kernel tree reorganization stage 1: Major cvs repository work (not logged as
[dragonfly.git] / sys / net / ppp / if_ppp.c
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1/*
2 * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver.
3 *
4 * Copyright (c) 1989 Carnegie Mellon University.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by Carnegie Mellon University. The name of the
13 * University may not be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18 *
19 * Drew D. Perkins
20 * Carnegie Mellon University
21 * 4910 Forbes Ave.
22 * Pittsburgh, PA 15213
23 * (412) 268-8576
24 * ddp@andrew.cmu.edu
25 *
26 * Based on:
27 * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89
28 *
29 * Copyright (c) 1987 Regents of the University of California.
30 * All rights reserved.
31 *
32 * Redistribution and use in source and binary forms are permitted
33 * provided that the above copyright notice and this paragraph are
34 * duplicated in all such forms and that any documentation,
35 * advertising materials, and other materials related to such
36 * distribution and use acknowledge that the software was developed
37 * by the University of California, Berkeley. The name of the
38 * University may not be used to endorse or promote products derived
39 * from this software without specific prior written permission.
40 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
41 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
42 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
43 *
44 * Serial Line interface
45 *
46 * Rick Adams
47 * Center for Seismic Studies
48 * 1300 N 17th Street, Suite 1450
49 * Arlington, Virginia 22209
50 * (703)276-7900
51 * rick@seismo.ARPA
52 * seismo!rick
53 *
54 * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).
55 * Converted to 4.3BSD Beta by Chris Torek.
56 * Other changes made at Berkeley, based in part on code by Kirk Smith.
57 *
58 * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com)
59 * Added VJ tcp header compression; more unified ioctls
60 *
61 * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au).
62 * Cleaned up a lot of the mbuf-related code to fix bugs that
63 * caused system crashes and packet corruption. Changed pppstart
64 * so that it doesn't just give up with a collision if the whole
65 * packet doesn't fit in the output ring buffer.
66 *
67 * Added priority queueing for interactive IP packets, following
68 * the model of if_sl.c, plus hooks for bpf.
69 * Paul Mackerras (paulus@cs.anu.edu.au).
70 */
71
72/* $FreeBSD: src/sys/net/if_ppp.c,v 1.67.2.4 2002/04/14 21:41:48 luigi Exp $ */
d2438d69 73/* $DragonFly: src/sys/net/ppp/if_ppp.c,v 1.7 2003/08/07 21:54:31 dillon Exp $ */
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74/* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
75/* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
76
1f2de5d4 77#include "use_ppp.h"
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78
79#include "opt_inet.h"
80#include "opt_ipx.h"
81#include "opt_ppp.h"
82
83#ifdef INET
84#define VJC
85#endif
86#define PPP_COMPRESS
87
88#include <sys/param.h>
89#include <sys/systm.h>
90#include <sys/proc.h>
91#include <sys/mbuf.h>
92#include <sys/socket.h>
93#include <sys/filio.h>
94#include <sys/sockio.h>
95#include <sys/kernel.h>
96#include <sys/time.h>
97#include <sys/malloc.h>
98
99#include <net/if.h>
100#include <net/if_types.h>
101#include <net/netisr.h>
102#include <net/bpf.h>
103
104#if INET
105#include <netinet/in.h>
106#include <netinet/in_systm.h>
107#include <netinet/in_var.h>
108#include <netinet/ip.h>
109#endif
110
111#if IPX
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112#include <netproto/ipx/ipx.h>
113#include <netproto/ipx/ipx_if.h>
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114#endif
115
116#ifdef VJC
117#include <net/slcompress.h>
118#endif
119
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120#include "if_ppp.h"
121#include "if_pppvar.h"
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122
123/* minimise diffs */
124#ifndef splsoftnet
125#define splsoftnet splnet
126#endif
127
128#ifdef PPP_COMPRESS
129#define PACKETPTR struct mbuf *
1f2de5d4 130#include <net/ppp_layer/ppp_comp.h>
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131#endif
132
133struct ppp_softc ppp_softc[NPPP];
134
135/* XXX layering violation */
136extern void pppasyncattach __P((void *));
137
138static void pppattach __P((void *));
139PSEUDO_SET(pppattach, if_ppp);
140
141static int pppsioctl __P((struct ifnet *ifp, u_long cmd, caddr_t data));
142static void pppintr __P((void));
143
144static void ppp_requeue __P((struct ppp_softc *));
145static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd));
146static void ppp_ccp_closed __P((struct ppp_softc *));
147static void ppp_inproc __P((struct ppp_softc *, struct mbuf *));
148static void pppdumpm __P((struct mbuf *m0));
149
150/*
151 * Some useful mbuf macros not in mbuf.h.
152 */
153#define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
154
155#define M_DATASTART(m) \
156 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
157 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
158
159#define M_DATASIZE(m) \
160 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
161 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
162
163/*
164 * We steal two bits in the mbuf m_flags, to mark high-priority packets
165 * for output, and received packets following lost/corrupted packets.
166 */
167#define M_HIGHPRI 0x2000 /* output packet for sc_fastq */
168#define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */
169
170
171#ifdef PPP_COMPRESS
172/*
173 * List of compressors we know about.
174 * We leave some space so maybe we can modload compressors.
175 */
176
177extern struct compressor ppp_bsd_compress;
178extern struct compressor ppp_deflate, ppp_deflate_draft;
179
180static struct compressor *ppp_compressors[8] = {
181#if DO_BSD_COMPRESS && defined(PPP_BSDCOMP)
182 &ppp_bsd_compress,
183#endif
184#if DO_DEFLATE && defined(PPP_DEFLATE)
185 &ppp_deflate,
186 &ppp_deflate_draft,
187#endif
188 NULL
189};
190#endif /* PPP_COMPRESS */
191
192/*
193 * Called from boot code to establish ppp interfaces.
194 */
195static void
196pppattach(dummy)
197 void *dummy;
198{
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199 struct ppp_softc *sc;
200 int i = 0;
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201
202 for (sc = ppp_softc; i < NPPP; sc++) {
203 sc->sc_if.if_name = "ppp";
204 sc->sc_if.if_unit = i++;
205 sc->sc_if.if_mtu = PPP_MTU;
206 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
207 sc->sc_if.if_type = IFT_PPP;
208 sc->sc_if.if_hdrlen = PPP_HDRLEN;
209 sc->sc_if.if_ioctl = pppsioctl;
210 sc->sc_if.if_output = pppoutput;
211 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
212 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
213 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
214 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN;
215 if_attach(&sc->sc_if);
216 bpfattach(&sc->sc_if, DLT_PPP, PPP_HDRLEN);
217 }
218 register_netisr(NETISR_PPP, pppintr);
219 /*
220 * XXX layering violation - if_ppp can work over any lower level
221 * transport that cares to attach to it.
222 */
223 pppasyncattach(dummy);
224}
225
226/*
227 * Allocate a ppp interface unit and initialize it.
228 */
229struct ppp_softc *
dadab5e9 230pppalloc(struct thread *td)
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231{
232 int nppp, i;
233 struct ppp_softc *sc;
234
235 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
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236 if (sc->sc_xfer == td) {
237 sc->sc_xfer = NULL;
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238 return sc;
239 }
240 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
241 if (sc->sc_devp == NULL)
242 break;
243 if (nppp >= NPPP)
244 return NULL;
245
246 sc->sc_flags = 0;
247 sc->sc_mru = PPP_MRU;
248 sc->sc_relinq = NULL;
249 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats));
250#ifdef VJC
251 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress),
252 M_DEVBUF, M_NOWAIT);
253 if (sc->sc_comp)
254 sl_compress_init(sc->sc_comp, -1);
255#endif
256#ifdef PPP_COMPRESS
257 sc->sc_xc_state = NULL;
258 sc->sc_rc_state = NULL;
259#endif /* PPP_COMPRESS */
260 for (i = 0; i < NUM_NP; ++i)
261 sc->sc_npmode[i] = NPMODE_ERROR;
262 sc->sc_npqueue = NULL;
263 sc->sc_npqtail = &sc->sc_npqueue;
264 sc->sc_last_sent = sc->sc_last_recv = time_second;
265
266 return sc;
267}
268
269/*
270 * Deallocate a ppp unit. Must be called at splsoftnet or higher.
271 */
272void
273pppdealloc(sc)
274 struct ppp_softc *sc;
275{
276 struct mbuf *m;
277
278 if_down(&sc->sc_if);
279 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
280 getmicrotime(&sc->sc_if.if_lastchange);
281 sc->sc_devp = NULL;
dadab5e9 282 sc->sc_xfer = NULL;
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283 for (;;) {
284 IF_DEQUEUE(&sc->sc_rawq, m);
285 if (m == NULL)
286 break;
287 m_freem(m);
288 }
289 for (;;) {
290 IF_DEQUEUE(&sc->sc_inq, m);
291 if (m == NULL)
292 break;
293 m_freem(m);
294 }
295 for (;;) {
296 IF_DEQUEUE(&sc->sc_fastq, m);
297 if (m == NULL)
298 break;
299 m_freem(m);
300 }
301 while ((m = sc->sc_npqueue) != NULL) {
302 sc->sc_npqueue = m->m_nextpkt;
303 m_freem(m);
304 }
305#ifdef PPP_COMPRESS
306 ppp_ccp_closed(sc);
307 sc->sc_xc_state = NULL;
308 sc->sc_rc_state = NULL;
309#endif /* PPP_COMPRESS */
310#ifdef PPP_FILTER
311 if (sc->sc_pass_filt.bf_insns != 0) {
312 free(sc->sc_pass_filt.bf_insns, M_DEVBUF);
313 sc->sc_pass_filt.bf_insns = 0;
314 sc->sc_pass_filt.bf_len = 0;
315 }
316 if (sc->sc_active_filt.bf_insns != 0) {
317 free(sc->sc_active_filt.bf_insns, M_DEVBUF);
318 sc->sc_active_filt.bf_insns = 0;
319 sc->sc_active_filt.bf_len = 0;
320 }
321#endif /* PPP_FILTER */
322#ifdef VJC
323 if (sc->sc_comp != 0) {
324 free(sc->sc_comp, M_DEVBUF);
325 sc->sc_comp = 0;
326 }
327#endif
328}
329
330/*
331 * Ioctl routine for generic ppp devices.
332 */
333int
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334pppioctl(struct ppp_softc *sc, u_long cmd, caddr_t data,
335 int flag, struct thread *td)
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336{
337 int s, error, flags, mru, npx;
338 u_int nb;
339 struct ppp_option_data *odp;
340 struct compressor **cp;
341 struct npioctl *npi;
342 time_t t;
343#ifdef PPP_FILTER
344 struct bpf_program *bp, *nbp;
345 struct bpf_insn *newcode, *oldcode;
346 int newcodelen;
347#endif /* PPP_FILTER */
348#ifdef PPP_COMPRESS
349 u_char ccp_option[CCP_MAX_OPTION_LENGTH];
350#endif
351
352 switch (cmd) {
353 case FIONREAD:
354 *(int *)data = sc->sc_inq.ifq_len;
355 break;
356
357 case PPPIOCGUNIT:
358 *(int *)data = sc->sc_if.if_unit;
359 break;
360
361 case PPPIOCGFLAGS:
362 *(u_int *)data = sc->sc_flags;
363 break;
364
365 case PPPIOCSFLAGS:
dadab5e9 366 if ((error = suser(td)) != 0)
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367 return (error);
368 flags = *(int *)data & SC_MASK;
369 s = splsoftnet();
370#ifdef PPP_COMPRESS
371 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
372 ppp_ccp_closed(sc);
373#endif
374 splimp();
375 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
376 splx(s);
377 break;
378
379 case PPPIOCSMRU:
dadab5e9 380 if ((error = suser(td)) != 0)
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381 return (error);
382 mru = *(int *)data;
383 if (mru >= PPP_MRU && mru <= PPP_MAXMRU)
384 sc->sc_mru = mru;
385 break;
386
387 case PPPIOCGMRU:
388 *(int *)data = sc->sc_mru;
389 break;
390
391#ifdef VJC
392 case PPPIOCSMAXCID:
dadab5e9 393 if ((error = suser(td)) != 0)
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394 return (error);
395 if (sc->sc_comp) {
396 s = splsoftnet();
397 sl_compress_init(sc->sc_comp, *(int *)data);
398 splx(s);
399 }
400 break;
401#endif
402
403 case PPPIOCXFERUNIT:
dadab5e9 404 if ((error = suser(td)) != 0)
984263bc 405 return (error);
dadab5e9 406 sc->sc_xfer = td;
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407 break;
408
409#ifdef PPP_COMPRESS
410 case PPPIOCSCOMPRESS:
dadab5e9 411 if ((error = suser(td)) != 0)
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412 return (error);
413 odp = (struct ppp_option_data *) data;
414 nb = odp->length;
415 if (nb > sizeof(ccp_option))
416 nb = sizeof(ccp_option);
417 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0)
418 return (error);
419 if (ccp_option[1] < 2) /* preliminary check on the length byte */
420 return (EINVAL);
421 for (cp = ppp_compressors; *cp != NULL; ++cp)
422 if ((*cp)->compress_proto == ccp_option[0]) {
423 /*
424 * Found a handler for the protocol - try to allocate
425 * a compressor or decompressor.
426 */
427 error = 0;
428 if (odp->transmit) {
429 s = splsoftnet();
430 if (sc->sc_xc_state != NULL)
431 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
432 sc->sc_xcomp = *cp;
433 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb);
434 if (sc->sc_xc_state == NULL) {
435 if (sc->sc_flags & SC_DEBUG)
436 printf("ppp%d: comp_alloc failed\n",
437 sc->sc_if.if_unit);
438 error = ENOBUFS;
439 }
440 splimp();
441 sc->sc_flags &= ~SC_COMP_RUN;
442 splx(s);
443 } else {
444 s = splsoftnet();
445 if (sc->sc_rc_state != NULL)
446 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
447 sc->sc_rcomp = *cp;
448 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb);
449 if (sc->sc_rc_state == NULL) {
450 if (sc->sc_flags & SC_DEBUG)
451 printf("ppp%d: decomp_alloc failed\n",
452 sc->sc_if.if_unit);
453 error = ENOBUFS;
454 }
455 splimp();
456 sc->sc_flags &= ~SC_DECOMP_RUN;
457 splx(s);
458 }
459 return (error);
460 }
461 if (sc->sc_flags & SC_DEBUG)
462 printf("ppp%d: no compressor for [%x %x %x], %x\n",
463 sc->sc_if.if_unit, ccp_option[0], ccp_option[1],
464 ccp_option[2], nb);
465 return (EINVAL); /* no handler found */
466#endif /* PPP_COMPRESS */
467
468 case PPPIOCGNPMODE:
469 case PPPIOCSNPMODE:
470 npi = (struct npioctl *) data;
471 switch (npi->protocol) {
472 case PPP_IP:
473 npx = NP_IP;
474 break;
475 default:
476 return EINVAL;
477 }
478 if (cmd == PPPIOCGNPMODE) {
479 npi->mode = sc->sc_npmode[npx];
480 } else {
dadab5e9 481 if ((error = suser(td)) != 0)
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482 return (error);
483 if (npi->mode != sc->sc_npmode[npx]) {
484 s = splsoftnet();
485 sc->sc_npmode[npx] = npi->mode;
486 if (npi->mode != NPMODE_QUEUE) {
487 ppp_requeue(sc);
488 (*sc->sc_start)(sc);
489 }
490 splx(s);
491 }
492 }
493 break;
494
495 case PPPIOCGIDLE:
496 s = splsoftnet();
497 t = time_second;
498 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent;
499 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv;
500 splx(s);
501 break;
502
503#ifdef PPP_FILTER
504 case PPPIOCSPASS:
505 case PPPIOCSACTIVE:
506 nbp = (struct bpf_program *) data;
507 if ((unsigned) nbp->bf_len > BPF_MAXINSNS)
508 return EINVAL;
509 newcodelen = nbp->bf_len * sizeof(struct bpf_insn);
510 if (newcodelen != 0) {
511 MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK);
512 if (newcode == 0) {
513 return EINVAL; /* or sumpin */
514 }
515 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode,
516 newcodelen)) != 0) {
517 free(newcode, M_DEVBUF);
518 return error;
519 }
520 if (!bpf_validate(newcode, nbp->bf_len)) {
521 free(newcode, M_DEVBUF);
522 return EINVAL;
523 }
524 } else
525 newcode = 0;
526 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt;
527 oldcode = bp->bf_insns;
528 s = splimp();
529 bp->bf_len = nbp->bf_len;
530 bp->bf_insns = newcode;
531 splx(s);
532 if (oldcode != 0)
533 free(oldcode, M_DEVBUF);
534 break;
535#endif
536
537 default:
538 return (ENOIOCTL);
539 }
540 return (0);
541}
542
543/*
544 * Process an ioctl request to the ppp network interface.
545 */
546static int
547pppsioctl(ifp, cmd, data)
dadab5e9 548 struct ifnet *ifp;
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549 u_long cmd;
550 caddr_t data;
551{
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552 struct thread *td = curthread; /* XXX */
553 struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
554 struct ifaddr *ifa = (struct ifaddr *)data;
555 struct ifreq *ifr = (struct ifreq *)data;
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556 struct ppp_stats *psp;
557#ifdef PPP_COMPRESS
558 struct ppp_comp_stats *pcp;
559#endif
560 int s = splimp(), error = 0;
561
562 switch (cmd) {
563 case SIOCSIFFLAGS:
564 if ((ifp->if_flags & IFF_RUNNING) == 0)
565 ifp->if_flags &= ~IFF_UP;
566 break;
567
568 case SIOCSIFADDR:
569 case SIOCAIFADDR:
570 switch(ifa->ifa_addr->sa_family) {
571#ifdef INET
572 case AF_INET:
573 break;
574#endif
575#ifdef IPX
576 case AF_IPX:
577 break;
578#endif
579 default:
580 error = EAFNOSUPPORT;
581 break;
582 }
583 break;
584
585 case SIOCSIFDSTADDR:
586 switch(ifa->ifa_addr->sa_family) {
587#ifdef INET
588 case AF_INET:
589 break;
590#endif
591#ifdef IPX
592 case AF_IPX:
593 break;
594#endif
595 default:
596 error = EAFNOSUPPORT;
597 break;
598 }
599 break;
600
601 case SIOCSIFMTU:
dadab5e9 602 if ((error = suser(td)) != 0)
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603 break;
604 if (ifr->ifr_mtu > PPP_MAXMTU)
605 error = EINVAL;
606 else {
607 sc->sc_if.if_mtu = ifr->ifr_mtu;
608 if (sc->sc_setmtu)
609 (*sc->sc_setmtu)(sc);
610 }
611 break;
612
613 case SIOCGIFMTU:
614 ifr->ifr_mtu = sc->sc_if.if_mtu;
615 break;
616
617 case SIOCADDMULTI:
618 case SIOCDELMULTI:
619 if (ifr == 0) {
620 error = EAFNOSUPPORT;
621 break;
622 }
623 switch(ifr->ifr_addr.sa_family) {
624#ifdef INET
625 case AF_INET:
626 break;
627#endif
628 default:
629 error = EAFNOSUPPORT;
630 break;
631 }
632 break;
633
634 case SIOCGPPPSTATS:
635 psp = &((struct ifpppstatsreq *) data)->stats;
636 bzero(psp, sizeof(*psp));
637 psp->p = sc->sc_stats;
638#if defined(VJC) && !defined(SL_NO_STATS)
639 if (sc->sc_comp) {
640 psp->vj.vjs_packets = sc->sc_comp->sls_packets;
641 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed;
642 psp->vj.vjs_searches = sc->sc_comp->sls_searches;
643 psp->vj.vjs_misses = sc->sc_comp->sls_misses;
644 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin;
645 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin;
646 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin;
647 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed;
648 }
649#endif /* VJC */
650 break;
651
652#ifdef PPP_COMPRESS
653 case SIOCGPPPCSTATS:
654 pcp = &((struct ifpppcstatsreq *) data)->stats;
655 bzero(pcp, sizeof(*pcp));
656 if (sc->sc_xc_state != NULL)
657 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c);
658 if (sc->sc_rc_state != NULL)
659 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d);
660 break;
661#endif /* PPP_COMPRESS */
662
663 default:
664 error = ENOTTY;
665 }
666 splx(s);
667 return (error);
668}
669
670/*
671 * Queue a packet. Start transmission if not active.
672 * Packet is placed in Information field of PPP frame.
673 * Called at splnet as the if->if_output handler.
674 * Called at splnet from pppwrite().
675 */
676int
677pppoutput(ifp, m0, dst, rtp)
678 struct ifnet *ifp;
679 struct mbuf *m0;
680 struct sockaddr *dst;
681 struct rtentry *rtp;
682{
82ed7fc2 683 struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
984263bc
MD
684 int protocol, address, control;
685 u_char *cp;
686 int s, error;
687 struct ip *ip;
688 struct ifqueue *ifq;
689 enum NPmode mode;
690 int len;
691 struct mbuf *m;
692
693 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
694 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) {
695 error = ENETDOWN; /* sort of */
696 goto bad;
697 }
698
699 /*
700 * Compute PPP header.
701 */
702 m0->m_flags &= ~M_HIGHPRI;
703 switch (dst->sa_family) {
704#ifdef INET
705 case AF_INET:
706 address = PPP_ALLSTATIONS;
707 control = PPP_UI;
708 protocol = PPP_IP;
709 mode = sc->sc_npmode[NP_IP];
710
711 /*
712 * If this packet has the "low delay" bit set in the IP header,
713 * put it on the fastq instead.
714 */
715 ip = mtod(m0, struct ip *);
716 if (ip->ip_tos & IPTOS_LOWDELAY)
717 m0->m_flags |= M_HIGHPRI;
718 break;
719#endif
720#ifdef IPX
721 case AF_IPX:
722 /*
723 * This is pretty bogus.. We dont have an ipxcp module in pppd
724 * yet to configure the link parameters. Sigh. I guess a
725 * manual ifconfig would do.... -Peter
726 */
727 address = PPP_ALLSTATIONS;
728 control = PPP_UI;
729 protocol = PPP_IPX;
730 mode = NPMODE_PASS;
731 break;
732#endif
733 case AF_UNSPEC:
734 address = PPP_ADDRESS(dst->sa_data);
735 control = PPP_CONTROL(dst->sa_data);
736 protocol = PPP_PROTOCOL(dst->sa_data);
737 mode = NPMODE_PASS;
738 break;
739 default:
740 printf("ppp%d: af%d not supported\n", ifp->if_unit, dst->sa_family);
741 error = EAFNOSUPPORT;
742 goto bad;
743 }
744
745 /*
746 * Drop this packet, or return an error, if necessary.
747 */
748 if (mode == NPMODE_ERROR) {
749 error = ENETDOWN;
750 goto bad;
751 }
752 if (mode == NPMODE_DROP) {
753 error = 0;
754 goto bad;
755 }
756
757 /*
758 * Add PPP header. If no space in first mbuf, allocate another.
759 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.)
760 */
761 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) {
762 m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT);
763 if (m0 == 0) {
764 error = ENOBUFS;
765 goto bad;
766 }
767 m0->m_len = 0;
768 } else
769 m0->m_data -= PPP_HDRLEN;
770
771 cp = mtod(m0, u_char *);
772 *cp++ = address;
773 *cp++ = control;
774 *cp++ = protocol >> 8;
775 *cp++ = protocol & 0xff;
776 m0->m_len += PPP_HDRLEN;
777
778 len = 0;
779 for (m = m0; m != 0; m = m->m_next)
780 len += m->m_len;
781
782 if (sc->sc_flags & SC_LOG_OUTPKT) {
783 printf("ppp%d output: ", ifp->if_unit);
784 pppdumpm(m0);
785 }
786
787 if ((protocol & 0x8000) == 0) {
788#ifdef PPP_FILTER
789 /*
790 * Apply the pass and active filters to the packet,
791 * but only if it is a data packet.
792 */
793 *mtod(m0, u_char *) = 1; /* indicates outbound */
794 if (sc->sc_pass_filt.bf_insns != 0
795 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0,
796 len, 0) == 0) {
797 error = 0; /* drop this packet */
798 goto bad;
799 }
800
801 /*
802 * Update the time we sent the most recent packet.
803 */
804 if (sc->sc_active_filt.bf_insns == 0
805 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0))
806 sc->sc_last_sent = time_second;
807
808 *mtod(m0, u_char *) = address;
809#else
810 /*
811 * Update the time we sent the most recent data packet.
812 */
813 sc->sc_last_sent = time_second;
814#endif /* PPP_FILTER */
815 }
816
817 /*
818 * See if bpf wants to look at the packet.
819 */
820 if (ifp->if_bpf)
821 bpf_mtap(ifp, m0);
822
823 /*
824 * Put the packet on the appropriate queue.
825 */
826 s = splsoftnet(); /* redundant */
827 if (mode == NPMODE_QUEUE) {
828 /* XXX we should limit the number of packets on this queue */
829 *sc->sc_npqtail = m0;
830 m0->m_nextpkt = NULL;
831 sc->sc_npqtail = &m0->m_nextpkt;
832 } else {
833 /* fastq and if_snd are emptied at spl[soft]net now */
834 ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd;
835 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) {
836 IF_DROP(ifq);
837 splx(s);
838 sc->sc_if.if_oerrors++;
839 sc->sc_stats.ppp_oerrors++;
840 error = ENOBUFS;
841 goto bad;
842 }
843 IF_ENQUEUE(ifq, m0);
844 (*sc->sc_start)(sc);
845 }
846 getmicrotime(&ifp->if_lastchange);
847 ifp->if_opackets++;
848 ifp->if_obytes += len;
849
850 splx(s);
851 return (0);
852
853bad:
854 m_freem(m0);
855 return (error);
856}
857
858/*
859 * After a change in the NPmode for some NP, move packets from the
860 * npqueue to the send queue or the fast queue as appropriate.
861 * Should be called at spl[soft]net.
862 */
863static void
864ppp_requeue(sc)
865 struct ppp_softc *sc;
866{
867 struct mbuf *m, **mpp;
868 struct ifqueue *ifq;
869 enum NPmode mode;
870
871 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) {
872 switch (PPP_PROTOCOL(mtod(m, u_char *))) {
873 case PPP_IP:
874 mode = sc->sc_npmode[NP_IP];
875 break;
876 default:
877 mode = NPMODE_PASS;
878 }
879
880 switch (mode) {
881 case NPMODE_PASS:
882 /*
883 * This packet can now go on one of the queues to be sent.
884 */
885 *mpp = m->m_nextpkt;
886 m->m_nextpkt = NULL;
887 ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: &sc->sc_if.if_snd;
888 if (IF_QFULL(ifq)) {
889 IF_DROP(ifq);
890 sc->sc_if.if_oerrors++;
891 sc->sc_stats.ppp_oerrors++;
892 } else
893 IF_ENQUEUE(ifq, m);
894 break;
895
896 case NPMODE_DROP:
897 case NPMODE_ERROR:
898 *mpp = m->m_nextpkt;
899 m_freem(m);
900 break;
901
902 case NPMODE_QUEUE:
903 mpp = &m->m_nextpkt;
904 break;
905 }
906 }
907 sc->sc_npqtail = mpp;
908}
909
910/*
911 * Transmitter has finished outputting some stuff;
912 * remember to call sc->sc_start later at splsoftnet.
913 */
914void
915ppp_restart(sc)
916 struct ppp_softc *sc;
917{
918 int s = splimp();
919
920 sc->sc_flags &= ~SC_TBUSY;
921 schednetisr(NETISR_PPP);
922 splx(s);
923}
924
925
926/*
927 * Get a packet to send. This procedure is intended to be called at
928 * splsoftnet, since it may involve time-consuming operations such as
929 * applying VJ compression, packet compression, address/control and/or
930 * protocol field compression to the packet.
931 */
932struct mbuf *
933ppp_dequeue(sc)
934 struct ppp_softc *sc;
935{
936 struct mbuf *m, *mp;
937 u_char *cp;
938 int address, control, protocol;
939
940 /*
941 * Grab a packet to send: first try the fast queue, then the
942 * normal queue.
943 */
944 IF_DEQUEUE(&sc->sc_fastq, m);
945 if (m == NULL)
946 IF_DEQUEUE(&sc->sc_if.if_snd, m);
947 if (m == NULL)
948 return NULL;
949
950 ++sc->sc_stats.ppp_opackets;
951
952 /*
953 * Extract the ppp header of the new packet.
954 * The ppp header will be in one mbuf.
955 */
956 cp = mtod(m, u_char *);
957 address = PPP_ADDRESS(cp);
958 control = PPP_CONTROL(cp);
959 protocol = PPP_PROTOCOL(cp);
960
961 switch (protocol) {
962 case PPP_IP:
963#ifdef VJC
964 /*
965 * If the packet is a TCP/IP packet, see if we can compress it.
966 */
967 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
968 struct ip *ip;
969 int type;
970
971 mp = m;
972 ip = (struct ip *) (cp + PPP_HDRLEN);
973 if (mp->m_len <= PPP_HDRLEN) {
974 mp = mp->m_next;
975 if (mp == NULL)
976 break;
977 ip = mtod(mp, struct ip *);
978 }
979 /* this code assumes the IP/TCP header is in one non-shared mbuf */
980 if (ip->ip_p == IPPROTO_TCP) {
981 type = sl_compress_tcp(mp, ip, sc->sc_comp,
982 !(sc->sc_flags & SC_NO_TCP_CCID));
983 switch (type) {
984 case TYPE_UNCOMPRESSED_TCP:
985 protocol = PPP_VJC_UNCOMP;
986 break;
987 case TYPE_COMPRESSED_TCP:
988 protocol = PPP_VJC_COMP;
989 cp = mtod(m, u_char *);
990 cp[0] = address; /* header has moved */
991 cp[1] = control;
992 cp[2] = 0;
993 break;
994 }
995 cp[3] = protocol; /* update protocol in PPP header */
996 }
997 }
998#endif /* VJC */
999 break;
1000
1001#ifdef PPP_COMPRESS
1002 case PPP_CCP:
1003 ppp_ccp(sc, m, 0);
1004 break;
1005#endif /* PPP_COMPRESS */
1006 }
1007
1008#ifdef PPP_COMPRESS
1009 if (protocol != PPP_LCP && protocol != PPP_CCP
1010 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
1011 struct mbuf *mcomp = NULL;
1012 int slen, clen;
1013
1014 slen = 0;
1015 for (mp = m; mp != NULL; mp = mp->m_next)
1016 slen += mp->m_len;
1017 clen = (*sc->sc_xcomp->compress)
1018 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN);
1019 if (mcomp != NULL) {
1020 if (sc->sc_flags & SC_CCP_UP) {
1021 /* Send the compressed packet instead of the original. */
1022 m_freem(m);
1023 m = mcomp;
1024 cp = mtod(m, u_char *);
1025 protocol = cp[3];
1026 } else {
1027 /* Can't transmit compressed packets until CCP is up. */
1028 m_freem(mcomp);
1029 }
1030 }
1031 }
1032#endif /* PPP_COMPRESS */
1033
1034 /*
1035 * Compress the address/control and protocol, if possible.
1036 */
1037 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
1038 control == PPP_UI && protocol != PPP_ALLSTATIONS &&
1039 protocol != PPP_LCP) {
1040 /* can compress address/control */
1041 m->m_data += 2;
1042 m->m_len -= 2;
1043 }
1044 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
1045 /* can compress protocol */
1046 if (mtod(m, u_char *) == cp) {
1047 cp[2] = cp[1]; /* move address/control up */
1048 cp[1] = cp[0];
1049 }
1050 ++m->m_data;
1051 --m->m_len;
1052 }
1053
1054 return m;
1055}
1056
1057/*
1058 * Software interrupt routine, called at spl[soft]net.
1059 */
1060static void
1061pppintr()
1062{
1063 struct ppp_softc *sc;
1064 int i, s;
1065 struct mbuf *m;
1066
1067 sc = ppp_softc;
1068 for (i = 0; i < NPPP; ++i, ++sc) {
1069 s = splimp();
1070 if (!(sc->sc_flags & SC_TBUSY)
1071 && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) {
1072 sc->sc_flags |= SC_TBUSY;
1073 splx(s);
1074 (*sc->sc_start)(sc);
1075 } else
1076 splx(s);
1077 for (;;) {
1078 s = splimp();
1079 IF_DEQUEUE(&sc->sc_rawq, m);
1080 splx(s);
1081 if (m == NULL)
1082 break;
1083 ppp_inproc(sc, m);
1084 }
1085 }
1086}
1087
1088#ifdef PPP_COMPRESS
1089/*
1090 * Handle a CCP packet. `rcvd' is 1 if the packet was received,
1091 * 0 if it is about to be transmitted.
1092 */
1093static void
1094ppp_ccp(sc, m, rcvd)
1095 struct ppp_softc *sc;
1096 struct mbuf *m;
1097 int rcvd;
1098{
1099 u_char *dp, *ep;
1100 struct mbuf *mp;
1101 int slen, s;
1102
1103 /*
1104 * Get a pointer to the data after the PPP header.
1105 */
1106 if (m->m_len <= PPP_HDRLEN) {
1107 mp = m->m_next;
1108 if (mp == NULL)
1109 return;
1110 dp = (mp != NULL)? mtod(mp, u_char *): NULL;
1111 } else {
1112 mp = m;
1113 dp = mtod(mp, u_char *) + PPP_HDRLEN;
1114 }
1115
1116 ep = mtod(mp, u_char *) + mp->m_len;
1117 if (dp + CCP_HDRLEN > ep)
1118 return;
1119 slen = CCP_LENGTH(dp);
1120 if (dp + slen > ep) {
1121 if (sc->sc_flags & SC_DEBUG)
1122 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n",
1123 dp, slen, mtod(mp, u_char *), mp->m_len);
1124 return;
1125 }
1126
1127 switch (CCP_CODE(dp)) {
1128 case CCP_CONFREQ:
1129 case CCP_TERMREQ:
1130 case CCP_TERMACK:
1131 /* CCP must be going down - disable compression */
1132 if (sc->sc_flags & SC_CCP_UP) {
1133 s = splimp();
1134 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
1135 splx(s);
1136 }
1137 break;
1138
1139 case CCP_CONFACK:
1140 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP)
1141 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN
1142 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) {
1143 if (!rcvd) {
1144 /* we're agreeing to send compressed packets. */
1145 if (sc->sc_xc_state != NULL
1146 && (*sc->sc_xcomp->comp_init)
1147 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1148 sc->sc_if.if_unit, 0, sc->sc_flags & SC_DEBUG)) {
1149 s = splimp();
1150 sc->sc_flags |= SC_COMP_RUN;
1151 splx(s);
1152 }
1153 } else {
1154 /* peer is agreeing to send compressed packets. */
1155 if (sc->sc_rc_state != NULL
1156 && (*sc->sc_rcomp->decomp_init)
1157 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1158 sc->sc_if.if_unit, 0, sc->sc_mru,
1159 sc->sc_flags & SC_DEBUG)) {
1160 s = splimp();
1161 sc->sc_flags |= SC_DECOMP_RUN;
1162 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
1163 splx(s);
1164 }
1165 }
1166 }
1167 break;
1168
1169 case CCP_RESETACK:
1170 if (sc->sc_flags & SC_CCP_UP) {
1171 if (!rcvd) {
1172 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN))
1173 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state);
1174 } else {
1175 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1176 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state);
1177 s = splimp();
1178 sc->sc_flags &= ~SC_DC_ERROR;
1179 splx(s);
1180 }
1181 }
1182 }
1183 break;
1184 }
1185}
1186
1187/*
1188 * CCP is down; free (de)compressor state if necessary.
1189 */
1190static void
1191ppp_ccp_closed(sc)
1192 struct ppp_softc *sc;
1193{
1194 if (sc->sc_xc_state) {
1195 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
1196 sc->sc_xc_state = NULL;
1197 }
1198 if (sc->sc_rc_state) {
1199 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
1200 sc->sc_rc_state = NULL;
1201 }
1202}
1203#endif /* PPP_COMPRESS */
1204
1205/*
1206 * PPP packet input routine.
1207 * The caller has checked and removed the FCS and has inserted
1208 * the address/control bytes and the protocol high byte if they
1209 * were omitted.
1210 */
1211void
1212ppppktin(sc, m, lost)
1213 struct ppp_softc *sc;
1214 struct mbuf *m;
1215 int lost;
1216{
1217 int s = splimp();
1218
1219 if (lost)
1220 m->m_flags |= M_ERRMARK;
1221 IF_ENQUEUE(&sc->sc_rawq, m);
1222 schednetisr(NETISR_PPP);
1223 splx(s);
1224}
1225
1226/*
1227 * Process a received PPP packet, doing decompression as necessary.
1228 * Should be called at splsoftnet.
1229 */
1230#define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
1231 TYPE_UNCOMPRESSED_TCP)
1232
1233static void
1234ppp_inproc(sc, m)
1235 struct ppp_softc *sc;
1236 struct mbuf *m;
1237{
1238 struct ifnet *ifp = &sc->sc_if;
1239 struct ifqueue *inq;
1240 int s, ilen = 0, xlen, proto, rv;
1241 u_char *cp, adrs, ctrl;
1242 struct mbuf *mp, *dmp = NULL;
1243 u_char *iphdr;
1244 u_int hlen;
1245
1246 sc->sc_stats.ppp_ipackets++;
1247
1248 if (sc->sc_flags & SC_LOG_INPKT) {
1249 ilen = 0;
1250 for (mp = m; mp != NULL; mp = mp->m_next)
1251 ilen += mp->m_len;
1252 printf("ppp%d: got %d bytes\n", ifp->if_unit, ilen);
1253 pppdumpm(m);
1254 }
1255
1256 cp = mtod(m, u_char *);
1257 adrs = PPP_ADDRESS(cp);
1258 ctrl = PPP_CONTROL(cp);
1259 proto = PPP_PROTOCOL(cp);
1260
1261 if (m->m_flags & M_ERRMARK) {
1262 m->m_flags &= ~M_ERRMARK;
1263 s = splimp();
1264 sc->sc_flags |= SC_VJ_RESET;
1265 splx(s);
1266 }
1267
1268#ifdef PPP_COMPRESS
1269 /*
1270 * Decompress this packet if necessary, update the receiver's
1271 * dictionary, or take appropriate action on a CCP packet.
1272 */
1273 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)
1274 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) {
1275 /* decompress this packet */
1276 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp);
1277 if (rv == DECOMP_OK) {
1278 m_freem(m);
1279 if (dmp == NULL) {
1280 /* no error, but no decompressed packet produced */
1281 return;
1282 }
1283 m = dmp;
1284 cp = mtod(m, u_char *);
1285 proto = PPP_PROTOCOL(cp);
1286
1287 } else {
1288 /*
1289 * An error has occurred in decompression.
1290 * Pass the compressed packet up to pppd, which may take
1291 * CCP down or issue a Reset-Req.
1292 */
1293 if (sc->sc_flags & SC_DEBUG)
1294 printf("ppp%d: decompress failed %d\n", ifp->if_unit, rv);
1295 s = splimp();
1296 sc->sc_flags |= SC_VJ_RESET;
1297 if (rv == DECOMP_ERROR)
1298 sc->sc_flags |= SC_DC_ERROR;
1299 else
1300 sc->sc_flags |= SC_DC_FERROR;
1301 splx(s);
1302 }
1303
1304 } else {
1305 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1306 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m);
1307 }
1308 if (proto == PPP_CCP) {
1309 ppp_ccp(sc, m, 1);
1310 }
1311 }
1312#endif
1313
1314 ilen = 0;
1315 for (mp = m; mp != NULL; mp = mp->m_next)
1316 ilen += mp->m_len;
1317
1318#ifdef VJC
1319 if (sc->sc_flags & SC_VJ_RESET) {
1320 /*
1321 * If we've missed a packet, we must toss subsequent compressed
1322 * packets which don't have an explicit connection ID.
1323 */
1324 if (sc->sc_comp)
1325 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp);
1326 s = splimp();
1327 sc->sc_flags &= ~SC_VJ_RESET;
1328 splx(s);
1329 }
1330
1331 /*
1332 * See if we have a VJ-compressed packet to uncompress.
1333 */
1334 if (proto == PPP_VJC_COMP) {
1335 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1336 goto bad;
1337
1338 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1339 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP,
1340 sc->sc_comp, &iphdr, &hlen);
1341
1342 if (xlen <= 0) {
1343 if (sc->sc_flags & SC_DEBUG)
1344 printf("ppp%d: VJ uncompress failed on type comp\n",
1345 ifp->if_unit);
1346 goto bad;
1347 }
1348
1349 /* Copy the PPP and IP headers into a new mbuf. */
1350 MGETHDR(mp, M_DONTWAIT, MT_DATA);
1351 if (mp == NULL)
1352 goto bad;
1353 mp->m_len = 0;
1354 mp->m_next = NULL;
1355 if (hlen + PPP_HDRLEN > MHLEN) {
1356 MCLGET(mp, M_DONTWAIT);
1357 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) {
1358 m_freem(mp);
1359 goto bad; /* lose if big headers and no clusters */
1360 }
1361 }
1362 cp = mtod(mp, u_char *);
1363 cp[0] = adrs;
1364 cp[1] = ctrl;
1365 cp[2] = 0;
1366 cp[3] = PPP_IP;
1367 proto = PPP_IP;
1368 bcopy(iphdr, cp + PPP_HDRLEN, hlen);
1369 mp->m_len = hlen + PPP_HDRLEN;
1370
1371 /*
1372 * Trim the PPP and VJ headers off the old mbuf
1373 * and stick the new and old mbufs together.
1374 */
1375 m->m_data += PPP_HDRLEN + xlen;
1376 m->m_len -= PPP_HDRLEN + xlen;
1377 if (m->m_len <= M_TRAILINGSPACE(mp)) {
1378 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len);
1379 mp->m_len += m->m_len;
1380 mp->m_next = m_free(m);
1381 } else {
1382 mp->m_next = m;
1383 }
1384 m = mp;
1385 ilen += hlen - xlen;
1386
1387 } else if (proto == PPP_VJC_UNCOMP) {
1388 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1389 goto bad;
1390
1391 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1392 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP,
1393 sc->sc_comp, &iphdr, &hlen);
1394
1395 if (xlen < 0) {
1396 if (sc->sc_flags & SC_DEBUG)
1397 printf("ppp%d: VJ uncompress failed on type uncomp\n",
1398 ifp->if_unit);
1399 goto bad;
1400 }
1401
1402 proto = PPP_IP;
1403 cp[3] = PPP_IP;
1404 }
1405#endif /* VJC */
1406
1407 /*
1408 * If the packet will fit in a header mbuf, don't waste a
1409 * whole cluster on it.
1410 */
1411 if (ilen <= MHLEN && M_IS_CLUSTER(m)) {
1412 MGETHDR(mp, M_DONTWAIT, MT_DATA);
1413 if (mp != NULL) {
1414 m_copydata(m, 0, ilen, mtod(mp, caddr_t));
1415 m_freem(m);
1416 m = mp;
1417 m->m_len = ilen;
1418 }
1419 }
1420 m->m_pkthdr.len = ilen;
1421 m->m_pkthdr.rcvif = ifp;
1422
1423 if ((proto & 0x8000) == 0) {
1424#ifdef PPP_FILTER
1425 /*
1426 * See whether we want to pass this packet, and
1427 * if it counts as link activity.
1428 */
1429 adrs = *mtod(m, u_char *); /* save address field */
1430 *mtod(m, u_char *) = 0; /* indicate inbound */
1431 if (sc->sc_pass_filt.bf_insns != 0
1432 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m,
1433 ilen, 0) == 0) {
1434 /* drop this packet */
1435 m_freem(m);
1436 return;
1437 }
1438 if (sc->sc_active_filt.bf_insns == 0
1439 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0))
1440 sc->sc_last_recv = time_second;
1441
1442 *mtod(m, u_char *) = adrs;
1443#else
1444 /*
1445 * Record the time that we received this packet.
1446 */
1447 sc->sc_last_recv = time_second;
1448#endif /* PPP_FILTER */
1449 }
1450
1451 /* See if bpf wants to look at the packet. */
1452 if (sc->sc_if.if_bpf)
1453 bpf_mtap(&sc->sc_if, m);
1454
1455 rv = 0;
1456 switch (proto) {
1457#ifdef INET
1458 case PPP_IP:
1459 /*
1460 * IP packet - take off the ppp header and pass it up to IP.
1461 */
1462 if ((ifp->if_flags & IFF_UP) == 0
1463 || sc->sc_npmode[NP_IP] != NPMODE_PASS) {
1464 /* interface is down - drop the packet. */
1465 m_freem(m);
1466 return;
1467 }
1468 m->m_pkthdr.len -= PPP_HDRLEN;
1469 m->m_data += PPP_HDRLEN;
1470 m->m_len -= PPP_HDRLEN;
1471 if (ipflow_fastforward(m))
1472 return;
1473 schednetisr(NETISR_IP);
1474 inq = &ipintrq;
1475 break;
1476#endif
1477#ifdef IPX
1478 case PPP_IPX:
1479 /*
1480 * IPX packet - take off the ppp header and pass it up to IPX.
1481 */
1482 if ((sc->sc_if.if_flags & IFF_UP) == 0
1483 /* XXX: || sc->sc_npmode[NP_IPX] != NPMODE_PASS*/) {
1484 /* interface is down - drop the packet. */
1485 m_freem(m);
1486 return;
1487 }
1488 m->m_pkthdr.len -= PPP_HDRLEN;
1489 m->m_data += PPP_HDRLEN;
1490 m->m_len -= PPP_HDRLEN;
1491 schednetisr(NETISR_IPX);
1492 inq = &ipxintrq;
1493 sc->sc_last_recv = time_second; /* update time of last pkt rcvd */
1494 break;
1495#endif
1496
1497 default:
1498 /*
1499 * Some other protocol - place on input queue for read().
1500 */
1501 inq = &sc->sc_inq;
1502 rv = 1;
1503 break;
1504 }
1505
1506 /*
1507 * Put the packet on the appropriate input queue.
1508 */
1509 s = splimp();
1510 if (IF_QFULL(inq)) {
1511 IF_DROP(inq);
1512 splx(s);
1513 if (sc->sc_flags & SC_DEBUG)
1514 printf("ppp%d: input queue full\n", ifp->if_unit);
1515 ifp->if_iqdrops++;
1516 goto bad;
1517 }
1518 IF_ENQUEUE(inq, m);
1519 splx(s);
1520 ifp->if_ipackets++;
1521 ifp->if_ibytes += ilen;
1522 getmicrotime(&ifp->if_lastchange);
1523
1524 if (rv)
1525 (*sc->sc_ctlp)(sc);
1526
1527 return;
1528
1529 bad:
1530 m_freem(m);
1531 sc->sc_if.if_ierrors++;
1532 sc->sc_stats.ppp_ierrors++;
1533}
1534
1535#define MAX_DUMP_BYTES 128
1536
1537static void
1538pppdumpm(m0)
1539 struct mbuf *m0;
1540{
1541 char buf[3*MAX_DUMP_BYTES+4];
1542 char *bp = buf;
1543 struct mbuf *m;
1544
1545 for (m = m0; m; m = m->m_next) {
1546 int l = m->m_len;
1547 u_char *rptr = (u_char *)m->m_data;
1548
1549 while (l--) {
1550 if (bp > buf + sizeof(buf) - 4)
1551 goto done;
1552 *bp++ = hex2ascii(*rptr >> 4);
1553 *bp++ = hex2ascii(*rptr++ & 0xf);
1554 }
1555
1556 if (m->m_next) {
1557 if (bp > buf + sizeof(buf) - 3)
1558 goto done;
1559 *bp++ = '|';
1560 } else
1561 *bp++ = ' ';
1562 }
1563done:
1564 if (m)
1565 *bp++ = '>';
1566 *bp = 0;
1567 printf("%s\n", buf);
1568}