2 * ppp_comp.c - STREAMS module for kernel-level compression and CCP support.
4 * Copyright (c) 1994 Paul Mackerras. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * 3. The name(s) of the authors of this software must not be used to
19 * endorse or promote products derived from this software without
20 * prior written permission.
22 * 4. Redistributions of any form whatsoever must retain the following
24 * "This product includes software developed by Paul Mackerras
25 * <paulus@samba.org>".
27 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
28 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
29 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
30 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
31 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
32 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
33 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
35 * $Id: ppp_comp.c,v 1.3 2004/01/17 05:47:55 carlsonj Exp $
39 * This file is used under SVR4, Solaris 2, SunOS 4, and Digital UNIX.
42 #include <sys/types.h>
43 #include <sys/param.h>
44 #include <sys/errno.h>
45 #include <sys/stream.h>
49 #include <sys/cmn_err.h>
54 #include <sys/cmn_err.h>
58 #include <net/ppp_defs.h>
59 #include <net/pppio.h>
64 #include <sys/protosw.h>
67 #include <netinet/in.h>
68 #include <netinet/in_systm.h>
69 #include <netinet/ip.h>
70 #include <net/vjcompress.h>
72 #define PACKETPTR mblk_t *
73 #include <net/ppp-comp.h>
75 MOD_OPEN_DECL(ppp_comp_open);
76 MOD_CLOSE_DECL(ppp_comp_close);
77 static int ppp_comp_rput __P((queue_t *, mblk_t *));
78 static int ppp_comp_rsrv __P((queue_t *));
79 static int ppp_comp_wput __P((queue_t *, mblk_t *));
80 static int ppp_comp_wsrv __P((queue_t *));
81 static void ppp_comp_ccp __P((queue_t *, mblk_t *, int));
82 static int msg_byte __P((mblk_t *, unsigned int));
84 /* Extract byte i of message mp. */
85 #define MSG_BYTE(mp, i) ((i) < (mp)->b_wptr - (mp)->b_rptr? (mp)->b_rptr[i]: \
88 /* Is this LCP packet one we have to transmit using LCP defaults? */
89 #define LCP_USE_DFLT(mp) (1 <= (code = MSG_BYTE((mp), 4)) && code <= 7)
91 #define PPP_COMP_ID 0xbadf
92 static struct module_info minfo = {
94 PPP_COMP_ID, "ppp_comp", 0, INFPSZ, 16512, 16384,
96 PPP_COMP_ID, "ppp_comp", 0, INFPSZ, 16384, 4096,
100 static struct qinit r_init = {
101 ppp_comp_rput, ppp_comp_rsrv, ppp_comp_open, ppp_comp_close,
105 static struct qinit w_init = {
106 ppp_comp_wput, ppp_comp_wsrv, NULL, NULL, NULL, &minfo, NULL
109 #if defined(SVR4) && !defined(SOL2)
111 #define ppp_compinfo pcmpinfo
113 struct streamtab ppp_compinfo = {
114 &r_init, &w_init, NULL, NULL
117 int ppp_comp_count; /* number of module instances in use */
121 static void ppp_comp_alloc __P((comp_state_t *));
122 typedef struct memreq {
123 unsigned char comp_opts[20];
131 typedef struct comp_state {
136 struct compressor *xcomp;
138 struct compressor *rcomp;
140 struct vjcompress vj_comp;
142 struct pppstat stats;
151 extern task_t first_task;
154 /* Bits in flags are as defined in pppio.h. */
155 #define CCP_ERR (CCP_ERROR | CCP_FATALERROR)
156 #define LAST_MOD 0x1000000 /* no ppp modules below us */
157 #define DBGLOG 0x2000000 /* log debugging stuff */
159 #define MAX_IPHDR 128 /* max TCP/IP header size */
160 #define MAX_VJHDR 20 /* max VJ compressed header size (?) */
162 #undef MIN /* just in case */
163 #define MIN(a, b) ((a) < (b)? (a): (b))
166 * List of compressors we know about.
170 extern struct compressor ppp_bsd_compress;
173 extern struct compressor ppp_deflate, ppp_deflate_draft;
176 struct compressor *ppp_compressors[] = {
188 * STREAMS module entry points.
190 MOD_OPEN(ppp_comp_open)
197 if (q->q_ptr == NULL) {
198 cp = (comp_state_t *) ALLOC_SLEEP(sizeof(comp_state_t));
201 bzero((caddr_t)cp, sizeof(comp_state_t));
202 WR(q)->q_ptr = q->q_ptr = (caddr_t) cp;
207 vj_compress_init(&cp->vj_comp, -1);
209 if (!(thread = kernel_thread_w_arg(first_task, ppp_comp_alloc, (void *)cp)))
219 MOD_CLOSE(ppp_comp_close)
224 cp = (comp_state_t *) q->q_ptr;
226 if (cp->xstate != NULL)
227 (*cp->xcomp->comp_free)(cp->xstate);
228 if (cp->rstate != NULL)
229 (*cp->rcomp->decomp_free)(cp->rstate);
232 printf("ppp_comp_close: NULL thread!\n");
234 thread_terminate(cp->thread);
236 FREE(cp, sizeof(comp_state_t));
238 OTHERQ(q)->q_ptr = NULL;
246 /* thread for calling back to a compressor's memory allocator
247 * Needed for Digital UNIX since it's VM can't handle requests
248 * for large amounts of memory without blocking. The thread
249 * provides a context in which we can call a memory allocator
253 ppp_comp_alloc(comp_state_t *cp)
256 unsigned char *compressor_options;
258 void *(*comp_allocator)();
261 #if defined(MAJOR_VERSION) && (MAJOR_VERSION <= 2)
263 /* In 2.x and earlier the argument gets passed
264 * in the thread structure itself. Yuck.
266 thread = current_thread();
267 cp = thread->reply_port;
268 thread->reply_port = PORT_NULL;
273 assert_wait((vm_offset_t)&cp->memreq.thread_status, TRUE);
276 if (thread_should_halt(current_thread()))
278 cmd = cp->memreq.cmd;
279 compressor_options = &cp->memreq.comp_opts[0];
280 len = compressor_options[1];
281 if (cmd == PPPIO_XCOMP) {
282 cp->memreq.returned_mem = cp->xcomp->comp_alloc(compressor_options, len);
283 if (!cp->memreq.returned_mem) {
284 cp->memreq.thread_status = ENOSR;
286 cp->memreq.thread_status = 0;
289 cp->memreq.returned_mem = cp->rcomp->decomp_alloc(compressor_options, len);
290 if (!cp->memreq.returned_mem) {
291 cp->memreq.thread_status = ENOSR;
293 cp->memreq.thread_status = 0;
301 /* here's the deal with memory allocation under Digital UNIX.
302 * Some other may also benefit from this...
303 * We can't ask for huge chunks of memory in a context where
304 * the caller can't be put to sleep (like, here.) The alloc
305 * is likely to fail. Instead we do this: the first time we
306 * get called, kick off a thread to do the allocation. Return
307 * immediately to the caller with EAGAIN, as an indication that
308 * they should send down the ioctl again. By the time the
309 * second call comes in it's likely that the memory allocation
310 * thread will have returned with the requested memory. We will
311 * continue to return EAGAIN however until the thread has completed.
312 * When it has, we return zero (and the memory) if the allocator
313 * was successful and ENOSR otherwise.
315 * Callers of the RCOMP and XCOMP ioctls are encouraged (but not
316 * required) to loop for some number of iterations with a small
317 * delay in the loop body (for instance a 1/10-th second "sleep"
330 struct compressor **comp;
331 struct ppp_stats *psp;
332 struct ppp_comp_stats *csp;
333 unsigned char *opt_data;
334 int nxslots, nrslots;
336 cp = (comp_state_t *) q->q_ptr;
338 DPRINT("cp == 0 in ppp_comp_wput\n");
343 switch (mp->b_datap->db_type) {
350 iop = (struct iocblk *) mp->b_rptr;
352 switch (iop->ioc_cmd) {
355 /* set/get CCP state */
356 if (iop->ioc_count != 2 * sizeof(int))
358 if (mp->b_cont == 0) {
359 DPRINT1("ppp_comp_wput/%d: PPPIO_CFLAGS b_cont = 0!\n", cp->unit);
362 flags = ((int *) mp->b_cont->b_rptr)[0];
363 mask = ((int *) mp->b_cont->b_rptr)[1];
364 cp->flags = (cp->flags & ~mask) | (flags & mask);
365 if ((mask & CCP_ISOPEN) && (flags & CCP_ISOPEN) == 0) {
366 if (cp->xstate != NULL) {
367 (*cp->xcomp->comp_free)(cp->xstate);
370 if (cp->rstate != NULL) {
371 (*cp->rcomp->decomp_free)(cp->rstate);
374 cp->flags &= ~CCP_ISUP;
377 iop->ioc_count = sizeof(int);
378 ((int *) mp->b_cont->b_rptr)[0] = cp->flags;
379 mp->b_cont->b_wptr = mp->b_cont->b_rptr + sizeof(int);
384 * Initialize VJ compressor/decompressor
386 if (iop->ioc_count != 2)
388 if (mp->b_cont == 0) {
389 DPRINT1("ppp_comp_wput/%d: PPPIO_VJINIT b_cont = 0!\n", cp->unit);
392 nxslots = mp->b_cont->b_rptr[0] + 1;
393 nrslots = mp->b_cont->b_rptr[1] + 1;
394 if (nxslots > MAX_STATES || nrslots > MAX_STATES)
396 vj_compress_init(&cp->vj_comp, nxslots);
397 cp->vj_last_ierrors = cp->stats.ppp_ierrors;
404 if (iop->ioc_count <= 0)
406 if (mp->b_cont == 0) {
407 DPRINT1("ppp_comp_wput/%d: PPPIO_[XR]COMP b_cont = 0!\n", cp->unit);
410 opt_data = mp->b_cont->b_rptr;
411 len = mp->b_cont->b_wptr - opt_data;
412 if (len > iop->ioc_count)
413 len = iop->ioc_count;
414 if (opt_data[1] < 2 || opt_data[1] > len)
416 for (comp = ppp_compressors; *comp != NULL; ++comp)
417 if ((*comp)->compress_proto == opt_data[0]) {
418 /* here's the handler! */
421 if (iop->ioc_cmd == PPPIO_XCOMP) {
422 /* A previous call may have fetched memory for a compressor
423 * that's now being retired or reset. Free it using it's
424 * mechanism for freeing stuff.
426 if (cp->xstate != NULL) {
427 (*cp->xcomp->comp_free)(cp->xstate);
431 cp->xstate = (*comp)->comp_alloc(opt_data, len);
432 if (cp->xstate == NULL)
435 if (cp->rstate != NULL) {
436 (*cp->rcomp->decomp_free)(cp->rstate);
440 cp->rstate = (*comp)->decomp_alloc(opt_data, len);
441 if (cp->rstate == NULL)
445 if ((error = cp->memreq.thread_status) != EAGAIN)
446 if (iop->ioc_cmd == PPPIO_XCOMP) {
448 (*cp->xcomp->comp_free)(cp->xstate);
451 /* sanity check for compressor options
453 if (sizeof (cp->memreq.comp_opts) < len) {
454 printf("can't handle options for compressor %d (%d)\n", opt_data[0],
456 cp->memreq.thread_status = ENOSR;
457 cp->memreq.returned_mem = 0;
459 /* fill in request for the thread and kick it off
461 if (cp->memreq.thread_status == 0 && !cp->memreq.returned_mem) {
462 bcopy(opt_data, cp->memreq.comp_opts, len);
463 cp->memreq.cmd = PPPIO_XCOMP;
465 error = cp->memreq.thread_status = EAGAIN;
466 thread_wakeup((vm_offset_t)&cp->memreq.thread_status);
468 cp->xstate = cp->memreq.returned_mem;
469 cp->memreq.returned_mem = 0;
470 cp->memreq.thread_status = 0;
474 (*cp->rcomp->decomp_free)(cp->rstate);
477 if (sizeof (cp->memreq.comp_opts) < len) {
478 printf("can't handle options for compressor %d (%d)\n", opt_data[0],
480 cp->memreq.thread_status = ENOSR;
481 cp->memreq.returned_mem = 0;
483 if (cp->memreq.thread_status == 0 && !cp->memreq.returned_mem) {
484 bcopy(opt_data, cp->memreq.comp_opts, len);
485 cp->memreq.cmd = PPPIO_RCOMP;
487 error = cp->memreq.thread_status = EAGAIN;
488 thread_wakeup((vm_offset_t)&cp->memreq.thread_status);
490 cp->rstate = cp->memreq.returned_mem;
491 cp->memreq.returned_mem = 0;
492 cp->memreq.thread_status = 0;
502 if ((cp->flags & LAST_MOD) == 0) {
503 error = -1; /* let the ppp_ahdl module handle it */
506 np = allocb(sizeof(struct ppp_stats), BPRI_HI);
514 psp = (struct ppp_stats *) np->b_wptr;
515 np->b_wptr += sizeof(struct ppp_stats);
516 iop->ioc_count = sizeof(struct ppp_stats);
518 psp->vj = cp->vj_comp.stats;
523 np = allocb(sizeof(struct ppp_comp_stats), BPRI_HI);
531 csp = (struct ppp_comp_stats *) np->b_wptr;
532 np->b_wptr += sizeof(struct ppp_comp_stats);
533 iop->ioc_count = sizeof(struct ppp_comp_stats);
534 bzero((caddr_t)csp, sizeof(struct ppp_comp_stats));
536 (*cp->xcomp->comp_stat)(cp->xstate, &csp->c);
538 (*cp->rcomp->decomp_stat)(cp->rstate, &csp->d);
543 if (iop->ioc_count != sizeof(int))
545 if (mp->b_cont == 0) {
546 DPRINT1("ppp_comp_wput/%d: PPPIO_DEBUG b_cont = 0!\n", cp->unit);
549 n = *(int *)mp->b_cont->b_rptr;
550 if (n == PPPDBG_LOG + PPPDBG_COMP) {
551 DPRINT1("ppp_comp%d: debug log enabled\n", cp->unit);
561 cp->flags |= LAST_MOD;
572 else if (error == 0) {
573 mp->b_datap->db_type = M_IOCACK;
576 mp->b_datap->db_type = M_IOCNAK;
577 iop->ioc_error = error;
584 switch (*mp->b_rptr) {
586 cp->mtu = ((unsigned short *)mp->b_rptr)[1];
589 cp->mru = ((unsigned short *)mp->b_rptr)[1];
592 cp->unit = mp->b_rptr[1];
609 mblk_t *mp, *cmp = NULL;
611 int len, proto, type, hlen, code;
613 unsigned char *vjhdr, *dp;
615 cp = (comp_state_t *) q->q_ptr;
617 DPRINT("cp == 0 in ppp_comp_wsrv\n");
621 while ((mp = getq(q)) != 0) {
622 /* assert(mp->b_datap->db_type == M_DATA) */
624 if (!bcanputnext(q,mp->b_band))
634 * First check the packet length and work out what the protocol is.
637 if (len < PPP_HDRLEN) {
638 DPRINT1("ppp_comp_wsrv: bogus short packet (%d)\n", len);
640 cp->stats.ppp_oerrors++;
641 putctl1(RD(q)->q_next, M_CTL, PPPCTL_OERROR);
644 proto = (MSG_BYTE(mp, 2) << 8) + MSG_BYTE(mp, 3);
647 * Make sure we've got enough data in the first mblk
648 * and that we are its only user.
650 if (proto == PPP_CCP)
652 else if (proto == PPP_IP)
653 hlen = PPP_HDRLEN + MAX_IPHDR;
658 if (mp->b_wptr < mp->b_rptr + hlen || mp->b_datap->db_ref > 1) {
661 DPRINT1("ppp_comp_wsrv: pullup failed (%d)\n", hlen);
662 cp->stats.ppp_oerrors++;
663 putctl1(RD(q)->q_next, M_CTL, PPPCTL_OERROR);
669 * Do VJ compression if requested.
671 if (proto == PPP_IP && (cp->flags & COMP_VJC)) {
672 ip = (struct ip *) (mp->b_rptr + PPP_HDRLEN);
673 if (ip->ip_p == IPPROTO_TCP) {
674 type = vj_compress_tcp(ip, len - PPP_HDRLEN, &cp->vj_comp,
675 (cp->flags & COMP_VJCCID), &vjhdr);
677 case TYPE_UNCOMPRESSED_TCP:
678 mp->b_rptr[3] = proto = PPP_VJC_UNCOMP;
680 case TYPE_COMPRESSED_TCP:
681 dp = vjhdr - PPP_HDRLEN;
682 dp[1] = mp->b_rptr[1]; /* copy control field */
683 dp[0] = mp->b_rptr[0]; /* copy address field */
684 dp[2] = 0; /* set protocol field */
685 dp[3] = proto = PPP_VJC_COMP;
693 * Do packet compression if enabled.
695 if (proto == PPP_CCP)
696 ppp_comp_ccp(q, mp, 0);
697 else if (proto != PPP_LCP && (cp->flags & CCP_COMP_RUN)
698 && cp->xstate != NULL) {
700 (*cp->xcomp->compress)(cp->xstate, &cmp, mp, len,
701 (cp->flags & CCP_ISUP? cp->mtu + PPP_HDRLEN: 0));
704 cmp->b_band=mp->b_band;
712 * Do address/control and protocol compression if enabled.
714 if ((cp->flags & COMP_AC)
715 && !(proto == PPP_LCP && LCP_USE_DFLT(mp))) {
716 mp->b_rptr += 2; /* drop the address & ctrl fields */
717 if (proto < 0x100 && (cp->flags & COMP_PROT))
718 ++mp->b_rptr; /* drop the high protocol byte */
719 } else if (proto < 0x100 && (cp->flags & COMP_PROT)) {
720 /* shuffle up the address & ctrl fields */
721 mp->b_rptr[2] = mp->b_rptr[1];
722 mp->b_rptr[1] = mp->b_rptr[0];
726 cp->stats.ppp_opackets++;
727 cp->stats.ppp_obytes += msgdsize(mp);
741 struct ppp_stats *psp;
743 cp = (comp_state_t *) q->q_ptr;
745 DPRINT("cp == 0 in ppp_comp_rput\n");
750 switch (mp->b_datap->db_type) {
757 iop = (struct iocblk *) mp->b_rptr;
758 switch (iop->ioc_cmd) {
761 * Catch this on the way back from the ppp_ahdl module
762 * so we can fill in the VJ stats.
764 if (mp->b_cont == 0 || iop->ioc_count != sizeof(struct ppp_stats))
766 psp = (struct ppp_stats *) mp->b_cont->b_rptr;
767 psp->vj = cp->vj_comp.stats;
774 switch (mp->b_rptr[0]) {
776 ++cp->stats.ppp_ierrors;
779 ++cp->stats.ppp_oerrors;
797 mblk_t *mp, *dmp = NULL, *np;
800 int len, hlen, vjlen;
803 cp = (comp_state_t *) q->q_ptr;
805 DPRINT("cp == 0 in ppp_comp_rsrv\n");
809 while ((mp = getq(q)) != 0) {
810 /* assert(mp->b_datap->db_type == M_DATA) */
811 if (!canputnext(q)) {
817 cp->stats.ppp_ibytes += len;
818 cp->stats.ppp_ipackets++;
821 * First work out the protocol and where the PPP header ends.
824 proto = MSG_BYTE(mp, 0);
825 if (proto == PPP_ALLSTATIONS) {
827 proto = MSG_BYTE(mp, 2);
829 if ((proto & 1) == 0) {
831 proto = (proto << 8) + MSG_BYTE(mp, i);
836 * Now reconstruct a complete, contiguous PPP header at the
837 * start of the packet.
839 if (hlen < ((cp->flags & DECOMP_AC)? 0: 2)
840 + ((cp->flags & DECOMP_PROT)? 1: 2)) {
844 if (mp->b_rptr + hlen > mp->b_wptr) {
845 adjmsg(mp, hlen); /* XXX check this call */
848 if (hlen != PPP_HDRLEN) {
850 * We need to put some bytes on the front of the packet
851 * to make a full-length PPP header.
852 * If we can put them in *mp, we do, otherwise we
853 * tack another mblk on the front.
854 * XXX we really shouldn't need to carry around
855 * the address and control at this stage.
857 dp = mp->b_rptr + hlen - PPP_HDRLEN;
858 if (dp < mp->b_datap->db_base || mp->b_datap->db_ref > 1) {
859 np = allocb(PPP_HDRLEN, BPRI_MED);
866 mp->b_wptr += PPP_HDRLEN;
870 dp[0] = PPP_ALLSTATIONS;
877 * Now see if we have a compressed packet to decompress,
878 * or a CCP packet to take notice of.
880 proto = PPP_PROTOCOL(mp->b_rptr);
881 if (proto == PPP_CCP) {
883 if (mp->b_wptr < mp->b_rptr + len) {
888 ppp_comp_ccp(q, mp, 1);
889 } else if (proto == PPP_COMP) {
890 if ((cp->flags & CCP_ISUP)
891 && (cp->flags & CCP_DECOMP_RUN) && cp->rstate
892 && (cp->flags & CCP_ERR) == 0) {
893 rv = (*cp->rcomp->decompress)(cp->rstate, mp, &dmp);
899 /* no error, but no packet returned either. */
904 cp->flags |= CCP_ERROR;
905 ++cp->stats.ppp_ierrors;
906 putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
908 case DECOMP_FATALERROR:
909 cp->flags |= CCP_FATALERROR;
910 ++cp->stats.ppp_ierrors;
911 putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
915 } else if (cp->rstate && (cp->flags & CCP_DECOMP_RUN)) {
916 (*cp->rcomp->incomp)(cp->rstate, mp);
920 * Now do VJ decompression.
922 proto = PPP_PROTOCOL(mp->b_rptr);
923 if (proto == PPP_VJC_COMP || proto == PPP_VJC_UNCOMP) {
924 len = msgdsize(mp) - PPP_HDRLEN;
925 if ((cp->flags & DECOMP_VJC) == 0 || len <= 0)
929 * Advance past the ppp header.
930 * Here we assume that the whole PPP header is in the first mblk.
933 dp = np->b_rptr + PPP_HDRLEN;
934 if (dp >= mp->b_wptr) {
940 * Make sure we have sufficient contiguous data at this point.
942 hlen = (proto == PPP_VJC_COMP)? MAX_VJHDR: MAX_IPHDR;
945 if (np->b_wptr < dp + hlen || np->b_datap->db_ref > 1) {
946 PULLUP(mp, hlen + PPP_HDRLEN);
950 dp = np->b_rptr + PPP_HDRLEN;
953 if (proto == PPP_VJC_COMP) {
955 * Decompress VJ-compressed packet.
956 * First reset compressor if an input error has occurred.
958 if (cp->stats.ppp_ierrors != cp->vj_last_ierrors) {
959 if (cp->flags & DBGLOG)
960 DPRINT1("ppp%d: resetting VJ\n", cp->unit);
961 vj_uncompress_err(&cp->vj_comp);
962 cp->vj_last_ierrors = cp->stats.ppp_ierrors;
965 vjlen = vj_uncompress_tcp(dp, np->b_wptr - dp, len,
966 &cp->vj_comp, &iphdr, &iphlen);
968 if (cp->flags & DBGLOG)
969 DPRINT2("ppp%d: vj_uncomp_tcp failed, pkt len %d\n",
971 ++cp->vj_last_ierrors; /* so we don't reset next time */
975 /* drop ppp and vj headers off */
980 mp->b_rptr = dp + vjlen;
982 /* allocate a new mblk for the ppp and ip headers */
983 if ((np = allocb(iphlen + PPP_HDRLEN + 4, BPRI_MED)) == 0)
985 dp = np->b_rptr; /* prepend mblk with TCP/IP hdr */
986 dp[0] = PPP_ALLSTATIONS; /* reconstruct PPP header */
990 bcopy((caddr_t)iphdr, (caddr_t)dp + PPP_HDRLEN, iphlen);
991 np->b_wptr = dp + iphlen + PPP_HDRLEN;
994 /* XXX there seems to be a bug which causes panics in strread
995 if we make an mbuf with only the IP header in it :-( */
996 if (mp->b_wptr - mp->b_rptr > 4) {
997 bcopy((caddr_t)mp->b_rptr, (caddr_t)np->b_wptr, 4);
1001 bcopy((caddr_t)mp->b_rptr, (caddr_t)np->b_wptr,
1002 mp->b_wptr - mp->b_rptr);
1003 np->b_wptr += mp->b_wptr - mp->b_rptr;
1004 np->b_cont = mp->b_cont;
1012 * "Decompress" a VJ-uncompressed packet.
1014 cp->vj_last_ierrors = cp->stats.ppp_ierrors;
1015 if (!vj_uncompress_uncomp(dp, hlen, &cp->vj_comp)) {
1016 if (cp->flags & DBGLOG)
1017 DPRINT2("ppp%d: vj_uncomp_uncomp failed, pkt len %d\n",
1019 ++cp->vj_last_ierrors; /* don't need to reset next time */
1022 mp->b_rptr[3] = PPP_IP; /* fix up the PPP protocol field */
1032 cp->stats.ppp_ierrors++;
1033 putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
1040 * Handle a CCP packet being sent or received.
1041 * Here all the data in the packet is in a single mbuf.
1044 ppp_comp_ccp(q, mp, rcvd)
1054 if (len < PPP_HDRLEN + CCP_HDRLEN)
1057 cp = (comp_state_t *) q->q_ptr;
1058 dp = mp->b_rptr + PPP_HDRLEN;
1060 clen = CCP_LENGTH(dp);
1064 switch (CCP_CODE(dp)) {
1068 cp->flags &= ~CCP_ISUP;
1072 if ((cp->flags & (CCP_ISOPEN | CCP_ISUP)) == CCP_ISOPEN
1073 && clen >= CCP_HDRLEN + CCP_OPT_MINLEN
1074 && clen >= CCP_HDRLEN + CCP_OPT_LENGTH(dp + CCP_HDRLEN)) {
1076 if (cp->xstate != NULL
1077 && (*cp->xcomp->comp_init)
1078 (cp->xstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN,
1079 cp->unit, 0, ((cp->flags & DBGLOG) != 0)))
1080 cp->flags |= CCP_COMP_RUN;
1082 if (cp->rstate != NULL
1083 && (*cp->rcomp->decomp_init)
1084 (cp->rstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN,
1085 cp->unit, 0, cp->mru, ((cp->flags & DBGLOG) != 0)))
1086 cp->flags = (cp->flags & ~CCP_ERR) | CCP_DECOMP_RUN;
1092 if (cp->flags & CCP_ISUP) {
1094 if (cp->xstate && (cp->flags & CCP_COMP_RUN))
1095 (*cp->xcomp->comp_reset)(cp->xstate);
1097 if (cp->rstate && (cp->flags & CCP_DECOMP_RUN)) {
1098 (*cp->rcomp->decomp_reset)(cp->rstate);
1099 cp->flags &= ~CCP_ERROR;
1115 DPRINT2("mp=%x cont=%x ", mp, mp->b_cont);
1116 DPRINT3("rptr=%x wptr=%x datap=%x\n", mp->b_rptr, mp->b_wptr, db);
1117 DPRINT2(" base=%x lim=%x", db->db_base, db->db_lim);
1118 DPRINT2(" ref=%d type=%d\n", db->db_ref, db->db_type);
1129 while (mp != 0 && i >= mp->b_wptr - mp->b_rptr)
1133 return mp->b_rptr[i];