1 /* $NetBSD: if_ppp.c,v 1.173 2024/07/05 04:31:53 rin Exp $ */
2 /* Id: if_ppp.c,v 1.6 1997/03/04 03:33:00 paulus Exp */
3
4 /*
5 * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver.
6 *
7 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The name "Carnegie Mellon University" must not be used to
22 * endorse or promote products derived from this software without
23 * prior written permission. For permission or any legal
24 * details, please contact
25 * Office of Technology Transfer
26 * Carnegie Mellon University
27 * 5000 Forbes Avenue
28 * Pittsburgh, PA 15213-3890
29 * (412) 268-4387, fax: (412) 268-7395
30 * tech-transfer@andrew.cmu.edu
31 *
32 * 4. Redistributions of any form whatsoever must retain the following
33 * acknowledgment:
34 * "This product includes software developed by Computing Services
35 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
36 *
37 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
38 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
39 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
40 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
41 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
42 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
43 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
44 *
45 * Based on:
46 * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89
47 *
48 * Copyright (c) 1987 Regents of the University of California.
49 * All rights reserved.
50 *
51 * Redistribution and use in source and binary forms are permitted
52 * provided that the above copyright notice and this paragraph are
53 * duplicated in all such forms and that any documentation,
54 * advertising materials, and other materials related to such
55 * distribution and use acknowledge that the software was developed
56 * by the University of California, Berkeley. The name of the
57 * University may not be used to endorse or promote products derived
58 * from this software without specific prior written permission.
59 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
60 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
61 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
62 *
63 * Serial Line interface
64 *
65 * Rick Adams
66 * Center for Seismic Studies
67 * 1300 N 17th Street, Suite 1450
68 * Arlington, Virginia 22209
69 * (703)276-7900
70 * rick@seismo.ARPA
71 * seismo!rick
72 *
73 * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).
74 * Converted to 4.3BSD Beta by Chris Torek.
75 * Other changes made at Berkeley, based in part on code by Kirk Smith.
76 *
77 * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com)
78 * Added VJ tcp header compression; more unified ioctls
79 *
80 * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au).
81 * Cleaned up a lot of the mbuf-related code to fix bugs that
82 * caused system crashes and packet corruption. Changed pppstart
83 * so that it doesn't just give up with a collision if the whole
84 * packet doesn't fit in the output ring buffer.
85 *
86 * Added priority queueing for interactive IP packets, following
87 * the model of if_sl.c, plus hooks for bpf.
88 * Paul Mackerras (paulus@cs.anu.edu.au).
89 */
90
91 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
92 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
93
94 /*
95 * XXX IMP ME HARDER
96 *
97 * This is an explanation of that comment. This code used to use
98 * splimp() to block both network and tty interrupts. However,
99 * that call is deprecated. So, we have replaced the uses of
100 * splimp() with splhigh() in order to applomplish what it needs
101 * to accomplish, and added that happy little comment.
102 */
103
104 #include <sys/cdefs.h>
105 __KERNEL_RCSID(0, "$NetBSD: if_ppp.c,v 1.173 2024/07/05 04:31:53 rin Exp $");
106
107 #ifdef _KERNEL_OPT
108 #include "ppp.h"
109 #include "opt_inet.h"
110 #include "opt_gateway.h"
111 #include "opt_ppp.h"
112 #endif
113
114 #ifdef INET
115 #define VJC
116 #endif
117 #define PPP_COMPRESS
118
119 #include <sys/param.h>
120 #include <sys/proc.h>
121 #include <sys/mbuf.h>
122 #include <sys/socket.h>
123 #include <sys/ioctl.h>
124 #include <sys/kernel.h>
125 #include <sys/systm.h>
126 #include <sys/time.h>
127 #include <sys/malloc.h>
128 #include <sys/module.h>
129 #include <sys/mutex.h>
130 #include <sys/once.h>
131 #include <sys/conf.h>
132 #include <sys/kauth.h>
133 #include <sys/intr.h>
134 #include <sys/socketvar.h>
135 #include <sys/device.h>
136 #include <sys/module.h>
137
138 #include <net/if.h>
139 #include <net/if_types.h>
140 #include <net/route.h>
141
142 #include <netinet/in.h>
143 #include <netinet/in_systm.h>
144 #include <netinet/in_var.h>
145 #ifdef INET
146 #include <netinet/ip.h>
147 #endif
148
149 #include <net/bpf.h>
150 #include <net/slip.h>
151
152 #ifdef VJC
153 #include <net/slcompress.h>
154 #endif
155
156 #include <net/ppp_defs.h>
157 #include <net/if_ppp.h>
158 #include <net/if_pppvar.h>
159 #include <sys/cpu.h>
160
161 #ifdef PPP_COMPRESS
162 #define PACKETPTR struct mbuf *
163 #include <net/ppp-comp.h>
164 #endif
165
166 #include "ioconf.h"
167
168 static int pppsioctl(struct ifnet *, u_long, void *);
169 static void ppp_requeue(struct ppp_softc *);
170 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd);
171 static void ppp_ccp_closed(struct ppp_softc *);
172 static void ppp_inproc(struct ppp_softc *, struct mbuf *);
173 static void pppdumpm(struct mbuf *m0);
174 #ifdef ALTQ
175 static void ppp_ifstart(struct ifnet *ifp);
176 #endif
177
178 static void pppintr(void *);
179
180 extern struct linesw ppp_disc;
181
182 /*
183 * We define two link layer specific mbuf flags, to mark high-priority
184 * packets for output, and received packets following lost/corrupted
185 * packets.
186 */
187 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */
188 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */
189
190 static int ppp_clone_create(struct if_clone *, int);
191 static int ppp_clone_destroy(struct ifnet *);
192
193 static struct ppp_softc *ppp_create(const char *, int);
194
195 static struct {
196 LIST_HEAD(ppp_sclist, ppp_softc) list;
197 kmutex_t lock;
198 } ppp_softcs __cacheline_aligned;
199
200 struct if_clone ppp_cloner =
201 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy);
202
203 #ifdef PPP_COMPRESS
204 static LIST_HEAD(, compressor) ppp_compressors = { NULL };
205 static kmutex_t ppp_compressors_mtx;
206
207 static int ppp_compressor_init(void);
208 static int ppp_compressor_destroy(void);
209 static struct compressor *ppp_get_compressor(uint8_t);
210 static void ppp_compressor_rele(struct compressor *);
211 #endif /* PPP_COMPRESS */
212
213
214 /*
215 * Called from boot code to establish ppp interfaces.
216 */
217 void
pppattach(int n __unused)218 pppattach(int n __unused)
219 {
220
221 /*
222 * Nothing to do here, initialization is handled by the
223 * module initialization code in pppinit() below).
224 */
225 }
226
227 static void
pppinit(void)228 pppinit(void)
229 {
230 /* Init the compressor sub-sub-system */
231 ppp_compressor_init();
232
233 if (ttyldisc_attach(&ppp_disc) != 0)
234 panic("%s", __func__);
235
236 mutex_init(&ppp_softcs.lock, MUTEX_DEFAULT, IPL_NONE);
237 LIST_INIT(&ppp_softcs.list);
238 if_clone_attach(&ppp_cloner);
239 }
240
241 static int
pppdetach(void)242 pppdetach(void)
243 {
244 int error = 0;
245
246 if (!LIST_EMPTY(&ppp_softcs.list))
247 error = EBUSY;
248
249 if (error == 0)
250 error = ttyldisc_detach(&ppp_disc);
251
252 if (error == 0) {
253 mutex_destroy(&ppp_softcs.lock);
254 if_clone_detach(&ppp_cloner);
255 ppp_compressor_destroy();
256 }
257
258 return error;
259 }
260
261 static struct ppp_softc *
ppp_create(const char * name,int unit)262 ppp_create(const char *name, int unit)
263 {
264 struct ppp_softc *sc, *sci, *scl = NULL;
265
266 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO);
267
268 mutex_enter(&ppp_softcs.lock);
269 if (unit == -1) {
270 int i = 0;
271 LIST_FOREACH(sci, &ppp_softcs.list, sc_iflist) {
272 scl = sci;
273 if (i < sci->sc_unit) {
274 unit = i;
275 break;
276 } else {
277 #ifdef DIAGNOSTIC
278 KASSERT(i == sci->sc_unit);
279 #endif
280 i++;
281 }
282 }
283 if (unit == -1)
284 unit = i;
285 } else {
286 LIST_FOREACH(sci, &ppp_softcs.list, sc_iflist) {
287 scl = sci;
288 if (unit < sci->sc_unit)
289 break;
290 else if (unit == sci->sc_unit) {
291 free(sc, M_DEVBUF);
292 mutex_exit(&ppp_softcs.lock);
293 return NULL;
294 }
295 }
296 }
297
298 if (sci != NULL)
299 LIST_INSERT_BEFORE(sci, sc, sc_iflist);
300 else if (scl != NULL)
301 LIST_INSERT_AFTER(scl, sc, sc_iflist);
302 else
303 LIST_INSERT_HEAD(&ppp_softcs.list, sc, sc_iflist);
304
305 mutex_exit(&ppp_softcs.lock);
306
307 if_initname(&sc->sc_if, name, sc->sc_unit = unit);
308 callout_init(&sc->sc_timo_ch, 0);
309 sc->sc_if.if_softc = sc;
310 sc->sc_if.if_mtu = PPP_MTU;
311 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
312 sc->sc_if.if_type = IFT_PPP;
313 sc->sc_if.if_hdrlen = PPP_HDRLEN;
314 sc->sc_if.if_dlt = DLT_NULL;
315 sc->sc_if.if_ioctl = pppsioctl;
316 sc->sc_if.if_output = pppoutput;
317 #ifdef ALTQ
318 sc->sc_if.if_start = ppp_ifstart;
319 #endif
320 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN);
321 IFQ_SET_MAXLEN(&sc->sc_inq, IFQ_MAXLEN);
322 IFQ_SET_MAXLEN(&sc->sc_fastq, IFQ_MAXLEN);
323 IFQ_SET_MAXLEN(&sc->sc_rawq, IFQ_MAXLEN);
324
325 IFQ_LOCK_INIT(&sc->sc_fastq);
326
327 /* Ratio of 1:2 packets between the regular and the fast queue */
328 sc->sc_maxfastq = 2;
329 IFQ_SET_READY(&sc->sc_if.if_snd);
330 if_attach(&sc->sc_if);
331 if_alloc_sadl(&sc->sc_if);
332 bpf_attach(&sc->sc_if, DLT_NULL, 0);
333 return sc;
334 }
335
336 static int
ppp_clone_create(struct if_clone * ifc,int unit)337 ppp_clone_create(struct if_clone *ifc, int unit)
338 {
339 return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0;
340 }
341
342 static int
ppp_clone_destroy(struct ifnet * ifp)343 ppp_clone_destroy(struct ifnet *ifp)
344 {
345 struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc;
346
347 if (sc->sc_devp != NULL)
348 return EBUSY; /* Not removing it */
349
350 mutex_enter(&ppp_softcs.lock);
351 LIST_REMOVE(sc, sc_iflist);
352 mutex_exit(&ppp_softcs.lock);
353
354 bpf_detach(ifp);
355 if_detach(ifp);
356
357 IFQ_LOCK_DESTROY(&sc->sc_fastq);
358
359 free(sc, M_DEVBUF);
360 return 0;
361 }
362
363 /*
364 * Allocate a ppp interface unit and initialize it.
365 */
366 struct ppp_softc *
pppalloc(pid_t pid)367 pppalloc(pid_t pid)
368 {
369 struct ppp_softc *sc = NULL, *scf;
370 int i;
371
372 mutex_enter(&ppp_softcs.lock);
373 LIST_FOREACH(scf, &ppp_softcs.list, sc_iflist) {
374 if (scf->sc_xfer == pid) {
375 scf->sc_xfer = 0;
376 mutex_exit(&ppp_softcs.lock);
377 return scf;
378 }
379 if (scf->sc_devp == NULL && sc == NULL)
380 sc = scf;
381 }
382 mutex_exit(&ppp_softcs.lock);
383
384 if (sc == NULL)
385 sc = ppp_create(ppp_cloner.ifc_name, -1);
386
387 sc->sc_si = softint_establish(SOFTINT_NET, pppintr, sc);
388 if (sc->sc_si == NULL) {
389 printf("%s: unable to establish softintr\n",
390 sc->sc_if.if_xname);
391 return NULL;
392 }
393 sc->sc_flags = 0;
394 sc->sc_mru = PPP_MRU;
395 sc->sc_relinq = NULL;
396 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats));
397 #ifdef VJC
398 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT);
399 if (sc->sc_comp)
400 sl_compress_init(sc->sc_comp);
401 #endif
402 #ifdef PPP_COMPRESS
403 sc->sc_xc_state = NULL;
404 sc->sc_rc_state = NULL;
405 #endif /* PPP_COMPRESS */
406 for (i = 0; i < NUM_NP; ++i)
407 sc->sc_npmode[i] = NPMODE_ERROR;
408 sc->sc_npqueue = NULL;
409 sc->sc_npqtail = &sc->sc_npqueue;
410 sc->sc_last_sent = sc->sc_last_recv = time_second;
411
412 return sc;
413 }
414
415 /*
416 * Deallocate a ppp unit. Must be called at splsoftnet or higher.
417 */
418 void
pppdealloc(struct ppp_softc * sc)419 pppdealloc(struct ppp_softc *sc)
420 {
421 struct mbuf *m;
422
423 softint_disestablish(sc->sc_si);
424 if_down(&sc->sc_if);
425 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
426 sc->sc_devp = NULL;
427 sc->sc_xfer = 0;
428 for (;;) {
429 IF_DEQUEUE(&sc->sc_rawq, m);
430 if (m == NULL)
431 break;
432 m_freem(m);
433 }
434 for (;;) {
435 IF_DEQUEUE(&sc->sc_inq, m);
436 if (m == NULL)
437 break;
438 m_freem(m);
439 }
440 for (;;) {
441 IF_DEQUEUE(&sc->sc_fastq, m);
442 if (m == NULL)
443 break;
444 m_freem(m);
445 }
446 while ((m = sc->sc_npqueue) != NULL) {
447 sc->sc_npqueue = m->m_nextpkt;
448 m_freem(m);
449 }
450 m_freem(sc->sc_togo);
451 sc->sc_togo = NULL;
452 #ifdef PPP_COMPRESS
453 ppp_ccp_closed(sc);
454 sc->sc_xc_state = NULL;
455 sc->sc_rc_state = NULL;
456 #endif /* PPP_COMPRESS */
457 #ifdef PPP_FILTER
458 if (sc->sc_pass_filt_in.bf_insns != 0) {
459 free(sc->sc_pass_filt_in.bf_insns, M_DEVBUF);
460 sc->sc_pass_filt_in.bf_insns = 0;
461 sc->sc_pass_filt_in.bf_len = 0;
462 }
463 if (sc->sc_pass_filt_out.bf_insns != 0) {
464 free(sc->sc_pass_filt_out.bf_insns, M_DEVBUF);
465 sc->sc_pass_filt_out.bf_insns = 0;
466 sc->sc_pass_filt_out.bf_len = 0;
467 }
468 if (sc->sc_active_filt_in.bf_insns != 0) {
469 free(sc->sc_active_filt_in.bf_insns, M_DEVBUF);
470 sc->sc_active_filt_in.bf_insns = 0;
471 sc->sc_active_filt_in.bf_len = 0;
472 }
473 if (sc->sc_active_filt_out.bf_insns != 0) {
474 free(sc->sc_active_filt_out.bf_insns, M_DEVBUF);
475 sc->sc_active_filt_out.bf_insns = 0;
476 sc->sc_active_filt_out.bf_len = 0;
477 }
478 #endif /* PPP_FILTER */
479 #ifdef VJC
480 if (sc->sc_comp != 0) {
481 free(sc->sc_comp, M_DEVBUF);
482 sc->sc_comp = 0;
483 }
484 #endif
485 (void)ppp_clone_destroy(&sc->sc_if);
486 }
487
488 /*
489 * Ioctl routine for generic ppp devices.
490 */
491 int
pppioctl(struct ppp_softc * sc,u_long cmd,void * data,int flag,struct lwp * l)492 pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag,
493 struct lwp *l)
494 {
495 int s, error, flags, mru, npx;
496 u_int nb;
497 struct ppp_option_data *odp;
498 struct compressor *cp;
499 struct npioctl *npi;
500 time_t t;
501 #ifdef PPP_FILTER
502 struct bpf_program *bp, *nbp;
503 struct bpf_insn *newcode, *oldcode;
504 int newcodelen;
505 #endif /* PPP_FILTER */
506 #ifdef PPP_COMPRESS
507 u_char ccp_option[CCP_MAX_OPTION_LENGTH];
508 #endif
509
510 switch (cmd) {
511 case PPPIOCSFLAGS:
512 case PPPIOCSMRU:
513 case PPPIOCSMAXCID:
514 case PPPIOCSCOMPRESS:
515 case PPPIOCSNPMODE:
516 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE,
517 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if,
518 KAUTH_ARG(cmd), NULL) != 0)
519 return EPERM;
520 break;
521 case PPPIOCXFERUNIT:
522 /* XXX: Why is this privileged?! */
523 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE,
524 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if,
525 KAUTH_ARG(cmd), NULL) != 0)
526 return EPERM;
527 break;
528 default:
529 break;
530 }
531
532 switch (cmd) {
533 case FIONREAD:
534 *(int *)data = sc->sc_inq.ifq_len;
535 break;
536
537 case PPPIOCGUNIT:
538 *(int *)data = sc->sc_unit;
539 break;
540
541 case PPPIOCGFLAGS:
542 *(u_int *)data = sc->sc_flags;
543 break;
544
545 case PPPIOCGRAWIN:
546 {
547 struct ppp_rawin *rwin = (struct ppp_rawin *)data;
548 u_char c, q = 0;
549
550 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);)
551 rwin->buf[q++] = sc->sc_rawin.buf[c++];
552
553 for (c = 0; c < sc->sc_rawin_start;)
554 rwin->buf[q++] = sc->sc_rawin.buf[c++];
555
556 rwin->count = sc->sc_rawin.count;
557 }
558 break;
559
560 case PPPIOCSFLAGS:
561 flags = *(int *)data & SC_MASK;
562 s = splsoftnet();
563 #ifdef PPP_COMPRESS
564 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
565 ppp_ccp_closed(sc);
566 #endif
567 splhigh(); /* XXX IMP ME HARDER */
568 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
569 splx(s);
570 break;
571
572 case PPPIOCSMRU:
573 mru = *(int *)data;
574 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU)
575 sc->sc_mru = mru;
576 break;
577
578 case PPPIOCGMRU:
579 *(int *)data = sc->sc_mru;
580 break;
581
582 #ifdef VJC
583 case PPPIOCSMAXCID:
584 if (sc->sc_comp) {
585 s = splsoftnet();
586 sl_compress_setup(sc->sc_comp, *(int *)data);
587 splx(s);
588 }
589 break;
590 #endif
591
592 case PPPIOCXFERUNIT:
593 sc->sc_xfer = l->l_proc->p_pid;
594 break;
595
596 #ifdef PPP_COMPRESS
597 case PPPIOCSCOMPRESS:
598 odp = (struct ppp_option_data *)data;
599 nb = odp->length;
600 if (nb > sizeof(ccp_option))
601 nb = sizeof(ccp_option);
602 if (nb < 3)
603 return EINVAL;
604 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0)
605 return error;
606 /* preliminary check on the length byte */
607 if (ccp_option[1] < 2)
608 return EINVAL;
609 cp = ppp_get_compressor(ccp_option[0]);
610 if (cp == NULL) {
611 if (sc->sc_flags & SC_DEBUG)
612 printf("%s: no compressor for [%x %x %x], %x\n",
613 sc->sc_if.if_xname, ccp_option[0],
614 ccp_option[1], ccp_option[2], nb);
615 return EINVAL; /* no handler found */
616 }
617 /*
618 * Found a handler for the protocol - try to allocate
619 * a compressor or decompressor.
620 */
621 error = 0;
622 if (odp->transmit) {
623 s = splsoftnet();
624 if (sc->sc_xc_state != NULL) {
625 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
626 ppp_compressor_rele(sc->sc_xcomp);
627 }
628 sc->sc_xcomp = cp;
629 sc->sc_xc_state = cp->comp_alloc(ccp_option, nb);
630 if (sc->sc_xc_state == NULL) {
631 if (sc->sc_flags & SC_DEBUG)
632 printf("%s: comp_alloc failed\n",
633 sc->sc_if.if_xname);
634 error = ENOBUFS;
635 }
636 splhigh(); /* XXX IMP ME HARDER */
637 sc->sc_flags &= ~SC_COMP_RUN;
638 splx(s);
639 } else {
640 s = splsoftnet();
641 if (sc->sc_rc_state != NULL) {
642 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
643 ppp_compressor_rele(sc->sc_rcomp);
644 }
645 sc->sc_rcomp = cp;
646 sc->sc_rc_state = cp->decomp_alloc(ccp_option, nb);
647 if (sc->sc_rc_state == NULL) {
648 if (sc->sc_flags & SC_DEBUG)
649 printf("%s: decomp_alloc failed\n",
650 sc->sc_if.if_xname);
651 error = ENOBUFS;
652 }
653 splhigh(); /* XXX IMP ME HARDER */
654 sc->sc_flags &= ~SC_DECOMP_RUN;
655 splx(s);
656 }
657 return error;
658 #endif /* PPP_COMPRESS */
659
660 case PPPIOCGNPMODE:
661 case PPPIOCSNPMODE:
662 npi = (struct npioctl *)data;
663 switch (npi->protocol) {
664 case PPP_IP:
665 npx = NP_IP;
666 break;
667 case PPP_IPV6:
668 npx = NP_IPV6;
669 break;
670 default:
671 return EINVAL;
672 }
673 if (cmd == PPPIOCGNPMODE) {
674 npi->mode = sc->sc_npmode[npx];
675 } else {
676 if (npi->mode != sc->sc_npmode[npx]) {
677 s = splnet();
678 sc->sc_npmode[npx] = npi->mode;
679 if (npi->mode != NPMODE_QUEUE) {
680 ppp_requeue(sc);
681 ppp_restart(sc);
682 }
683 splx(s);
684 }
685 }
686 break;
687
688 case PPPIOCGIDLE:
689 s = splsoftnet();
690 t = time_second;
691 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent;
692 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv;
693 splx(s);
694 break;
695
696 #ifdef PPP_FILTER
697 case PPPIOCSPASS:
698 case PPPIOCSACTIVE:
699 /* These are no longer supported. */
700 return EOPNOTSUPP;
701
702 case PPPIOCSIPASS:
703 case PPPIOCSOPASS:
704 case PPPIOCSIACTIVE:
705 case PPPIOCSOACTIVE:
706 nbp = (struct bpf_program *)data;
707 if ((unsigned) nbp->bf_len > BPF_MAXINSNS)
708 return EINVAL;
709 newcodelen = nbp->bf_len * sizeof(struct bpf_insn);
710 if (newcodelen != 0) {
711 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK);
712 /* WAITOK -- malloc() never fails. */
713 if ((error = copyin((void *)nbp->bf_insns,
714 (void *)newcode, newcodelen)) != 0) {
715 free(newcode, M_DEVBUF);
716 return error;
717 }
718 if (!bpf_validate(newcode, nbp->bf_len)) {
719 free(newcode, M_DEVBUF);
720 return EINVAL;
721 }
722 } else
723 newcode = 0;
724 switch (cmd) {
725 case PPPIOCSIPASS:
726 bp = &sc->sc_pass_filt_in;
727 break;
728
729 case PPPIOCSOPASS:
730 bp = &sc->sc_pass_filt_out;
731 break;
732
733 case PPPIOCSIACTIVE:
734 bp = &sc->sc_active_filt_in;
735 break;
736
737 case PPPIOCSOACTIVE:
738 bp = &sc->sc_active_filt_out;
739 break;
740 default:
741 free(newcode, M_DEVBUF);
742 return EPASSTHROUGH;
743 }
744 oldcode = bp->bf_insns;
745 s = splnet();
746 bp->bf_len = nbp->bf_len;
747 bp->bf_insns = newcode;
748 splx(s);
749 if (oldcode != 0)
750 free(oldcode, M_DEVBUF);
751 break;
752 #endif /* PPP_FILTER */
753
754 default:
755 return EPASSTHROUGH;
756 }
757 return 0;
758 }
759
760 /*
761 * Process an ioctl request to the ppp network interface.
762 */
763 static int
pppsioctl(struct ifnet * ifp,u_long cmd,void * data)764 pppsioctl(struct ifnet *ifp, u_long cmd, void *data)
765 {
766 struct ppp_softc *sc = ifp->if_softc;
767 struct ifaddr *ifa = (struct ifaddr *)data;
768 struct ifreq *ifr = (struct ifreq *)data;
769 struct ppp_stats *psp;
770 #ifdef PPP_COMPRESS
771 struct ppp_comp_stats *pcp;
772 #endif
773 int s = splnet(), error = 0;
774
775 switch (cmd) {
776 case SIOCSIFFLAGS:
777 if ((error = ifioctl_common(ifp, cmd, data)) != 0)
778 break;
779 if ((ifp->if_flags & IFF_RUNNING) == 0)
780 ifp->if_flags &= ~IFF_UP;
781 break;
782
783 case SIOCINITIFADDR:
784 switch (ifa->ifa_addr->sa_family) {
785 #ifdef INET
786 case AF_INET:
787 break;
788 #endif
789 #ifdef INET6
790 case AF_INET6:
791 break;
792 #endif
793 default:
794 printf("%s: af%d not supported\n", ifp->if_xname,
795 ifa->ifa_addr->sa_family);
796 error = EAFNOSUPPORT;
797 break;
798 }
799 ifa->ifa_rtrequest = p2p_rtrequest;
800 break;
801
802 case SIOCADDMULTI:
803 case SIOCDELMULTI:
804 if (ifr == NULL) {
805 error = EAFNOSUPPORT;
806 break;
807 }
808 switch (ifreq_getaddr(cmd, ifr)->sa_family) {
809 #ifdef INET
810 case AF_INET:
811 break;
812 #endif
813 #ifdef INET6
814 case AF_INET6:
815 break;
816 #endif
817 default:
818 error = EAFNOSUPPORT;
819 break;
820 }
821 break;
822
823 case SIOCGPPPSTATS:
824 psp = &((struct ifpppstatsreq *)data)->stats;
825 memset(psp, 0, sizeof(*psp));
826 psp->p = sc->sc_stats;
827 #if defined(VJC) && !defined(SL_NO_STATS)
828 if (sc->sc_comp) {
829 psp->vj.vjs_packets = sc->sc_comp->sls_packets;
830 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed;
831 psp->vj.vjs_searches = sc->sc_comp->sls_searches;
832 psp->vj.vjs_misses = sc->sc_comp->sls_misses;
833 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin;
834 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin;
835 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin;
836 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed;
837 }
838 #endif /* VJC */
839 break;
840
841 #ifdef PPP_COMPRESS
842 case SIOCGPPPCSTATS:
843 pcp = &((struct ifpppcstatsreq *)data)->stats;
844 memset(pcp, 0, sizeof(*pcp));
845 if (sc->sc_xc_state != NULL)
846 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c);
847 if (sc->sc_rc_state != NULL)
848 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d);
849 break;
850 #endif /* PPP_COMPRESS */
851
852 default:
853 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET)
854 error = 0;
855 break;
856 }
857 splx(s);
858 return error;
859 }
860
861 /*
862 * Queue a packet. Start transmission if not active.
863 * Packet is placed in Information field of PPP frame.
864 */
865 int
pppoutput(struct ifnet * ifp,struct mbuf * m0,const struct sockaddr * dst,const struct rtentry * rtp)866 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst,
867 const struct rtentry *rtp)
868 {
869 struct ppp_softc *sc = ifp->if_softc;
870 int protocol, address, control;
871 u_char *cp;
872 int s, error;
873 #ifdef INET
874 struct ip *ip;
875 #endif
876 struct ifqueue *ifq;
877 enum NPmode mode;
878 int len;
879
880 if (sc->sc_devp == NULL ||
881 (ifp->if_flags & IFF_RUNNING) == 0 ||
882 ((ifp->if_flags & IFF_UP) == 0 &&
883 dst->sa_family != AF_UNSPEC)) {
884 error = ENETDOWN; /* sort of */
885 goto bad;
886 }
887
888 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family);
889
890 /*
891 * Compute PPP header.
892 */
893 m0->m_flags &= ~M_HIGHPRI;
894 switch (dst->sa_family) {
895 #ifdef INET
896 case AF_INET:
897 address = PPP_ALLSTATIONS;
898 control = PPP_UI;
899 protocol = PPP_IP;
900 mode = sc->sc_npmode[NP_IP];
901
902 /*
903 * If this packet has the "low delay" bit set in the IP header,
904 * put it on the fastq instead.
905 */
906 ip = mtod(m0, struct ip *);
907 if (ip->ip_tos & IPTOS_LOWDELAY)
908 m0->m_flags |= M_HIGHPRI;
909 break;
910 #endif
911 #ifdef INET6
912 case AF_INET6:
913 address = PPP_ALLSTATIONS; /*XXX*/
914 control = PPP_UI; /*XXX*/
915 protocol = PPP_IPV6;
916 mode = sc->sc_npmode[NP_IPV6];
917
918 #if 0 /* XXX flowinfo/traffic class, maybe? */
919 /*
920 * If this packet has the "low delay" bit set in the IP header,
921 * put it on the fastq instead.
922 */
923 ip = mtod(m0, struct ip *);
924 if (ip->ip_tos & IPTOS_LOWDELAY)
925 m0->m_flags |= M_HIGHPRI;
926 #endif
927 break;
928 #endif
929 case AF_UNSPEC:
930 address = PPP_ADDRESS(dst->sa_data);
931 control = PPP_CONTROL(dst->sa_data);
932 protocol = PPP_PROTOCOL(dst->sa_data);
933 mode = NPMODE_PASS;
934 break;
935 default:
936 printf("%s: af%d not supported\n", ifp->if_xname,
937 dst->sa_family);
938 error = EAFNOSUPPORT;
939 goto bad;
940 }
941
942 /*
943 * Drop this packet, or return an error, if necessary.
944 */
945 if (mode == NPMODE_ERROR) {
946 error = ENETDOWN;
947 goto bad;
948 }
949 if (mode == NPMODE_DROP) {
950 error = 0;
951 goto bad;
952 }
953
954 /*
955 * Add PPP header.
956 */
957 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT);
958 if (m0 == NULL) {
959 error = ENOBUFS;
960 goto bad;
961 }
962
963 cp = mtod(m0, u_char *);
964 *cp++ = address;
965 *cp++ = control;
966 *cp++ = protocol >> 8;
967 *cp++ = protocol & 0xff;
968
969 len = m_length(m0);
970
971 if (sc->sc_flags & SC_LOG_OUTPKT) {
972 printf("%s output: ", ifp->if_xname);
973 pppdumpm(m0);
974 }
975
976 if ((protocol & 0x8000) == 0) {
977 #ifdef PPP_FILTER
978 /*
979 * Apply the pass and active filters to the packet,
980 * but only if it is a data packet.
981 */
982 if (sc->sc_pass_filt_out.bf_insns != 0 &&
983 bpf_filter(sc->sc_pass_filt_out.bf_insns,
984 (u_char *)m0, len, 0) == 0) {
985 error = 0; /* drop this packet */
986 goto bad;
987 }
988
989 /*
990 * Update the time we sent the most recent packet.
991 */
992 if (sc->sc_active_filt_out.bf_insns == 0 ||
993 bpf_filter(sc->sc_active_filt_out.bf_insns,
994 (u_char *)m0, len, 0))
995 sc->sc_last_sent = time_second;
996 #else
997 /*
998 * Update the time we sent the most recent packet.
999 */
1000 sc->sc_last_sent = time_second;
1001 #endif /* PPP_FILTER */
1002 }
1003
1004 /*
1005 * See if bpf wants to look at the packet.
1006 */
1007 bpf_mtap(&sc->sc_if, m0, BPF_D_OUT);
1008
1009 /*
1010 * Put the packet on the appropriate queue.
1011 */
1012 s = splnet();
1013 if (mode == NPMODE_QUEUE) {
1014 /* XXX we should limit the number of packets on this queue */
1015 *sc->sc_npqtail = m0;
1016 m0->m_nextpkt = NULL;
1017 sc->sc_npqtail = &m0->m_nextpkt;
1018 } else {
1019 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL;
1020 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0)) != 0) {
1021 splx(s);
1022 if_statinc(&sc->sc_if, if_oerrors);
1023 sc->sc_stats.ppp_oerrors++;
1024 return error;
1025 }
1026 ppp_restart(sc);
1027 }
1028 if_statadd2(ifp, if_opackets, 1, if_obytes, len);
1029
1030 splx(s);
1031 return 0;
1032
1033 bad:
1034 m_freem(m0);
1035 return error;
1036 }
1037
1038 /*
1039 * After a change in the NPmode for some NP, move packets from the
1040 * npqueue to the send queue or the fast queue as appropriate.
1041 * Should be called at splnet, since we muck with the queues.
1042 */
1043 static void
ppp_requeue(struct ppp_softc * sc)1044 ppp_requeue(struct ppp_softc *sc)
1045 {
1046 struct mbuf *m, **mpp;
1047 struct ifqueue *ifq;
1048 enum NPmode mode;
1049 int error;
1050
1051 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) {
1052 switch (PPP_PROTOCOL(mtod(m, u_char *))) {
1053 case PPP_IP:
1054 mode = sc->sc_npmode[NP_IP];
1055 break;
1056 case PPP_IPV6:
1057 mode = sc->sc_npmode[NP_IPV6];
1058 break;
1059 default:
1060 mode = NPMODE_PASS;
1061 }
1062
1063 switch (mode) {
1064 case NPMODE_PASS:
1065 /*
1066 * This packet can now go on one of the queues to
1067 * be sent.
1068 */
1069 *mpp = m->m_nextpkt;
1070 m->m_nextpkt = NULL;
1071 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL;
1072 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m)) != 0) {
1073 if_statinc(&sc->sc_if, if_oerrors);
1074 sc->sc_stats.ppp_oerrors++;
1075 }
1076 break;
1077
1078 case NPMODE_DROP:
1079 case NPMODE_ERROR:
1080 *mpp = m->m_nextpkt;
1081 m_freem(m);
1082 break;
1083
1084 case NPMODE_QUEUE:
1085 mpp = &m->m_nextpkt;
1086 break;
1087 }
1088 }
1089 sc->sc_npqtail = mpp;
1090 }
1091
1092 /*
1093 * Transmitter has finished outputting some stuff;
1094 * remember to call sc->sc_start later at splsoftnet.
1095 */
1096 void
ppp_restart(struct ppp_softc * sc)1097 ppp_restart(struct ppp_softc *sc)
1098 {
1099 int s = splhigh(); /* XXX IMP ME HARDER */
1100
1101 sc->sc_flags &= ~SC_TBUSY;
1102 softint_schedule(sc->sc_si);
1103 splx(s);
1104 }
1105
1106 /*
1107 * Get a packet to send. This procedure is intended to be called at
1108 * splsoftnet, since it may involve time-consuming operations such as
1109 * applying VJ compression, packet compression, address/control and/or
1110 * protocol field compression to the packet.
1111 */
1112 struct mbuf *
ppp_dequeue(struct ppp_softc * sc)1113 ppp_dequeue(struct ppp_softc *sc)
1114 {
1115 struct mbuf *m, *mp;
1116 u_char *cp;
1117 int address, control, protocol;
1118 int s;
1119
1120 /*
1121 * Grab a packet to send: first try the fast queue, then the
1122 * normal queue.
1123 */
1124 s = splnet();
1125 if (sc->sc_nfastq < sc->sc_maxfastq) {
1126 IF_DEQUEUE(&sc->sc_fastq, m);
1127 if (m != NULL)
1128 sc->sc_nfastq++;
1129 else
1130 IFQ_DEQUEUE(&sc->sc_if.if_snd, m);
1131 } else {
1132 sc->sc_nfastq = 0;
1133 IFQ_DEQUEUE(&sc->sc_if.if_snd, m);
1134 if (m == NULL) {
1135 IF_DEQUEUE(&sc->sc_fastq, m);
1136 if (m != NULL)
1137 sc->sc_nfastq++;
1138 }
1139 }
1140 splx(s);
1141
1142 if (m == NULL)
1143 return NULL;
1144
1145 ++sc->sc_stats.ppp_opackets;
1146
1147 /*
1148 * Extract the ppp header of the new packet.
1149 * The ppp header will be in one mbuf.
1150 */
1151 cp = mtod(m, u_char *);
1152 address = PPP_ADDRESS(cp);
1153 control = PPP_CONTROL(cp);
1154 protocol = PPP_PROTOCOL(cp);
1155
1156 switch (protocol) {
1157 case PPP_IP:
1158 #ifdef VJC
1159 /*
1160 * If the packet is a TCP/IP packet, see if we can compress it.
1161 */
1162 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
1163 struct ip *ip;
1164 int type;
1165
1166 mp = m;
1167 ip = (struct ip *)(cp + PPP_HDRLEN);
1168 if (mp->m_len <= PPP_HDRLEN) {
1169 mp = mp->m_next;
1170 if (mp == NULL)
1171 break;
1172 ip = mtod(mp, struct ip *);
1173 }
1174 /*
1175 * This code assumes the IP/TCP header is in one
1176 * non-shared mbuf
1177 */
1178 if (ip->ip_p == IPPROTO_TCP) {
1179 type = sl_compress_tcp(mp, ip, sc->sc_comp,
1180 !(sc->sc_flags & SC_NO_TCP_CCID));
1181 switch (type) {
1182 case TYPE_UNCOMPRESSED_TCP:
1183 protocol = PPP_VJC_UNCOMP;
1184 break;
1185 case TYPE_COMPRESSED_TCP:
1186 protocol = PPP_VJC_COMP;
1187 cp = mtod(m, u_char *);
1188 cp[0] = address; /* Header has moved */
1189 cp[1] = control;
1190 cp[2] = 0;
1191 break;
1192 }
1193 /* Update protocol in PPP header */
1194 cp[3] = protocol;
1195 }
1196 }
1197 #endif /* VJC */
1198 break;
1199
1200 #ifdef PPP_COMPRESS
1201 case PPP_CCP:
1202 ppp_ccp(sc, m, 0);
1203 break;
1204 #endif /* PPP_COMPRESS */
1205 }
1206
1207 #ifdef PPP_COMPRESS
1208 if (protocol != PPP_LCP && protocol != PPP_CCP &&
1209 sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
1210 struct mbuf *mcomp = NULL;
1211 int slen;
1212
1213 slen = 0;
1214 for (mp = m; mp != NULL; mp = mp->m_next)
1215 slen += mp->m_len;
1216 (*sc->sc_xcomp->compress)
1217 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN);
1218 if (mcomp != NULL) {
1219 if (sc->sc_flags & SC_CCP_UP) {
1220 /*
1221 * Send the compressed packet instead of the
1222 * original.
1223 */
1224 m_freem(m);
1225 m = mcomp;
1226 cp = mtod(m, u_char *);
1227 protocol = cp[3];
1228 } else {
1229 /*
1230 * Can't transmit compressed packets until CCP
1231 * is up.
1232 */
1233 m_freem(mcomp);
1234 }
1235 }
1236 }
1237 #endif /* PPP_COMPRESS */
1238
1239 /*
1240 * Compress the address/control and protocol, if possible.
1241 */
1242 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
1243 control == PPP_UI && protocol != PPP_ALLSTATIONS &&
1244 protocol != PPP_LCP) {
1245 /* can compress address/control */
1246 m->m_data += 2;
1247 m->m_len -= 2;
1248 }
1249 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
1250 /* can compress protocol */
1251 if (mtod(m, u_char *) == cp) {
1252 cp[2] = cp[1]; /* move address/control up */
1253 cp[1] = cp[0];
1254 }
1255 ++m->m_data;
1256 --m->m_len;
1257 }
1258
1259 return m;
1260 }
1261
1262 /*
1263 * Software interrupt routine, called at splsoftnet.
1264 */
1265 static void
pppintr(void * arg)1266 pppintr(void *arg)
1267 {
1268 struct ppp_softc *sc = arg;
1269 struct mbuf *m;
1270 int s;
1271
1272 mutex_enter(softnet_lock);
1273 if (!(sc->sc_flags & SC_TBUSY) &&
1274 (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 ||
1275 sc->sc_fastq.ifq_head ||
1276 sc->sc_outm)) {
1277 s = splhigh(); /* XXX IMP ME HARDER */
1278 sc->sc_flags |= SC_TBUSY;
1279 splx(s);
1280 (*sc->sc_start)(sc);
1281 }
1282 for (;;) {
1283 s = splnet();
1284 IF_DEQUEUE(&sc->sc_rawq, m);
1285 splx(s);
1286 if (m == NULL)
1287 break;
1288 ppp_inproc(sc, m);
1289 }
1290 mutex_exit(softnet_lock);
1291 }
1292
1293 #ifdef PPP_COMPRESS
1294 /*
1295 * Handle a CCP packet. `rcvd' is 1 if the packet was received,
1296 * 0 if it is about to be transmitted.
1297 */
1298 static void
ppp_ccp(struct ppp_softc * sc,struct mbuf * m,int rcvd)1299 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd)
1300 {
1301 u_char *dp, *ep;
1302 struct mbuf *mp;
1303 int slen, s;
1304
1305 /*
1306 * Get a pointer to the data after the PPP header.
1307 */
1308 if (m->m_len <= PPP_HDRLEN) {
1309 mp = m->m_next;
1310 if (mp == NULL)
1311 return;
1312 dp = mtod(mp, u_char *);
1313 } else {
1314 mp = m;
1315 dp = mtod(mp, u_char *) + PPP_HDRLEN;
1316 }
1317
1318 ep = mtod(mp, u_char *) + mp->m_len;
1319 if (dp + CCP_HDRLEN > ep)
1320 return;
1321 slen = CCP_LENGTH(dp);
1322 if (dp + slen > ep) {
1323 if (sc->sc_flags & SC_DEBUG)
1324 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n",
1325 dp, slen, mtod(mp, u_char *), mp->m_len);
1326 return;
1327 }
1328
1329 switch (CCP_CODE(dp)) {
1330 case CCP_CONFREQ:
1331 case CCP_TERMREQ:
1332 case CCP_TERMACK:
1333 /* CCP must be going down - disable compression */
1334 if (sc->sc_flags & SC_CCP_UP) {
1335 s = splhigh(); /* XXX IMP ME HARDER */
1336 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
1337 splx(s);
1338 }
1339 break;
1340
1341 case CCP_CONFACK:
1342 if (sc->sc_flags & SC_CCP_OPEN &&
1343 !(sc->sc_flags & SC_CCP_UP) &&
1344 slen >= CCP_HDRLEN + CCP_OPT_MINLEN &&
1345 slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) {
1346 if (!rcvd) {
1347 /* We're agreeing to send compressed packets. */
1348 if (sc->sc_xc_state != NULL &&
1349 (*sc->sc_xcomp->comp_init)(sc->sc_xc_state,
1350 dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1351 sc->sc_unit, 0,
1352 sc->sc_flags & SC_DEBUG)) {
1353 s = splhigh(); /* XXX IMP ME HARDER */
1354 sc->sc_flags |= SC_COMP_RUN;
1355 splx(s);
1356 }
1357 } else {
1358 /*
1359 * Peer is agreeing to send compressed
1360 * packets.
1361 */
1362 if (sc->sc_rc_state != NULL &&
1363 (*sc->sc_rcomp->decomp_init)(
1364 sc->sc_rc_state,
1365 dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1366 sc->sc_unit, 0, sc->sc_mru,
1367 sc->sc_flags & SC_DEBUG)) {
1368 s = splhigh(); /* XXX IMP ME HARDER */
1369 sc->sc_flags |= SC_DECOMP_RUN;
1370 sc->sc_flags &=
1371 ~(SC_DC_ERROR | SC_DC_FERROR);
1372 splx(s);
1373 }
1374 }
1375 }
1376 break;
1377
1378 case CCP_RESETACK:
1379 if (sc->sc_flags & SC_CCP_UP) {
1380 if (!rcvd) {
1381 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN))
1382 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state);
1383 } else {
1384 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1385 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state);
1386 s = splhigh(); /* XXX IMP ME HARDER */
1387 sc->sc_flags &= ~SC_DC_ERROR;
1388 splx(s);
1389 }
1390 }
1391 }
1392 break;
1393 }
1394 }
1395
1396 /*
1397 * CCP is down; free (de)compressor state if necessary.
1398 */
1399 static void
ppp_ccp_closed(struct ppp_softc * sc)1400 ppp_ccp_closed(struct ppp_softc *sc)
1401 {
1402 if (sc->sc_xc_state) {
1403 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
1404 ppp_compressor_rele(sc->sc_xcomp);
1405 sc->sc_xc_state = NULL;
1406 }
1407 if (sc->sc_rc_state) {
1408 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
1409 ppp_compressor_rele(sc->sc_rcomp);
1410 sc->sc_rc_state = NULL;
1411 }
1412 }
1413 #endif /* PPP_COMPRESS */
1414
1415 /*
1416 * PPP packet input routine.
1417 * The caller has checked and removed the FCS and has inserted
1418 * the address/control bytes and the protocol high byte if they
1419 * were omitted.
1420 */
1421 void
ppppktin(struct ppp_softc * sc,struct mbuf * m,int lost)1422 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost)
1423 {
1424 int s = splhigh(); /* XXX IMP ME HARDER */
1425
1426 if (lost)
1427 m->m_flags |= M_ERRMARK;
1428 IF_ENQUEUE(&sc->sc_rawq, m);
1429 softint_schedule(sc->sc_si);
1430 splx(s);
1431 }
1432
1433 /*
1434 * Process a received PPP packet, doing decompression as necessary.
1435 * Should be called at splsoftnet.
1436 */
1437 #define COMPTYPE(proto) \
1438 ((proto) == PPP_VJC_COMP ? TYPE_COMPRESSED_TCP \
1439 : TYPE_UNCOMPRESSED_TCP)
1440
1441 static void
ppp_inproc(struct ppp_softc * sc,struct mbuf * m)1442 ppp_inproc(struct ppp_softc *sc, struct mbuf *m)
1443 {
1444 struct ifnet *ifp = &sc->sc_if;
1445 pktqueue_t *pktq = NULL;
1446 struct ifqueue *inq = NULL;
1447 int s, ilen, proto, rv;
1448 u_char *cp, adrs, ctrl;
1449 struct mbuf *mp, *dmp = NULL;
1450 #ifdef VJC
1451 int xlen;
1452 u_char *iphdr;
1453 u_int hlen;
1454 #endif
1455
1456 sc->sc_stats.ppp_ipackets++;
1457
1458 if (sc->sc_flags & SC_LOG_INPKT) {
1459 ilen = 0;
1460 for (mp = m; mp != NULL; mp = mp->m_next)
1461 ilen += mp->m_len;
1462 printf("%s: got %d bytes\n", ifp->if_xname, ilen);
1463 pppdumpm(m);
1464 }
1465
1466 cp = mtod(m, u_char *);
1467 adrs = PPP_ADDRESS(cp);
1468 ctrl = PPP_CONTROL(cp);
1469 proto = PPP_PROTOCOL(cp);
1470
1471 if (m->m_flags & M_ERRMARK) {
1472 m->m_flags &= ~M_ERRMARK;
1473 s = splhigh(); /* XXX IMP ME HARDER */
1474 sc->sc_flags |= SC_VJ_RESET;
1475 splx(s);
1476 }
1477
1478 #ifdef PPP_COMPRESS
1479 /*
1480 * Decompress this packet if necessary, update the receiver's
1481 * dictionary, or take appropriate action on a CCP packet.
1482 */
1483 if (proto == PPP_COMP &&
1484 sc->sc_rc_state &&
1485 (sc->sc_flags & SC_DECOMP_RUN) &&
1486 !(sc->sc_flags & SC_DC_ERROR) &&
1487 !(sc->sc_flags & SC_DC_FERROR)) {
1488 /* Decompress this packet */
1489 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp);
1490 if (rv == DECOMP_OK) {
1491 m_freem(m);
1492 if (dmp == NULL) {
1493 /*
1494 * No error, but no decompressed packet
1495 * produced
1496 */
1497 return;
1498 }
1499 m = dmp;
1500 cp = mtod(m, u_char *);
1501 proto = PPP_PROTOCOL(cp);
1502
1503 } else {
1504 /*
1505 * An error has occurred in decompression.
1506 * Pass the compressed packet up to pppd, which may
1507 * take CCP down or issue a Reset-Req.
1508 */
1509 if (sc->sc_flags & SC_DEBUG)
1510 printf("%s: decompress failed %d\n",
1511 ifp->if_xname, rv);
1512 s = splhigh(); /* XXX IMP ME HARDER */
1513 sc->sc_flags |= SC_VJ_RESET;
1514 if (rv == DECOMP_ERROR)
1515 sc->sc_flags |= SC_DC_ERROR;
1516 else
1517 sc->sc_flags |= SC_DC_FERROR;
1518 splx(s);
1519 }
1520
1521 } else {
1522 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN))
1523 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m);
1524 if (proto == PPP_CCP)
1525 ppp_ccp(sc, m, 1);
1526 }
1527 #endif
1528
1529 ilen = 0;
1530 for (mp = m; mp != NULL; mp = mp->m_next)
1531 ilen += mp->m_len;
1532
1533 #ifdef VJC
1534 if (sc->sc_flags & SC_VJ_RESET) {
1535 /*
1536 * If we've missed a packet, we must toss subsequent compressed
1537 * packets which don't have an explicit connection ID.
1538 */
1539 if (sc->sc_comp)
1540 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp);
1541 s = splhigh(); /* XXX IMP ME HARDER */
1542 sc->sc_flags &= ~SC_VJ_RESET;
1543 splx(s);
1544 }
1545
1546 /*
1547 * See if we have a VJ-compressed packet to uncompress.
1548 */
1549 if (proto == PPP_VJC_COMP) {
1550 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1551 goto bad;
1552
1553 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN,
1554 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN,
1555 TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen);
1556 if (xlen <= 0) {
1557 if (sc->sc_flags & SC_DEBUG) {
1558 printf("%s: VJ uncompress failed"
1559 " on type comp\n",
1560 ifp->if_xname);
1561 }
1562 goto bad;
1563 }
1564
1565 /* Copy the PPP and IP headers into a new mbuf. */
1566 MGETHDR(mp, M_DONTWAIT, MT_DATA);
1567 if (mp == NULL)
1568 goto bad;
1569 mp->m_len = 0;
1570 mp->m_next = NULL;
1571 if (hlen + PPP_HDRLEN > MHLEN) {
1572 MCLGET(mp, M_DONTWAIT);
1573 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) {
1574 /* Lose if big headers and no clusters */
1575 m_freem(mp);
1576 goto bad;
1577 }
1578 }
1579 cp = mtod(mp, u_char *);
1580 cp[0] = adrs;
1581 cp[1] = ctrl;
1582 cp[2] = 0;
1583 cp[3] = PPP_IP;
1584 proto = PPP_IP;
1585 bcopy(iphdr, cp + PPP_HDRLEN, hlen);
1586 mp->m_len = hlen + PPP_HDRLEN;
1587
1588 /*
1589 * Trim the PPP and VJ headers off the old mbuf
1590 * and stick the new and old mbufs together.
1591 */
1592 m->m_data += PPP_HDRLEN + xlen;
1593 m->m_len -= PPP_HDRLEN + xlen;
1594 if (m->m_len <= M_TRAILINGSPACE(mp)) {
1595 bcopy(mtod(m, u_char *),
1596 mtod(mp, u_char *) + mp->m_len, m->m_len);
1597 mp->m_len += m->m_len;
1598 mp->m_next = m_free(m);
1599 } else
1600 mp->m_next = m;
1601 m = mp;
1602 ilen += hlen - xlen;
1603
1604 } else if (proto == PPP_VJC_UNCOMP) {
1605 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1606 goto bad;
1607
1608 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN,
1609 m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN,
1610 TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen);
1611 if (xlen < 0) {
1612 if (sc->sc_flags & SC_DEBUG) {
1613 printf("%s: VJ uncompress failed"
1614 " on type uncomp\n",
1615 ifp->if_xname);
1616 }
1617 goto bad;
1618 }
1619
1620 proto = PPP_IP;
1621 cp[3] = PPP_IP;
1622 }
1623 #endif /* VJC */
1624
1625 /*
1626 * If the packet will fit in a header mbuf, don't waste a
1627 * whole cluster on it.
1628 */
1629 if (ilen <= MHLEN && (m->m_flags & M_EXT)) {
1630 MGETHDR(mp, M_DONTWAIT, MT_DATA);
1631 if (mp != NULL) {
1632 m_copydata(m, 0, ilen, mtod(mp, void *));
1633 m_freem(m);
1634 m = mp;
1635 m->m_len = ilen;
1636 }
1637 }
1638 m->m_pkthdr.len = ilen;
1639 m_set_rcvif(m, ifp);
1640
1641 if ((proto & 0x8000) == 0) {
1642 #ifdef PPP_FILTER
1643 /*
1644 * See whether we want to pass this packet, and
1645 * if it counts as link activity.
1646 */
1647 if (sc->sc_pass_filt_in.bf_insns != 0 &&
1648 bpf_filter(sc->sc_pass_filt_in.bf_insns,
1649 (u_char *)m, ilen, 0) == 0) {
1650 /* drop this packet */
1651 m_freem(m);
1652 return;
1653 }
1654 if (sc->sc_active_filt_in.bf_insns == 0 ||
1655 bpf_filter(sc->sc_active_filt_in.bf_insns,
1656 (u_char *)m, ilen, 0))
1657 sc->sc_last_recv = time_second;
1658 #else
1659 /*
1660 * Record the time that we received this packet.
1661 */
1662 sc->sc_last_recv = time_second;
1663 #endif /* PPP_FILTER */
1664 }
1665
1666 /* See if bpf wants to look at the packet. */
1667 bpf_mtap(&sc->sc_if, m, BPF_D_IN);
1668
1669 switch (proto) {
1670 #ifdef INET
1671 case PPP_IP:
1672 /*
1673 * IP packet - take off the ppp header and pass it up to IP.
1674 */
1675 if ((ifp->if_flags & IFF_UP) == 0 ||
1676 sc->sc_npmode[NP_IP] != NPMODE_PASS) {
1677 /* Interface is down - drop the packet. */
1678 m_freem(m);
1679 return;
1680 }
1681 m->m_pkthdr.len -= PPP_HDRLEN;
1682 m->m_data += PPP_HDRLEN;
1683 m->m_len -= PPP_HDRLEN;
1684 #ifdef GATEWAY
1685 if (ipflow_fastforward(m))
1686 return;
1687 #endif
1688 pktq = ip_pktq;
1689 break;
1690 #endif
1691
1692 #ifdef INET6
1693 case PPP_IPV6:
1694 /*
1695 * IPv6 packet - take off the ppp header and pass it up to
1696 * IPv6.
1697 */
1698 if ((ifp->if_flags & IFF_UP) == 0 ||
1699 sc->sc_npmode[NP_IPV6] != NPMODE_PASS) {
1700 /* interface is down - drop the packet. */
1701 m_freem(m);
1702 return;
1703 }
1704 m->m_pkthdr.len -= PPP_HDRLEN;
1705 m->m_data += PPP_HDRLEN;
1706 m->m_len -= PPP_HDRLEN;
1707 #ifdef GATEWAY
1708 if (ip6flow_fastforward(&m))
1709 return;
1710 #endif
1711 pktq = ip6_pktq;
1712 break;
1713 #endif
1714
1715 default:
1716 /*
1717 * Some other protocol - place on input queue for read().
1718 */
1719 inq = &sc->sc_inq;
1720 pktq = NULL;
1721 break;
1722 }
1723
1724 /*
1725 * Put the packet on the appropriate input queue.
1726 */
1727 s = splnet();
1728
1729 /* pktq: inet or inet6 cases */
1730 if (__predict_true(pktq)) {
1731 if (__predict_false(!pktq_enqueue(pktq, m, 0))) {
1732 splx(s);
1733 if_statinc(ifp, if_iqdrops);
1734 goto bad;
1735 }
1736 if_statadd2(ifp, if_ipackets, 1, if_ibytes, ilen);
1737 splx(s);
1738 return;
1739 }
1740
1741 /* ifq: other protocol cases */
1742 if (!inq) {
1743 splx(s);
1744 goto bad;
1745 }
1746 if (IF_QFULL(inq)) {
1747 IF_DROP(inq);
1748 splx(s);
1749 if (sc->sc_flags & SC_DEBUG)
1750 printf("%s: input queue full\n", ifp->if_xname);
1751 if_statinc(ifp, if_iqdrops);
1752 goto bad;
1753 }
1754 IF_ENQUEUE(inq, m);
1755 splx(s);
1756 if_statadd2(ifp, if_ipackets, 1, if_ibytes, ilen);
1757
1758 (*sc->sc_ctlp)(sc);
1759
1760 return;
1761
1762 bad:
1763 m_freem(m);
1764 if_statinc(&sc->sc_if, if_ierrors);
1765 sc->sc_stats.ppp_ierrors++;
1766 }
1767
1768 #define MAX_DUMP_BYTES 128
1769
1770 static void
pppdumpm(struct mbuf * m0)1771 pppdumpm(struct mbuf *m0)
1772 {
1773 char buf[3*MAX_DUMP_BYTES+4];
1774 char *bp = buf;
1775 struct mbuf *m;
1776
1777 for (m = m0; m; m = m->m_next) {
1778 int l = m->m_len;
1779 u_char *rptr = (u_char *)m->m_data;
1780
1781 while (l--) {
1782 if (bp > buf + sizeof(buf) - 4)
1783 goto done;
1784 /* Convert byte to ascii hex */
1785 *bp++ = hexdigits[*rptr >> 4];
1786 *bp++ = hexdigits[*rptr++ & 0xf];
1787 }
1788
1789 if (m->m_next) {
1790 if (bp > buf + sizeof(buf) - 3)
1791 goto done;
1792 *bp++ = '|';
1793 } else
1794 *bp++ = ' ';
1795 }
1796 done:
1797 if (m)
1798 *bp++ = '>';
1799 *bp = 0;
1800 printf("%s\n", buf);
1801 }
1802
1803 #ifdef ALTQ
1804 /*
1805 * A wrapper to transmit a packet from if_start since ALTQ uses
1806 * if_start to send a packet.
1807 */
1808 static void
ppp_ifstart(struct ifnet * ifp)1809 ppp_ifstart(struct ifnet *ifp)
1810 {
1811 struct ppp_softc *sc;
1812
1813 sc = ifp->if_softc;
1814 (*sc->sc_start)(sc);
1815 }
1816 #endif
1817
1818 static const struct ppp_known_compressor {
1819 uint8_t code;
1820 const char *module;
1821 } ppp_known_compressors[] = {
1822 { CI_DEFLATE, "ppp_deflate" },
1823 { CI_DEFLATE_DRAFT, "ppp_deflate" },
1824 { CI_BSD_COMPRESS, "ppp_bsdcomp" },
1825 { CI_MPPE, "ppp_mppe" },
1826 { 0, NULL }
1827 };
1828
1829 static int
ppp_compressor_init(void)1830 ppp_compressor_init(void)
1831 {
1832
1833 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE);
1834 return 0;
1835 }
1836
1837 static int
ppp_compressor_destroy(void)1838 ppp_compressor_destroy(void)
1839 {
1840
1841 mutex_destroy(&ppp_compressors_mtx);
1842 return 0;
1843 }
1844
1845 static void
ppp_compressor_rele(struct compressor * cp)1846 ppp_compressor_rele(struct compressor *cp)
1847 {
1848
1849 mutex_enter(&ppp_compressors_mtx);
1850 --cp->comp_refcnt;
1851 mutex_exit(&ppp_compressors_mtx);
1852 }
1853
1854 static struct compressor *
ppp_get_compressor_noload(uint8_t ci,bool hold)1855 ppp_get_compressor_noload(uint8_t ci, bool hold)
1856 {
1857 struct compressor *cp;
1858
1859 KASSERT(mutex_owned(&ppp_compressors_mtx));
1860 LIST_FOREACH(cp, &ppp_compressors, comp_list) {
1861 if (cp->compress_proto == ci) {
1862 if (hold)
1863 ++cp->comp_refcnt;
1864 return cp;
1865 }
1866 }
1867
1868 return NULL;
1869 }
1870
1871 static struct compressor *
ppp_get_compressor(uint8_t ci)1872 ppp_get_compressor(uint8_t ci)
1873 {
1874 struct compressor *cp = NULL;
1875 const struct ppp_known_compressor *pkc;
1876
1877 mutex_enter(&ppp_compressors_mtx);
1878 cp = ppp_get_compressor_noload(ci, true);
1879 mutex_exit(&ppp_compressors_mtx);
1880 if (cp != NULL)
1881 return cp;
1882
1883 kernconfig_lock();
1884 mutex_enter(&ppp_compressors_mtx);
1885 cp = ppp_get_compressor_noload(ci, true);
1886 mutex_exit(&ppp_compressors_mtx);
1887 if (cp == NULL) {
1888 /* Not found, so try to autoload a module */
1889 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) {
1890 if (pkc->code == ci) {
1891 if (module_autoload(pkc->module,
1892 MODULE_CLASS_MISC) != 0)
1893 break;
1894 mutex_enter(&ppp_compressors_mtx);
1895 cp = ppp_get_compressor_noload(ci, true);
1896 mutex_exit(&ppp_compressors_mtx);
1897 break;
1898 }
1899 }
1900 }
1901 kernconfig_unlock();
1902
1903 return cp;
1904 }
1905
1906 int
ppp_register_compressor(struct compressor * pc,size_t ncomp)1907 ppp_register_compressor(struct compressor *pc, size_t ncomp)
1908 {
1909 int error = 0;
1910 size_t i;
1911
1912 mutex_enter(&ppp_compressors_mtx);
1913 for (i = 0; i < ncomp; i++) {
1914 if (ppp_get_compressor_noload(pc[i].compress_proto,
1915 false) != NULL)
1916 error = EEXIST;
1917 }
1918 if (!error) {
1919 for (i = 0; i < ncomp; i++) {
1920 pc[i].comp_refcnt = 0;
1921 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list);
1922 }
1923 }
1924 mutex_exit(&ppp_compressors_mtx);
1925
1926 return error;
1927 }
1928
1929 int
ppp_unregister_compressor(struct compressor * pc,size_t ncomp)1930 ppp_unregister_compressor(struct compressor *pc, size_t ncomp)
1931 {
1932 int error = 0;
1933 size_t i;
1934
1935 mutex_enter(&ppp_compressors_mtx);
1936 for (i = 0; i < ncomp; i++) {
1937 if (ppp_get_compressor_noload(pc[i].compress_proto,
1938 false) != &pc[i])
1939 error = ENOENT;
1940 else if (pc[i].comp_refcnt != 0)
1941 error = EBUSY;
1942 }
1943 if (!error) {
1944 for (i = 0; i < ncomp; i++) {
1945 LIST_REMOVE(&pc[i], comp_list);
1946 }
1947 }
1948 mutex_exit(&ppp_compressors_mtx);
1949
1950 return error;
1951 }
1952
1953 /*
1954 * Module infrastructure
1955 */
1956 #include "if_module.h"
1957
1958 #ifdef PPP_FILTER
1959 #define PPP_DEP "bpf_filter,"
1960 #else
1961 #define PPP_DEP
1962 #endif
1963
1964 IF_MODULE(MODULE_CLASS_DRIVER, ppp, PPP_DEP "slcompress")
1965