "%s: loopback\n", dev->name);
672 if_down (dev);
673
674 /* Shut down the PPP link. */
675 sp->lcp.state = LCP_STATE_CLOSED;
676 sp->ipcp.state = IPCP_STATE_CLOSED;
677 sppp_clear_timeout (sp);
678 /* Initiate negotiation. */
679 sppp_lcp_open (sp);
680 break;
681 }
682 *(long*)(h+1) = htonl (sp->lcp.magic);
683 sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REPLY, h->ident, len-4, h+1);
684 break;
685 case LCP_ECHO_REPLY:
686 if (h->ident != sp->lcp.echoid)
687 break;
688 if (len < 8) {
689 if (sp->pp_flags & PP_DEBUG)
690 printk (KERN_WARNING "%s: invalid lcp echo reply packet length: %d bytes\n",
691 dev->name, len);
692 break;
693 }
694 if (ntohl (*(long*)(h+1)) != sp->lcp.magic)
695 sp->pp_alivecnt = 0;
696 break;
697 }
698}
699
700/*
701 * Handle incoming Cisco keepalive protocol packets.
702 */
703
704static void sppp_cisco_input (struct sppp *sp, struct sk_buff *skb)
705{
706 struct cisco_packet *h;
707 struct net_device *dev = sp->pp_if;
708
709 if (!pskb_may_pull(skb, sizeof(struct cisco_packet))
710 || (skb->len != CISCO_PACKET_LEN
711 && skb->len != CISCO_BIG_PACKET_LEN)) {
712 if (sp->pp_flags & PP_DEBUG)
713 printk (KERN_WARNING "%s: invalid cisco packet length: %d bytes\n",
714 dev->name, skb->len);
715 return;
716 }
717 h = (struct cisco_packet *)skb->data;
718 skb_pull(skb, sizeof(struct cisco_packet*));
719 if (sp->pp_flags & PP_DEBUG)
720 printk (KERN_WARNING "%s: cisco input: %d bytes <%xh %xh %xh %xh %xh-%xh>\n",
721 dev->name, skb->len,
722 ntohl (h->type), h->par1, h->par2, h->rel,
723 h->time0, h->time1);
724 switch (ntohl (h->type)) {
725 default:
726 if (sp->pp_flags & PP_DEBUG)
727 printk (KERN_WARNING "%s: unknown cisco packet type: 0x%x\n",
728 dev->name, ntohl (h->type));
729 break;
730 case CISCO_ADDR_REPLY:
731 /* Reply on address request, ignore */
732 break;
733 case CISCO_KEEPALIVE_REQ:
734 sp->pp_alivecnt = 0;
735 sp->pp_rseq = ntohl (h->par1);
736 if (sp->pp_seq == sp->pp_rseq) {
737 /* Local and remote sequence numbers are equal.
738 * Probably, the line is in loopback mode. */
739 int newseq;
740 if (sp->pp_loopcnt >= MAXALIVECNT) {
741 printk (KERN_WARNING "%s: loopback\n",
742 dev->name);
743 sp->pp_loopcnt = 0;
744 if (dev->flags & IFF_UP) {
745 if_down (dev);
746 }
747 }
748 ++sp->pp_loopcnt;
749
750 /* Generate new local sequence number */
751 get_random_bytes(&newseq, sizeof(newseq));
752 sp->pp_seq ^= newseq;
753 break;
754 }
755 sp->pp_loopcnt = 0;
756 if (sp->pp_link_state==SPPP_LINK_DOWN &&
757 (dev->flags & IFF_UP)) {
758 sp->pp_link_state=SPPP_LINK_UP;
759 printk (KERN_INFO "%s: protocol up\n", dev->name);
760 }
761 break;
762 case CISCO_ADDR_REQ:
763 /* Stolen from net/ipv4/devinet.c -- SIOCGIFADDR ioctl */
764 {
765 struct in_device *in_dev;
766 struct in_ifaddr *ifa;
767 u32 addr = 0, mask = ~0; /* FIXME: is the mask correct? */
768#ifdef CONFIG_INET
769 rcu_read_lock();
Herbert Xue5ed6392005-10-03 14:35:55 -0700770 if ((in_dev = __in_dev_get_rcu(dev)) != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 {
772 for (ifa=in_dev->ifa_list; ifa != NULL;
773 ifa=ifa->ifa_next) {
774 if (strcmp(dev->name, ifa->ifa_label) == 0)
775 {
776 addr = ifa->ifa_local;
777 mask = ifa->ifa_mask;
778 break;
779 }
780 }
781 }
782 rcu_read_unlock();
783#endif
784 /* I hope both addr and mask are in the net order */
785 sppp_cisco_send (sp, CISCO_ADDR_REPLY, addr, mask);
786 break;
787 }
788 }
789}
790
791
792/*
793 * Send PPP LCP packet.
794 */
795
796static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type,
797 u8 ident, u16 len, void *data)
798{
799 struct ppp_header *h;
800 struct lcp_header *lh;
801 struct sk_buff *skb;
802 struct net_device *dev = sp->pp_if;
803
804 skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+LCP_HEADER_LEN+len,
805 GFP_ATOMIC);
806 if (skb==NULL)
807 return;
808
809 skb_reserve(skb,dev->hard_header_len);
810
811 h = (struct ppp_header *)skb_put(skb, sizeof(struct ppp_header));
812 h->address = PPP_ALLSTATIONS; /* broadcast address */
813 h->control = PPP_UI; /* Unnumbered Info */
814 h->protocol = htons (proto); /* Link Control Protocol */
815
816 lh = (struct lcp_header *)skb_put(skb, sizeof(struct lcp_header));
817 lh->type = type;
818 lh->ident = ident;
819 lh->len = htons (LCP_HEADER_LEN + len);
820
821 if (len)
822 memcpy(skb_put(skb,len),data, len);
823
824 if (sp->pp_flags & PP_DEBUG) {
825 printk (KERN_WARNING "%s: %s output <%s id=%xh len=%xh",
826 dev->name,
827 proto==PPP_LCP ? "lcp" : "ipcp",
828 proto==PPP_LCP ? sppp_lcp_type_name (lh->type) :
829 sppp_ipcp_type_name (lh->type), lh->ident,
830 ntohs (lh->len));
831 if (len)
832 sppp_print_bytes ((u8*) (lh+1), len);
833 printk (">\n");
834 }
835 sp->obytes += skb->len;
836 /* Control is high priority so it doesn't get queued behind data */
837 skb->priority=TC_PRIO_CONTROL;
838 skb->dev = dev;
839 skb_queue_tail(&tx_queue, skb);
840}
841
842/*
843 * Send Cisco keepalive packet.
844 */
845
846static void sppp_cisco_send (struct sppp *sp, int type, long par1, long par2)
847{
848 struct ppp_header *h;
849 struct cisco_packet *ch;
850 struct sk_buff *skb;
851 struct net_device *dev = sp->pp_if;
852 u32 t = jiffies * 1000/HZ;
853
854 skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+CISCO_PACKET_LEN,
855 GFP_ATOMIC);
856
857 if(skb==NULL)
858 return;
859
860 skb_reserve(skb, dev->hard_header_len);
861 h = (struct ppp_header *)skb_put (skb, sizeof(struct ppp_header));
862 h->address = CISCO_MULTICAST;
863 h->control = 0;
864 h->protocol = htons (CISCO_KEEPALIVE);
865
866 ch = (struct cisco_packet*)skb_put(skb, CISCO_PACKET_LEN);
867 ch->type = htonl (type);
868 ch->par1 = htonl (par1);
869 ch->par2 = htonl (par2);
870 ch->rel = -1;
871 ch->time0 = htons ((u16) (t >> 16));
872 ch->time1 = htons ((u16) t);
873
874 if (sp->pp_flags & PP_DEBUG)
875 printk (KERN_WARNING "%s: cisco output: <%xh %xh %xh %xh %xh-%xh>\n",
876 dev->name, ntohl (ch->type), ch->par1,
877 ch->par2, ch->rel, ch->time0, ch->time1);
878 sp->obytes += skb->len;
879 skb->priority=TC_PRIO_CONTROL;
880 skb->dev = dev;
881 skb_queue_tail(&tx_queue, skb);
882}
883
884/**
885 * sppp_close - close down a synchronous PPP or Cisco HDLC link
886 * @dev: The network device to drop the link of
887 *
888 * This drops the logical interface to the channel. It is not
889 * done politely as we assume we will also be dropping DTR. Any
890 * timeouts are killed.
891 */
892
893int sppp_close (struct net_device *dev)
894{
895 struct sppp *sp = (struct sppp *)sppp_of(dev);
896 unsigned long flags;
897
898 spin_lock_irqsave(&sp->lock, flags);
899 sp->pp_link_state = SPPP_LINK_DOWN;
900 sp->lcp.state = LCP_STATE_CLOSED;
901 sp->ipcp.state = IPCP_STATE_CLOSED;
902 sppp_clear_timeout (sp);
903 spin_unlock_irqrestore(&sp->lock, flags);
904
905 return 0;
906}
907
908EXPORT_SYMBOL(sppp_close);
909
910/**
911 * sppp_open - open a synchronous PPP or Cisco HDLC link
912 * @dev: Network device to activate
913 *
914 * Close down any existing synchronous session and commence
915 * from scratch. In the PPP case this means negotiating LCP/IPCP
916 * and friends, while for Cisco HDLC we simply need to start sending
917 * keepalives
918 */
919
920int sppp_open (struct net_device *dev)
921{
922 struct sppp *sp = (struct sppp *)sppp_of(dev);
923 unsigned long flags;
924
925 sppp_close(dev);
926
927 spin_lock_irqsave(&sp->lock, flags);
928 if (!(sp->pp_flags & PP_CISCO)) {
929 sppp_lcp_open (sp);
930 }
931 sp->pp_link_state = SPPP_LINK_DOWN;
932 spin_unlock_irqrestore(&sp->lock, flags);
933 sppp_flush_xmit();
934
935 return 0;
936}
937
938EXPORT_SYMBOL(sppp_open);
939
940/**
941 * sppp_reopen - notify of physical link loss
942 * @dev: Device that lost the link
943 *
944 * This function informs the synchronous protocol code that
945 * the underlying link died (for example a carrier drop on X.21)
946 *
947 * We increment the magic numbers to ensure that if the other end
948 * failed to notice we will correctly start a new session. It happens
949 * do to the nature of telco circuits is that you can lose carrier on
950 * one endonly.
951 *
952 * Having done this we go back to negotiating. This function may
953 * be called from an interrupt context.
954 */
955
956int sppp_reopen (struct net_device *dev)
957{
958 struct sppp *sp = (struct sppp *)sppp_of(dev);
959 unsigned long flags;
960
961 sppp_close(dev);
962
963 spin_lock_irqsave(&sp->lock, flags);
964 if (!(sp->pp_flags & PP_CISCO))
965 {
966 sp->lcp.magic = jiffies;
967 ++sp->pp_seq;
968 sp->lcp.state = LCP_STATE_CLOSED;
969 sp->ipcp.state = IPCP_STATE_CLOSED;
970 /* Give it a moment for the line to settle then go */
971 sppp_set_timeout (sp, 1);
972 }
973 sp->pp_link_state=SPPP_LINK_DOWN;
974 spin_unlock_irqrestore(&sp->lock, flags);
975
976 return 0;
977}
978
979EXPORT_SYMBOL(sppp_reopen);
980
981/**
982 * sppp_change_mtu - Change the link MTU
983 * @dev: Device to change MTU on
984 * @new_mtu: New MTU
985 *
986 * Change the MTU on the link. This can only be called with
987 * the link down. It returns an error if the link is up or
988 * the mtu is out of range.
989 */
990
Adrian Bunk7665a082005-09-09 23:17:28 -0700991static int sppp_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992{
993 if(new_mtu<128||new_mtu>PPP_MTU||(dev->flags&IFF_UP))
994 return -EINVAL;
995 dev->mtu=new_mtu;
996 return 0;
997}
998
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999/**
1000 * sppp_do_ioctl - Ioctl handler for ppp/hdlc
1001 * @dev: Device subject to ioctl
1002 * @ifr: Interface request block from the user
1003 * @cmd: Command that is being issued
1004 *
1005 * This function handles the ioctls that may be issued by the user
1006 * to control the settings of a PPP/HDLC link. It does both busy
1007 * and security checks. This function is intended to be wrapped by
1008 * callers who wish to add additional ioctl calls of their own.
1009 */
1010
1011int sppp_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1012{
1013 struct sppp *sp = (struct sppp *)sppp_of(dev);
1014
1015 if(dev->flags&IFF_UP)
1016 return -EBUSY;
1017
1018 if(!capable(CAP_NET_ADMIN))
1019 return -EPERM;
1020
1021 switch(cmd)
1022 {
1023 case SPPPIOCCISCO:
1024 sp->pp_flags|=PP_CISCO;
1025 dev->type = ARPHRD_HDLC;
1026 break;
1027 case SPPPIOCPPP:
1028 sp->pp_flags&=~PP_CISCO;
1029 dev->type = ARPHRD_PPP;
1030 break;
1031 case SPPPIOCDEBUG:
1032 sp->pp_flags&=~PP_DEBUG;
1033 if(ifr->ifr_flags)
1034 sp->pp_flags|=PP_DEBUG;
1035 break;
1036 case SPPPIOCGFLAGS:
1037 if(copy_to_user(ifr->ifr_data, &sp->pp_flags, sizeof(sp->pp_flags)))
1038 return -EFAULT;
1039 break;
1040 case SPPPIOCSFLAGS:
1041 if(copy_from_user(&sp->pp_flags, ifr->ifr_data, sizeof(sp->pp_flags)))
1042 return -EFAULT;
1043 break;
1044 default:
1045 return -EINVAL;
1046 }
1047 return 0;
1048}
1049
1050EXPORT_SYMBOL(sppp_do_ioctl);
1051
1052/**
1053 * sppp_attach - attach synchronous PPP/HDLC to a device
1054 * @pd: PPP device to initialise
1055 *
1056 * This initialises the PPP/HDLC support on an interface. At the
1057 * time of calling the dev element must point to the network device
1058 * that this interface is attached to. The interface should not yet
1059 * be registered.
1060 */
1061
1062void sppp_attach(struct ppp_device *pd)
1063{
1064 struct net_device *dev = pd->dev;
1065 struct sppp *sp = &pd->sppp;
1066 unsigned long flags;
1067
1068 /* Make sure embedding is safe for sppp_of */
1069 BUG_ON(sppp_of(dev) != sp);
1070
1071 spin_lock_irqsave(&spppq_lock, flags);
1072 /* Initialize keepalive handler. */
1073 if (! spppq)
1074 {
1075 init_timer(&sppp_keepalive_timer);
1076 sppp_keepalive_timer.expires=jiffies+10*HZ;
1077 sppp_keepalive_timer.function=sppp_keepalive;
1078 add_timer(&sppp_keepalive_timer);
1079 }
1080 /* Insert new entry into the keepalive list. */
1081 sp->pp_next = spppq;
1082 spppq = sp;
1083 spin_unlock_irqrestore(&spppq_lock, flags);
1084
1085 sp->pp_loopcnt = 0;
1086 sp->pp_alivecnt = 0;
1087 sp->pp_seq = 0;
1088 sp->pp_rseq = 0;
1089 sp->pp_flags = PP_KEEPALIVE|PP_CISCO|debug;/*PP_DEBUG;*/
1090 sp->lcp.magic = 0;
1091 sp->lcp.state = LCP_STATE_CLOSED;
1092 sp->ipcp.state = IPCP_STATE_CLOSED;
1093 sp->pp_if = dev;
1094 spin_lock_init(&sp->lock);
1095
1096 /*
1097 * Device specific setup. All but interrupt handler and
1098 * hard_start_xmit.
1099 */
1100
1101 dev->hard_header = sppp_hard_header;
1102 dev->rebuild_header = sppp_rebuild_header;
1103 dev->tx_queue_len = 10;
1104 dev->type = ARPHRD_HDLC;
1105 dev->addr_len = 0;
1106 dev->hard_header_len = sizeof(struct ppp_header);
1107 dev->mtu = PPP_MTU;
1108 /*
1109 * These 4 are callers but MUST also call sppp_ functions
1110 */
1111 dev->do_ioctl = sppp_do_ioctl;
1112#if 0
1113 dev->get_stats = NULL; /* Let the driver override these */
1114 dev->open = sppp_open;
1115 dev->stop = sppp_close;
1116#endif
1117 dev->change_mtu = sppp_change_mtu;
1118 dev->hard_header_cache = NULL;
1119 dev->header_cache_update = NULL;
1120 dev->flags = IFF_MULTICAST|IFF_POINTOPOINT|IFF_NOARP;
1121}
1122
1123EXPORT_SYMBOL(sppp_attach);
1124
1125/**
1126 * sppp_detach - release PPP resources from a device
1127 * @dev: Network device to release
1128 *
1129 * Stop and free up any PPP/HDLC resources used by this
1130 * interface. This must be called before the device is
1131 * freed.
1132 */
1133
1134void sppp_detach (struct net_device *dev)
1135{
1136 struct sppp **q, *p, *sp = (struct sppp *)sppp_of(dev);
1137 unsigned long flags;
1138
1139 spin_lock_irqsave(&spppq_lock, flags);
1140 /* Remove the entry from the keepalive list. */
1141 for (q = &spppq; (p = *q); q = &p->pp_next)
1142 if (p == sp) {
1143 *q = p->pp_next;
1144 break;
1145 }
1146
1147 /* Stop keepalive handler. */
1148 if (! spppq)
1149 del_timer(&sppp_keepalive_timer);
1150 sppp_clear_timeout (sp);
1151 spin_unlock_irqrestore(&spppq_lock, flags);
1152}
1153
1154EXPORT_SYMBOL(sppp_detach);
1155
1156/*
1157 * Analyze the LCP Configure-Request options list
1158 * for the presence of unknown options.
1159 * If the request contains unknown options, build and
1160 * send Configure-reject packet, containing only unknown options.
1161 */
1162static int
1163sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h,
1164 int len, u32 *magic)
1165{
1166 u8 *buf, *r, *p;
1167 int rlen;
1168
1169 len -= 4;
1170 buf = r = kmalloc (len, GFP_ATOMIC);
1171 if (! buf)
1172 return (0);
1173
1174 p = (void*) (h+1);
1175 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
1176 switch (*p) {
1177 case LCP_OPT_MAGIC:
1178 /* Magic number -- extract. */
1179 if (len >= 6 && p[1] == 6) {
1180 *magic = (u32)p[2] << 24 |
1181 (u32)p[3] << 16 | p[4] << 8 | p[5];
1182 continue;
1183 }
1184 break;
1185 case LCP_OPT_ASYNC_MAP:
1186 /* Async control character map -- check to be zero. */
1187 if (len >= 6 && p[1] == 6 && ! p[2] && ! p[3] &&
1188 ! p[4] && ! p[5])
1189 continue;
1190 break;
1191 case LCP_OPT_MRU:
1192 /* Maximum receive unit -- always OK. */
1193 continue;
1194 default:
1195 /* Others not supported. */
1196 break;
1197 }
1198 /* Add the option to rejected list. */
1199 memcpy(r, p, p[1]);
1200 r += p[1];
1201 rlen += p[1];
1202 }
1203 if (rlen)
1204 sppp_cp_send (sp, PPP_LCP, LCP_CONF_REJ, h->ident, rlen, buf);
1205 kfree(buf);
1206 return (rlen == 0);
1207}
1208
1209static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *skb)
1210{
1211 struct lcp_header *h;
1212 struct net_device *dev = sp->pp_if;
1213 int len = skb->len;
1214
1215 if (!pskb_may_pull(skb, sizeof(struct lcp_header))) {
1216 if (sp->pp_flags & PP_DEBUG)
1217 printk (KERN_WARNING "%s: invalid ipcp packet length: %d bytes\n",
1218 dev->name, len);
1219 return;
1220 }
1221 h = (struct lcp_header *)skb->data;
1222 skb_pull(skb,sizeof(struct lcp_header));
1223 if (sp->pp_flags & PP_DEBUG) {
1224 printk (KERN_WARNING "%s: ipcp input: %d bytes <%s id=%xh len=%xh",
1225 dev->name, len,
1226 sppp_ipcp_type_name (h->type), h->ident, ntohs (h->len));
1227 if (len > 4)
1228 sppp_print_bytes ((u8*) (h+1), len-4);
1229 printk (">\n");
1230 }
1231 if (len > ntohs (h->len))
1232 len = ntohs (h->len);
1233 switch (h->type) {
1234 default:
1235 /* Unknown packet type -- send Code-Reject packet. */
1236 sppp_cp_send (sp, PPP_IPCP, IPCP_CODE_REJ, ++sp->pp_seq, len, h);
1237 break;
1238 case IPCP_CONF_REQ:
1239 if (len < 4) {
1240 if (sp->pp_flags & PP_DEBUG)
1241 printk (KERN_WARNING "%s: invalid ipcp configure request packet length: %d bytes\n",
1242 dev->name, len);
1243 return;
1244 }
1245 if (len > 4) {
1246 sppp_cp_send (sp, PPP_IPCP, LCP_CONF_REJ, h->ident,
1247 len-4, h+1);
1248
1249 switch (sp->ipcp.state) {
1250 case IPCP_STATE_OPENED:
1251 /* Initiate renegotiation. */
1252 sppp_ipcp_open (sp);
1253 /* fall through... */
1254 case IPCP_STATE_ACK_SENT:
1255 /* Go to closed state. */
1256 sp->ipcp.state = IPCP_STATE_CLOSED;
1257 }
1258 } else {
1259 /* Send Configure-Ack packet. */
1260 sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_ACK, h->ident,
1261 0, NULL);
1262 /* Change the state. */
1263 if (sp->ipcp.state == IPCP_STATE_ACK_RCVD)
1264 sp->ipcp.state = IPCP_STATE_OPENED;
1265 else
1266 sp->ipcp.state = IPCP_STATE_ACK_SENT;
1267 }
1268 break;
1269 case IPCP_CONF_ACK:
1270 if (h->ident != sp->ipcp.confid)
1271 break;
1272 sppp_clear_timeout (sp);
1273 switch (sp->ipcp.state) {
1274 case IPCP_STATE_CLOSED:
1275 sp->ipcp.state = IPCP_STATE_ACK_RCVD;
1276 sppp_set_timeout (sp, 5);
1277 break;
1278 case IPCP_STATE_ACK_SENT:
1279 sp->ipcp.state = IPCP_STATE_OPENED;
1280 break;
1281 }
1282 break;
1283 case IPCP_CONF_NAK:
1284 case IPCP_CONF_REJ:
1285 if (h->ident != sp->ipcp.confid)
1286 break;
1287 sppp_clear_timeout (sp);
1288 /* Initiate renegotiation. */
1289 sppp_ipcp_open (sp);
1290 if (sp->ipcp.state != IPCP_STATE_ACK_SENT)
1291 /* Go to closed state. */
1292 sp->ipcp.state = IPCP_STATE_CLOSED;
1293 break;
1294 case IPCP_TERM_REQ:
1295 /* Send Terminate-Ack packet. */
1296 sppp_cp_send (sp, PPP_IPCP, IPCP_TERM_ACK, h->ident, 0, NULL);
1297 /* Go to closed state. */
1298 sp->ipcp.state = IPCP_STATE_CLOSED;
1299 /* Initiate renegotiation. */
1300 sppp_ipcp_open (sp);
1301 break;
1302 case IPCP_TERM_ACK:
1303 /* Ignore for now. */
1304 case IPCP_CODE_REJ:
1305 /* Ignore for now. */
1306 break;
1307 }
1308}
1309
1310static void sppp_lcp_open (struct sppp *sp)
1311{
1312 char opt[6];
1313
1314 if (! sp->lcp.magic)
1315 sp->lcp.magic = jiffies;
1316 opt[0] = LCP_OPT_MAGIC;
1317 opt[1] = sizeof (opt);
1318 opt[2] = sp->lcp.magic >> 24;
1319 opt[3] = sp->lcp.magic >> 16;
1320 opt[4] = sp->lcp.magic >> 8;
1321 opt[5] = sp->lcp.magic;
1322 sp->lcp.confid = ++sp->pp_seq;
1323 sppp_cp_send (sp, PPP_LCP, LCP_CONF_REQ, sp->lcp.confid,
1324 sizeof (opt), &opt);
1325 sppp_set_timeout (sp, 2);
1326}
1327
1328static void sppp_ipcp_open (struct sppp *sp)
1329{
1330 sp->ipcp.confid = ++sp->pp_seq;
1331 sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_REQ, sp->ipcp.confid, 0, NULL);
1332 sppp_set_timeout (sp, 2);
1333}
1334
1335/*
1336 * Process PPP control protocol timeouts.
1337 */
1338
1339static void sppp_cp_timeout (unsigned long arg)
1340{
1341 struct sppp *sp = (struct sppp*) arg;
1342 unsigned long flags;
1343
1344 spin_lock_irqsave(&sp->lock, flags);
1345
1346 sp->pp_flags &= ~PP_TIMO;
1347 if (! (sp->pp_if->flags & IFF_UP) || (sp->pp_flags & PP_CISCO)) {
1348 spin_unlock_irqrestore(&sp->lock, flags);
1349 return;
1350 }
1351 switch (sp->lcp.state) {
1352 case LCP_STATE_CLOSED:
1353 /* No ACK for Configure-Request, retry. */
1354 sppp_lcp_open (sp);
1355 break;
1356 case LCP_STATE_ACK_RCVD:
1357 /* ACK got, but no Configure-Request for peer, retry. */
1358 sppp_lcp_open (sp);
1359 sp->lcp.state = LCP_STATE_CLOSED;
1360 break;
1361 case LCP_STATE_ACK_SENT:
1362 /* ACK sent but no ACK for Configure-Request, retry. */
1363 sppp_lcp_open (sp);
1364 break;
1365 case LCP_STATE_OPENED:
1366 /* LCP is already OK, try IPCP. */
1367 switch (sp->ipcp.state) {
1368 case IPCP_STATE_CLOSED:
1369 /* No ACK for Configure-Request, retry. */
1370 sppp_ipcp_open (sp);
1371 break;
1372 case IPCP_STATE_ACK_RCVD:
1373 /* ACK got, but no Configure-Request for peer, retry. */
1374 sppp_ipcp_open (sp);
1375 sp->ipcp.state = IPCP_STATE_CLOSED;
1376 break;
1377 case IPCP_STATE_ACK_SENT:
1378 /* ACK sent but no ACK for Configure-Request, retry. */
1379 sppp_ipcp_open (sp);
1380 break;
1381 case IPCP_STATE_OPENED:
1382 /* IPCP is OK. */
1383 break;
1384 }
1385 break;
1386 }
1387 spin_unlock_irqrestore(&sp->lock, flags);
1388 sppp_flush_xmit();
1389}
1390
1391static char *sppp_lcp_type_name (u8 type)
1392{
1393 static char buf [8];
1394 switch (type) {
1395 case LCP_CONF_REQ: return ("conf-req");
1396 case LCP_CONF_ACK: return ("conf-ack");
1397 case LCP_CONF_NAK: return ("conf-nack");
1398 case LCP_CONF_REJ: return ("conf-rej");
1399 case LCP_TERM_REQ: return ("term-req");
1400 case LCP_TERM_ACK: return ("term-ack");
1401 case LCP_CODE_REJ: return ("code-rej");
1402 case LCP_PROTO_REJ: return ("proto-rej");
1403 case LCP_ECHO_REQ: return ("echo-req");
1404 case LCP_ECHO_REPLY: return ("echo-reply");
1405 case LCP_DISC_REQ: return ("discard-req");
1406 }
1407 sprintf (buf, "%xh", type);
1408 return (buf);
1409}
1410
1411static char *sppp_ipcp_type_name (u8 type)
1412{
1413 static char buf [8];
1414 switch (type) {
1415 case IPCP_CONF_REQ: return ("conf-req");
1416 case IPCP_CONF_ACK: return ("conf-ack");
1417 case IPCP_CONF_NAK: return ("conf-nack");
1418 case IPCP_CONF_REJ: return ("conf-rej");
1419 case IPCP_TERM_REQ: return ("term-req");
1420 case IPCP_TERM_ACK: return ("term-ack");
1421 case IPCP_CODE_REJ: return ("code-rej");
1422 }
1423 sprintf (buf, "%xh", type);
1424 return (buf);
1425}
1426
1427static void sppp_print_bytes (u_char *p, u16 len)
1428{
1429 printk (" %x", *p++);
1430 while (--len > 0)
1431 printk ("-%x", *p++);
1432}
1433
1434/**
1435 * sppp_rcv - receive and process a WAN PPP frame
1436 * @skb: The buffer to process
1437 * @dev: The device it arrived on
1438 * @p: Unused
Jeff Garzik344baba2005-09-07 01:15:17 -04001439 * @orig_dev: Unused
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 *
1441 * Protocol glue. This drives the deferred processing mode the poorer
1442 * cards use. This can be called directly by cards that do not have
1443 * timing constraints but is normally called from the network layer
1444 * after interrupt servicing to process frames queued via netif_rx.
1445 */
1446
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001447static int sppp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *p, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448{
1449 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
1450 return NET_RX_DROP;
1451 sppp_input(dev,skb);
1452 return 0;
1453}
1454
Adrian Bunk7665a082005-09-09 23:17:28 -07001455static struct packet_type sppp_packet_type = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456 .type = __constant_htons(ETH_P_WAN_PPP),
1457 .func = sppp_rcv,
1458};
1459
1460static char banner[] __initdata =
1461 KERN_INFO "Cronyx Ltd, Synchronous PPP and CISCO HDLC (c) 1994\n"
1462 KERN_INFO "Linux port (c) 1998 Building Number Three Ltd & "
1463 "Jan \"Yenya\" Kasprzak.\n";
1464
1465static int __init sync_ppp_init(void)
1466{
1467 if(debug)
1468 debug=PP_DEBUG;
1469 printk(banner);
1470 skb_queue_head_init(&tx_queue);
1471 dev_add_pack(&sppp_packet_type);
1472 return 0;
1473}
1474
1475
1476static void __exit sync_ppp_cleanup(void)
1477{
1478 dev_remove_pack(&sppp_packet_type);
1479}
1480
1481module_init(sync_ppp_init);
1482module_exit(sync_ppp_cleanup);
1483module_param(debug, int, 0);
1484MODULE_LICENSE("GPL");
1485