2 * ppp_comp.c - STREAMS module for kernel-level compression and CCP support.
4 * Copyright (c) 1994 The Australian National University.
7 * Permission to use, copy, modify, and distribute this software and its
8 * documentation is hereby granted, provided that the above copyright
9 * notice appears in all copies. This software is provided without any
10 * warranty, express or implied. The Australian National University
11 * makes no representations about the suitability of this software for
14 * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
15 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
17 * THE AUSTRALIAN NATIONAL UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY
20 * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
21 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
22 * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
23 * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
24 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
27 * $Id: ppp_comp.c,v 1.7 1997/03/04 03:31:51 paulus Exp $
31 * This file is used under SVR4, Solaris 2, SunOS 4, and Digital UNIX.
34 #include <sys/types.h>
35 #include <sys/param.h>
36 #include <sys/errno.h>
37 #include <sys/stream.h>
41 #include <sys/cmn_err.h>
47 #include <net/ppp_defs.h>
48 #include <net/pppio.h>
53 #include <sys/protosw.h>
56 #include <netinet/in.h>
57 #include <netinet/in_systm.h>
58 #include <netinet/ip.h>
59 #include <net/vjcompress.h>
61 #define PACKETPTR mblk_t *
62 #include <net/ppp-comp.h>
64 MOD_OPEN_DECL(ppp_comp_open);
65 MOD_CLOSE_DECL(ppp_comp_close);
66 static int ppp_comp_rput __P((queue_t *, mblk_t *));
67 static int ppp_comp_rsrv __P((queue_t *));
68 static int ppp_comp_wput __P((queue_t *, mblk_t *));
69 static int ppp_comp_wsrv __P((queue_t *));
70 static void ppp_comp_ccp __P((queue_t *, mblk_t *, int));
71 static int msg_byte __P((mblk_t *, unsigned int));
73 /* Extract byte i of message mp. */
74 #define MSG_BYTE(mp, i) ((i) < (mp)->b_wptr - (mp)->b_rptr? (mp)->b_rptr[i]: \
77 /* Is this LCP packet one we have to transmit using LCP defaults? */
78 #define LCP_USE_DFLT(mp) (1 <= (code = MSG_BYTE((mp), 4)) && code <= 7)
80 #define PPP_COMP_ID 0xbadf
81 static struct module_info minfo = {
83 PPP_COMP_ID, "ppp_comp", 0, INFPSZ, 16512, 16384,
85 PPP_COMP_ID, "ppp_comp", 0, INFPSZ, 16384, 4096,
89 static struct qinit r_init = {
90 ppp_comp_rput, ppp_comp_rsrv, ppp_comp_open, ppp_comp_close,
94 static struct qinit w_init = {
95 ppp_comp_wput, ppp_comp_wsrv, NULL, NULL, NULL, &minfo, NULL
98 #if defined(SVR4) && !defined(SOL2)
100 #define ppp_compinfo pcmpinfo
102 struct streamtab ppp_compinfo = {
103 &r_init, &w_init, NULL, NULL
106 int ppp_comp_count; /* number of module instances in use */
110 static void ppp_comp_alloc __P((comp_state_t *));
111 typedef struct memreq {
121 typedef struct comp_state {
126 struct compressor *xcomp;
128 struct compressor *rcomp;
130 struct vjcompress vj_comp;
132 struct pppstat stats;
141 extern task_t first_task;
144 /* Bits in flags are as defined in pppio.h. */
145 #define CCP_ERR (CCP_ERROR | CCP_FATALERROR)
146 #define LAST_MOD 0x1000000 /* no ppp modules below us */
147 #define DBGLOG 0x2000000 /* log debugging stuff */
149 #define MAX_IPHDR 128 /* max TCP/IP header size */
150 #define MAX_VJHDR 20 /* max VJ compressed header size (?) */
152 #undef MIN /* just in case */
153 #define MIN(a, b) ((a) < (b)? (a): (b))
156 * List of compressors we know about.
160 extern struct compressor ppp_bsd_compress;
163 extern struct compressor ppp_deflate;
166 struct compressor *ppp_compressors[] = {
177 * STREAMS module entry points.
179 MOD_OPEN(ppp_comp_open)
186 if (q->q_ptr == NULL) {
187 cp = (comp_state_t *) ALLOC_SLEEP(sizeof(comp_state_t));
190 WR(q)->q_ptr = q->q_ptr = (caddr_t) cp;
191 bzero((caddr_t)cp, sizeof(comp_state_t));
196 vj_compress_init(&cp->vj_comp, -1);
200 if (!(thread = kernel_thread_w_arg(first_task, ppp_comp_alloc, (void *)cp)))
208 MOD_CLOSE(ppp_comp_close)
213 cp = (comp_state_t *) q->q_ptr;
215 if (cp->xstate != NULL)
216 (*cp->xcomp->comp_free)(cp->xstate);
217 if (cp->rstate != NULL)
218 (*cp->rcomp->decomp_free)(cp->rstate);
221 printf("ppp_comp_close: NULL thread!\n");
223 thread_deallocate(cp->thread);
225 FREE(cp, sizeof(comp_state_t));
227 OTHERQ(q)->q_ptr = NULL;
235 /* thread for calling back to a compressor's memory allocator
236 * Needed for Digital UNIX since it's VM can't handle requests
237 * for large amounts of memory without blocking. The thread
238 * provides a context in which we can call a memory allocator
242 ppp_comp_alloc(comp_state_t *cp)
244 unsigned char *opt_data;
246 struct compressor *comp;
249 #if (MAJOR_VERSION <= 2)
251 /* In 2.x and earlier the argument gets passed
252 * in the thread structure itself. Yuck.
254 thread = current_thread();
255 cp = thread->reply_port;
256 thread->reply_port = PORT_NULL;
261 assert_wait((vm_offset_t)&cp->memreq.comp, TRUE);
263 opt_data = cp->memreq.comp;
264 len = cp->memreq.len;
265 cmd = cp->memreq.cmd;
267 if (cmd == PPPIO_XCOMP) {
269 cp->memreq.mem = (*comp->comp_alloc)(opt_data, len);
272 cp->memreq.mem = (*comp->decomp_alloc)(opt_data, len);
275 cp->memreq.ret = ENOSR;
277 bcopy(opt_data, cp->memreq.mem, len);
279 /* have to free thunk here, since there's
280 * no guarantee that the user will call the ioctl
281 * again if we've taken a long time to complete
290 /* here's the deal with memory allocation under Digital UNIX.
291 * Some other may also benefit from this...
292 * We can't ask for huge chunks of memory in a context where
293 * the caller can't be put to sleep (like, here.) The alloc
294 * is likely to fail. Instead we do this: the first time we
295 * get called, kick off a thread to do the allocation. Return
296 * immediately to the caller with EAGAIN, as an indication that
297 * they should send down the ioctl again. By the time the
298 * second call comes in it's likely that the memory allocation
299 * thread will have returned with the requested memory. We will
300 * continue to return EAGAIN however until the thread has completed.
301 * When it has, we return zero (and the memory) if the allocator
302 * was successful and ENOSR otherwise.
304 * Callers of the RCOMP and XCOMP ioctls are encouraged (but not
305 * required) to loop for some number of iterations with a small
306 * delay in the loop body (for instance a 1/10-th second "sleep"
319 struct compressor **comp;
320 struct ppp_stats *psp;
321 struct ppp_comp_stats *csp;
322 unsigned char *opt_data;
323 int nxslots, nrslots;
325 cp = (comp_state_t *) q->q_ptr;
326 switch (mp->b_datap->db_type) {
333 iop = (struct iocblk *) mp->b_rptr;
335 switch (iop->ioc_cmd) {
338 /* set/get CCP state */
339 if (iop->ioc_count != 2 * sizeof(int))
341 flags = ((int *) mp->b_cont->b_rptr)[0];
342 mask = ((int *) mp->b_cont->b_rptr)[1];
343 cp->flags = (cp->flags & ~mask) | (flags & mask);
344 if ((mask & CCP_ISOPEN) && (flags & CCP_ISOPEN) == 0) {
345 if (cp->xstate != NULL) {
346 (*cp->xcomp->comp_free)(cp->xstate);
349 if (cp->rstate != NULL) {
350 (*cp->rcomp->decomp_free)(cp->rstate);
353 cp->flags &= ~CCP_ISUP;
356 iop->ioc_count = sizeof(int);
357 ((int *) mp->b_cont->b_rptr)[0] = cp->flags;
358 mp->b_cont->b_wptr = mp->b_cont->b_rptr + sizeof(int);
363 * Initialize VJ compressor/decompressor
365 if (iop->ioc_count != 2)
367 nxslots = mp->b_cont->b_rptr[0] + 1;
368 nrslots = mp->b_cont->b_rptr[1] + 1;
369 if (nxslots > MAX_STATES || nrslots > MAX_STATES)
371 vj_compress_init(&cp->vj_comp, nxslots);
372 cp->vj_last_ierrors = cp->stats.ppp_ierrors;
379 if (iop->ioc_count <= 0)
381 opt_data = mp->b_cont->b_rptr;
382 len = mp->b_cont->b_wptr - opt_data;
383 if (len > iop->ioc_count)
384 len = iop->ioc_count;
385 if (opt_data[1] < 2 || opt_data[1] > len)
387 for (comp = ppp_compressors; *comp != NULL; ++comp)
388 if ((*comp)->compress_proto == opt_data[0]) {
389 /* here's the handler! */
391 if (iop->ioc_cmd == PPPIO_XCOMP) {
393 /* A previous call may have fetched memory for a compressor
394 * that's now being retired or reset. Free it using it's
395 * mechanism for freeing stuff.
397 if (cp->xstate != NULL) {
398 (*cp->xcomp->comp_free)(cp->xstate);
403 /* Account for an orpahned call to get memory.
404 * Free that memory up and go on.
406 * The trick is that we need to be able to tell
407 * the difference between an old call that kicked
408 * off a thread where the memory was subsequently
409 * orphaned, and the memory we're really interested
410 * in. The thread helps by stamping the memory it
411 * allocated with the parameters for the compressor
412 * it belongs to. If the parameters match then this
413 * is the memory we want (whether it was an actual
414 * orphan or not we don't care.) If the parameters
415 * don't match then this is an orphan.
417 * Note that cp->memreq.ret is the synchronization
418 * point: we set it to EAGAIN in this function, then
419 * wait for the thread to set it to something other
420 * than EAGAIN before we fool with the data structure
421 * again. Basically, if ret != EAGAIN then the thread
422 * is working and it owns the memreq struture.
424 if (cp->memreq.ret == 0 && cp->memreq.mem != NULL &&
425 bcmp(cp->memreq.mem, opt_data, len)) {
426 (*cp->xcomp->comp_free)(cp->memreq.mem);
430 /* First time through, prime the pump and kick
431 * off the thread. Subsequent times though, the thread
432 * is either busy (ret == EAGAIN) or finsihed (mem != NULL)
435 if (cp->memreq.ret == 0 && cp->memreq.mem == NULL) {
436 cp->memreq.comp = ALLOC_NOSLEEP(len);
437 if (!cp->memreq.comp) {
438 printf("gack! can't get memory for thunk\n");
441 bcopy(opt_data, cp->memreq.comp, len);
442 cp->memreq.len = len;
443 cp->memreq.cmd = PPPIO_XCOMP;
445 cp->memreq.ret = EAGAIN;
446 thread_wakeup((vm_offset_t)&cp->memreq.comp);
449 /* Collect results from the thread, and reset the
450 * mechanism for the next attempt to allocate memory
451 * If the thread isn't finished (ret == EAGAIN) then
452 * don't reset and just return.
454 if ((error = cp->memreq.ret) != EAGAIN) {
455 cp->xstate = cp->memreq.mem;
461 cp->xstate = (*comp)->comp_alloc(opt_data, len);
462 if (cp->xstate == NULL)
466 if (cp->rstate != NULL) {
467 (*cp->rcomp->decomp_free)(cp->rstate);
471 if (cp->memreq.ret == 0 && cp->memreq.mem != NULL &&
472 bcmp(cp->memreq.mem, opt_data, len)) {
473 (*cp->rcomp->comp_free)(cp->memreq.mem);
476 if (cp->memreq.ret == 0 && cp->memreq.mem == NULL) {
477 cp->memreq.comp = ALLOC_NOSLEEP(len);
478 if (!cp->memreq.comp) {
479 printf("gack! can't get memory for thunk\n");
482 bcopy(opt_data, cp->memreq.comp, len);
483 cp->memreq.len = len;
484 cp->memreq.cmd = PPPIO_RCOMP;
486 cp->memreq.ret = EAGAIN;
487 thread_wakeup((vm_offset_t)&cp->memreq.comp);
489 if ((error = cp->memreq.ret) != EAGAIN) {
490 cp->rstate = cp->memreq.mem;
496 cp->rstate = (*comp)->decomp_alloc(opt_data, len);
497 if (cp->rstate == NULL)
507 if ((cp->flags & LAST_MOD) == 0) {
508 error = -1; /* let the ppp_ahdl module handle it */
511 np = allocb(sizeof(struct ppp_stats), BPRI_HI);
519 psp = (struct ppp_stats *) np->b_wptr;
520 np->b_wptr += sizeof(struct ppp_stats);
521 iop->ioc_count = sizeof(struct ppp_stats);
523 psp->vj = cp->vj_comp.stats;
528 np = allocb(sizeof(struct ppp_comp_stats), BPRI_HI);
536 csp = (struct ppp_comp_stats *) np->b_wptr;
537 np->b_wptr += sizeof(struct ppp_comp_stats);
538 iop->ioc_count = sizeof(struct ppp_comp_stats);
539 bzero((caddr_t)csp, sizeof(struct ppp_comp_stats));
541 (*cp->xcomp->comp_stat)(cp->xstate, &csp->c);
543 (*cp->rcomp->decomp_stat)(cp->rstate, &csp->d);
548 if (iop->ioc_count != sizeof(int))
550 n = *(int *)mp->b_cont->b_rptr;
551 if (n == PPPDBG_LOG + PPPDBG_COMP) {
552 DPRINT1("ppp_comp%d: debug log enabled\n", cp->unit);
562 cp->flags |= LAST_MOD;
573 else if (error == 0) {
574 mp->b_datap->db_type = M_IOCACK;
577 mp->b_datap->db_type = M_IOCNAK;
578 iop->ioc_error = error;
585 switch (*mp->b_rptr) {
587 cp->mtu = ((unsigned short *)mp->b_rptr)[1];
590 cp->mru = ((unsigned short *)mp->b_rptr)[1];
593 cp->unit = mp->b_rptr[1];
608 mblk_t *mp, *cmp = NULL, *np;
610 int len, proto, type, hlen, code;
612 unsigned char *vjhdr, *dp;
614 cp = (comp_state_t *) q->q_ptr;
615 while ((mp = getq(q)) != 0) {
616 /* assert(mp->b_datap->db_type == M_DATA) */
618 if (!bcanputnext(q,mp->b_band)) {
620 if (!canputnext(q)) {
627 * First check the packet length and work out what the protocol is.
630 if (len < PPP_HDRLEN) {
631 DPRINT1("ppp_comp_wsrv: bogus short packet (%d)\n", len);
633 cp->stats.ppp_oerrors++;
634 putctl1(RD(q)->q_next, M_CTL, PPPCTL_OERROR);
637 proto = (MSG_BYTE(mp, 2) << 8) + MSG_BYTE(mp, 3);
640 * Make sure we've got enough data in the first mblk
641 * and that we are its only user.
643 if (proto == PPP_CCP)
645 else if (proto == PPP_IP)
646 hlen = PPP_HDRLEN + MAX_IPHDR;
651 if (mp->b_wptr < mp->b_rptr + hlen || mp->b_datap->db_ref > 1) {
654 DPRINT1("ppp_comp_wsrv: pullup failed (%d)\n", hlen);
655 cp->stats.ppp_oerrors++;
656 putctl1(RD(q)->q_next, M_CTL, PPPCTL_OERROR);
662 * Do VJ compression if requested.
664 if (proto == PPP_IP && (cp->flags & COMP_VJC)) {
665 ip = (struct ip *) (mp->b_rptr + PPP_HDRLEN);
666 if (ip->ip_p == IPPROTO_TCP) {
667 type = vj_compress_tcp(ip, len - PPP_HDRLEN, &cp->vj_comp,
668 (cp->flags & COMP_VJCCID), &vjhdr);
670 case TYPE_UNCOMPRESSED_TCP:
671 mp->b_rptr[3] = proto = PPP_VJC_UNCOMP;
673 case TYPE_COMPRESSED_TCP:
674 dp = vjhdr - PPP_HDRLEN;
675 dp[1] = mp->b_rptr[1]; /* copy control field */
676 dp[0] = mp->b_rptr[0]; /* copy address field */
677 dp[2] = 0; /* set protocol field */
678 dp[3] = proto = PPP_VJC_COMP;
686 * Do packet compression if enabled.
688 if (proto == PPP_CCP)
689 ppp_comp_ccp(q, mp, 0);
690 else if (proto != PPP_LCP && (cp->flags & CCP_COMP_RUN)
691 && cp->xstate != NULL) {
693 (*cp->xcomp->compress)(cp->xstate, &cmp, mp, len,
694 (cp->flags & CCP_ISUP? cp->mtu: 0));
697 cmp->b_band=mp->b_band;
705 * Do address/control and protocol compression if enabled.
707 if ((cp->flags & COMP_AC)
708 && !(proto == PPP_LCP && LCP_USE_DFLT(mp))) {
709 mp->b_rptr += 2; /* drop the address & ctrl fields */
710 if (proto < 0x100 && (cp->flags & COMP_PROT))
711 ++mp->b_rptr; /* drop the high protocol byte */
712 } else if (proto < 0x100 && (cp->flags & COMP_PROT)) {
713 /* shuffle up the address & ctrl fields */
714 mp->b_rptr[2] = mp->b_rptr[1];
715 mp->b_rptr[1] = mp->b_rptr[0];
719 cp->stats.ppp_opackets++;
720 cp->stats.ppp_obytes += msgdsize(mp);
732 struct ppp_stats *psp;
734 cp = (comp_state_t *) q->q_ptr;
735 switch (mp->b_datap->db_type) {
742 iop = (struct iocblk *) mp->b_rptr;
743 switch (iop->ioc_cmd) {
746 * Catch this on the way back from the ppp_ahdl module
747 * so we can fill in the VJ stats.
749 if (mp->b_cont == 0 || iop->ioc_count != sizeof(struct ppp_stats))
751 psp = (struct ppp_stats *) mp->b_cont->b_rptr;
752 psp->vj = cp->vj_comp.stats;
759 switch (mp->b_rptr[0]) {
761 ++cp->stats.ppp_ierrors;
764 ++cp->stats.ppp_oerrors;
780 mblk_t *mp, *dmp = NULL, *np;
783 int len, hlen, vjlen;
786 cp = (comp_state_t *) q->q_ptr;
787 while ((mp = getq(q)) != 0) {
788 /* assert(mp->b_datap->db_type == M_DATA) */
789 if (!canputnext(q)) {
795 cp->stats.ppp_ibytes += len;
796 cp->stats.ppp_ipackets++;
799 * First work out the protocol and where the PPP header ends.
802 proto = MSG_BYTE(mp, 0);
803 if (proto == PPP_ALLSTATIONS) {
805 proto = MSG_BYTE(mp, 2);
807 if ((proto & 1) == 0) {
809 proto = (proto << 8) + MSG_BYTE(mp, i);
814 * Now reconstruct a complete, contiguous PPP header at the
815 * start of the packet.
817 if (hlen < ((cp->flags & DECOMP_AC)? 0: 2)
818 + ((cp->flags & DECOMP_PROT)? 1: 2)) {
822 if (mp->b_rptr + hlen > mp->b_wptr) {
823 adjmsg(mp, hlen); /* XXX check this call */
826 if (hlen != PPP_HDRLEN) {
828 * We need to put some bytes on the front of the packet
829 * to make a full-length PPP header.
830 * If we can put them in *mp, we do, otherwise we
831 * tack another mblk on the front.
832 * XXX we really shouldn't need to carry around
833 * the address and control at this stage.
835 dp = mp->b_rptr + hlen - PPP_HDRLEN;
836 if (dp < mp->b_datap->db_base || mp->b_datap->db_ref > 1) {
837 np = allocb(PPP_HDRLEN, BPRI_MED);
844 mp->b_wptr += PPP_HDRLEN;
848 dp[0] = PPP_ALLSTATIONS;
855 * Now see if we have a compressed packet to decompress,
856 * or a CCP packet to take notice of.
858 proto = PPP_PROTOCOL(mp->b_rptr);
859 if (proto == PPP_CCP) {
861 if (mp->b_wptr < mp->b_rptr + len) {
866 ppp_comp_ccp(q, mp, 1);
867 } else if (proto == PPP_COMP) {
868 if ((cp->flags & CCP_ISUP)
869 && (cp->flags & CCP_DECOMP_RUN) && cp->rstate
870 && (cp->flags & CCP_ERR) == 0) {
871 rv = (*cp->rcomp->decompress)(cp->rstate, mp, &dmp);
877 /* no error, but no packet returned either. */
882 cp->flags |= CCP_ERROR;
883 ++cp->stats.ppp_ierrors;
884 putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
886 case DECOMP_FATALERROR:
887 cp->flags |= CCP_FATALERROR;
888 ++cp->stats.ppp_ierrors;
889 putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
893 } else if (cp->rstate && (cp->flags & CCP_DECOMP_RUN)) {
894 (*cp->rcomp->incomp)(cp->rstate, mp);
898 * Now do VJ decompression.
900 proto = PPP_PROTOCOL(mp->b_rptr);
901 if (proto == PPP_VJC_COMP || proto == PPP_VJC_UNCOMP) {
902 len = msgdsize(mp) - PPP_HDRLEN;
903 if ((cp->flags & DECOMP_VJC) == 0 || len <= 0)
907 * Advance past the ppp header.
908 * Here we assume that the whole PPP header is in the first mblk.
911 dp = np->b_rptr + PPP_HDRLEN;
912 if (dp >= mp->b_wptr) {
918 * Make sure we have sufficient contiguous data at this point.
920 hlen = (proto == PPP_VJC_COMP)? MAX_VJHDR: MAX_IPHDR;
923 if (np->b_wptr < dp + hlen || np->b_datap->db_ref > 1) {
924 PULLUP(mp, hlen + PPP_HDRLEN);
928 dp = np->b_rptr + PPP_HDRLEN;
931 if (proto == PPP_VJC_COMP) {
933 * Decompress VJ-compressed packet.
934 * First reset compressor if an input error has occurred.
936 if (cp->stats.ppp_ierrors != cp->vj_last_ierrors) {
937 if (cp->flags & DBGLOG)
938 DPRINT1("ppp%d: resetting VJ\n", cp->unit);
939 vj_uncompress_err(&cp->vj_comp);
940 cp->vj_last_ierrors = cp->stats.ppp_ierrors;
943 vjlen = vj_uncompress_tcp(dp, np->b_wptr - dp, len,
944 &cp->vj_comp, &iphdr, &iphlen);
946 if (cp->flags & DBGLOG)
947 DPRINT2("ppp%d: vj_uncomp_tcp failed, pkt len %d\n",
949 ++cp->vj_last_ierrors; /* so we don't reset next time */
953 /* drop ppp and vj headers off */
958 mp->b_rptr = dp + vjlen;
960 /* allocate a new mblk for the ppp and ip headers */
961 if ((np = allocb(iphlen + PPP_HDRLEN + 4, BPRI_MED)) == 0)
963 dp = np->b_rptr; /* prepend mblk with TCP/IP hdr */
964 dp[0] = PPP_ALLSTATIONS; /* reconstruct PPP header */
968 bcopy((caddr_t)iphdr, (caddr_t)dp + PPP_HDRLEN, iphlen);
969 np->b_wptr = dp + iphlen + PPP_HDRLEN;
972 /* XXX there seems to be a bug which causes panics in strread
973 if we make an mbuf with only the IP header in it :-( */
974 if (mp->b_wptr - mp->b_rptr > 4) {
975 bcopy((caddr_t)mp->b_rptr, (caddr_t)np->b_wptr, 4);
979 bcopy((caddr_t)mp->b_rptr, (caddr_t)np->b_wptr,
980 mp->b_wptr - mp->b_rptr);
981 np->b_wptr += mp->b_wptr - mp->b_rptr;
982 np->b_cont = mp->b_cont;
990 * "Decompress" a VJ-uncompressed packet.
992 cp->vj_last_ierrors = cp->stats.ppp_ierrors;
993 if (!vj_uncompress_uncomp(dp, hlen, &cp->vj_comp)) {
994 if (cp->flags & DBGLOG)
995 DPRINT2("ppp%d: vj_uncomp_uncomp failed, pkt len %d\n",
997 ++cp->vj_last_ierrors; /* don't need to reset next time */
1000 mp->b_rptr[3] = PPP_IP; /* fix up the PPP protocol field */
1010 cp->stats.ppp_ierrors++;
1011 putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
1016 * Handle a CCP packet being sent or received.
1017 * Here all the data in the packet is in a single mbuf.
1020 ppp_comp_ccp(q, mp, rcvd)
1030 if (len < PPP_HDRLEN + CCP_HDRLEN)
1033 cp = (comp_state_t *) q->q_ptr;
1034 dp = mp->b_rptr + PPP_HDRLEN;
1036 clen = CCP_LENGTH(dp);
1040 switch (CCP_CODE(dp)) {
1044 cp->flags &= ~CCP_ISUP;
1048 if ((cp->flags & (CCP_ISOPEN | CCP_ISUP)) == CCP_ISOPEN
1049 && clen >= CCP_HDRLEN + CCP_OPT_MINLEN
1050 && clen >= CCP_HDRLEN + CCP_OPT_LENGTH(dp + CCP_HDRLEN)) {
1052 if (cp->xstate != NULL
1053 && (*cp->xcomp->comp_init)
1054 (cp->xstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN,
1055 cp->unit, 0, ((cp->flags & DBGLOG) != 0)))
1056 cp->flags |= CCP_COMP_RUN;
1058 if (cp->rstate != NULL
1059 && (*cp->rcomp->decomp_init)
1060 (cp->rstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN,
1061 cp->unit, 0, cp->mru, ((cp->flags & DBGLOG) != 0)))
1062 cp->flags = (cp->flags & ~CCP_ERR) | CCP_DECOMP_RUN;
1068 if (cp->flags & CCP_ISUP) {
1070 if (cp->xstate && (cp->flags & CCP_COMP_RUN))
1071 (*cp->xcomp->comp_reset)(cp->xstate);
1073 if (cp->rstate && (cp->flags & CCP_DECOMP_RUN)) {
1074 (*cp->rcomp->decomp_reset)(cp->rstate);
1075 cp->flags &= ~CCP_ERROR;
1091 DPRINT2("mp=%x cont=%x ", mp, mp->b_cont);
1092 DPRINT3("rptr=%x wptr=%x datap=%x\n", mp->b_rptr, mp->b_wptr, db);
1093 DPRINT2(" base=%x lim=%x", db->db_base, db->db_lim);
1094 DPRINT2(" ref=%d type=%d\n", db->db_ref, db->db_type);
1105 while (mp != 0 && i >= mp->b_wptr - mp->b_rptr)
1109 return mp->b_rptr[i];