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 1.5 1996/08/28 06:36:30 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 = {
82 PPP_COMP_ID, "ppp_comp", 0, INFPSZ, 16384, 4096,
85 static struct qinit r_init = {
86 ppp_comp_rput, ppp_comp_rsrv, ppp_comp_open, ppp_comp_close,
90 static struct qinit w_init = {
91 ppp_comp_wput, ppp_comp_wsrv, NULL, NULL, NULL, &minfo, NULL
94 struct streamtab ppp_compinfo = {
95 &r_init, &w_init, NULL, NULL
98 int ppp_comp_count; /* number of module instances in use */
102 static void ppp_comp_alloc __P((comp_state_t *));
103 typedef struct memreq {
113 typedef struct comp_state {
118 struct compressor *xcomp;
120 struct compressor *rcomp;
122 struct vjcompress vj_comp;
124 struct pppstat stats;
133 extern task_t first_task;
136 /* Bits in flags are as defined in pppio.h. */
137 #define CCP_ERR (CCP_ERROR | CCP_FATALERROR)
138 #define LAST_MOD 0x1000000 /* no ppp modules below us */
139 #define DBGLOG 0x2000000 /* log debugging stuff */
141 #define MAX_IPHDR 128 /* max TCP/IP header size */
142 #define MAX_VJHDR 20 /* max VJ compressed header size (?) */
144 #undef MIN /* just in case */
145 #define MIN(a, b) ((a) < (b)? (a): (b))
148 * List of compressors we know about.
151 extern struct compressor ppp_bsd_compress;
152 extern struct compressor ppp_deflate;
154 struct compressor *ppp_compressors[] = {
165 * STREAMS module entry points.
167 MOD_OPEN(ppp_comp_open)
174 if (q->q_ptr == NULL) {
175 cp = (comp_state_t *) ALLOC_SLEEP(sizeof(comp_state_t));
178 WR(q)->q_ptr = q->q_ptr = (caddr_t) cp;
179 bzero((caddr_t)cp, sizeof(comp_state_t));
184 vj_compress_init(&cp->vj_comp, -1);
188 if (!(thread = kernel_thread_w_arg(first_task, ppp_comp_alloc, (void *)cp)))
196 MOD_CLOSE(ppp_comp_close)
201 cp = (comp_state_t *) q->q_ptr;
203 if (cp->xstate != NULL)
204 (*cp->xcomp->comp_free)(cp->xstate);
205 if (cp->rstate != NULL)
206 (*cp->rcomp->decomp_free)(cp->rstate);
209 printf("ppp_comp_close: NULL thread!\n");
211 thread_deallocate(cp->thread);
213 FREE(cp, sizeof(comp_state_t));
215 OTHERQ(q)->q_ptr = NULL;
223 /* thread for calling back to a compressor's memory allocator
224 * Needed for Digital UNIX since it's VM can't handle requests
225 * for large amounts of memory without blocking. The thread
226 * provides a context in which we can call a memory allocator
230 ppp_comp_alloc(comp_state_t *cp)
232 unsigned char *opt_data;
234 struct compressor *comp;
237 #if (MAJOR_VERSION <= 2)
239 /* In 2.x and earlier the argument gets passed
240 * in the thread structure itself. Yuck.
242 thread = current_thread();
243 cp = thread->reply_port;
244 thread->reply_port = PORT_NULL;
249 assert_wait((vm_offset_t)&cp->memreq.comp, TRUE);
251 opt_data = cp->memreq.comp;
252 len = cp->memreq.len;
253 cmd = cp->memreq.cmd;
255 if (cmd == PPPIO_XCOMP) {
257 cp->memreq.mem = (*comp->comp_alloc)(opt_data, len);
260 cp->memreq.mem = (*comp->decomp_alloc)(opt_data, len);
263 cp->memreq.ret = ENOSR;
265 bcopy(opt_data, cp->memreq.mem, len);
267 /* have to free thunk here, since there's
268 * no guarantee that the user will call the ioctl
269 * again if we've taken a long time to complete
278 /* here's the deal with memory allocation under Digital UNIX.
279 * Some other may also benefit from this...
280 * We can't ask for huge chunks of memory in a context where
281 * the caller can't be put to sleep (like, here.) The alloc
282 * is likely to fail. Instead we do this: the first time we
283 * get called, kick off a thread to do the allocation. Return
284 * immediately to the caller with EAGAIN, as an indication that
285 * they should send down the ioctl again. By the time the
286 * second call comes in it's likely that the memory allocation
287 * thread will have returned with the requested memory. We will
288 * continue to return EAGAIN however until the thread has completed.
289 * When it has, we return zero (and the memory) if the allocator
290 * was successful and ENOSR otherwise.
292 * Callers of the RCOMP and XCOMP ioctls are encouraged (but not
293 * required) to loop for some number of iterations with a small
294 * delay in the loop body (for instance a 1/10-th second "sleep"
307 struct compressor **comp;
308 struct ppp_stats *psp;
309 struct ppp_comp_stats *csp;
310 unsigned char *opt_data;
311 int nxslots, nrslots;
313 cp = (comp_state_t *) q->q_ptr;
314 switch (mp->b_datap->db_type) {
321 iop = (struct iocblk *) mp->b_rptr;
323 switch (iop->ioc_cmd) {
326 /* set/get CCP state */
327 if (iop->ioc_count != 2 * sizeof(int))
329 flags = ((int *) mp->b_cont->b_rptr)[0];
330 mask = ((int *) mp->b_cont->b_rptr)[1];
331 cp->flags = (cp->flags & ~mask) | (flags & mask);
332 if ((mask & CCP_ISOPEN) && (flags & CCP_ISOPEN) == 0) {
333 if (cp->xstate != NULL) {
334 (*cp->xcomp->comp_free)(cp->xstate);
337 if (cp->rstate != NULL) {
338 (*cp->rcomp->decomp_free)(cp->rstate);
341 cp->flags &= ~CCP_ISUP;
344 iop->ioc_count = sizeof(int);
345 ((int *) mp->b_cont->b_rptr)[0] = cp->flags;
346 mp->b_cont->b_wptr = mp->b_cont->b_rptr + sizeof(int);
351 * Initialize VJ compressor/decompressor
353 if (iop->ioc_count != 2)
355 nxslots = mp->b_cont->b_rptr[0] + 1;
356 nrslots = mp->b_cont->b_rptr[1] + 1;
357 if (nxslots > MAX_STATES || nrslots > MAX_STATES)
359 vj_compress_init(&cp->vj_comp, nxslots);
360 cp->vj_last_ierrors = cp->stats.ppp_ierrors;
367 if (iop->ioc_count <= 0)
369 opt_data = mp->b_cont->b_rptr;
370 len = mp->b_cont->b_wptr - opt_data;
371 if (len > iop->ioc_count)
372 len = iop->ioc_count;
373 if (opt_data[1] < 2 || opt_data[1] > len)
375 for (comp = ppp_compressors; *comp != NULL; ++comp)
376 if ((*comp)->compress_proto == opt_data[0]) {
377 /* here's the handler! */
379 if (iop->ioc_cmd == PPPIO_XCOMP) {
381 /* A previous call may have fetched memory for a compressor
382 * that's now being retired or reset. Free it using it's
383 * mechanism for freeing stuff.
385 if (cp->xstate != NULL) {
386 (*cp->xcomp->comp_free)(cp->xstate);
391 /* Account for an orpahned call to get memory.
392 * Free that memory up and go on.
394 * The trick is that we need to be able to tell
395 * the difference between an old call that kicked
396 * off a thread where the memory was subsequently
397 * orphaned, and the memory we're really interested
398 * in. The thread helps by stamping the memory it
399 * allocated with the parameters for the compressor
400 * it belongs to. If the parameters match then this
401 * is the memory we want (whether it was an actual
402 * orphan or not we don't care.) If the parameters
403 * don't match then this is an orphan.
405 * Note that cp->memreq.ret is the synchronization
406 * point: we set it to EAGAIN in this function, then
407 * wait for the thread to set it to something other
408 * than EAGAIN before we fool with the data structure
409 * again. Basically, if ret != EAGAIN then the thread
410 * is working and it owns the memreq struture.
412 if (cp->memreq.ret == 0 && cp->memreq.mem != NULL &&
413 bcmp(cp->memreq.mem, opt_data, len)) {
414 (*cp->xcomp->comp_free)(cp->memreq.mem);
418 /* First time through, prime the pump and kick
419 * off the thread. Subsequent times though, the thread
420 * is either busy (ret == EAGAIN) or finsihed (mem != NULL)
423 if (cp->memreq.ret == 0 && cp->memreq.mem == NULL) {
424 cp->memreq.comp = ALLOC_NOSLEEP(len);
425 if (!cp->memreq.comp) {
426 printf("gack! can't get memory for thunk\n");
429 bcopy(opt_data, cp->memreq.comp, len);
430 cp->memreq.len = len;
431 cp->memreq.cmd = PPPIO_XCOMP;
433 cp->memreq.ret = EAGAIN;
434 thread_wakeup((vm_offset_t)&cp->memreq.comp);
437 /* Collect results from the thread, and reset the
438 * mechanism for the next attempt to allocate memory
439 * If the thread isn't finished (ret == EAGAIN) then
440 * don't reset and just return.
442 if ((error = cp->memreq.ret) != EAGAIN) {
443 cp->xstate = cp->memreq.mem;
449 cp->xstate = (*comp)->comp_alloc(opt_data, len);
450 if (cp->xstate == NULL)
454 if (cp->rstate != NULL) {
455 (*cp->rcomp->decomp_free)(cp->rstate);
459 if (cp->memreq.ret == 0 && cp->memreq.mem != NULL &&
460 bcmp(cp->memreq.mem, opt_data, len)) {
461 (*cp->rcomp->comp_free)(cp->memreq.mem);
464 if (cp->memreq.ret == 0 && cp->memreq.mem == NULL) {
465 cp->memreq.comp = ALLOC_NOSLEEP(len);
466 if (!cp->memreq.comp) {
467 printf("gack! can't get memory for thunk\n");
470 bcopy(opt_data, cp->memreq.comp, len);
471 cp->memreq.len = len;
472 cp->memreq.cmd = PPPIO_RCOMP;
474 cp->memreq.ret = EAGAIN;
475 thread_wakeup((vm_offset_t)&cp->memreq.comp);
477 if ((error = cp->memreq.ret) != EAGAIN) {
478 cp->rstate = cp->memreq.mem;
484 cp->rstate = (*comp)->decomp_alloc(opt_data, len);
485 if (cp->rstate == NULL)
495 if ((cp->flags & LAST_MOD) == 0) {
496 error = -1; /* let the ppp_ahdl module handle it */
499 np = allocb(sizeof(struct ppp_stats), BPRI_HI);
507 psp = (struct ppp_stats *) np->b_wptr;
508 np->b_wptr += sizeof(struct ppp_stats);
509 iop->ioc_count = sizeof(struct ppp_stats);
511 psp->vj = cp->vj_comp.stats;
516 np = allocb(sizeof(struct ppp_comp_stats), BPRI_HI);
524 csp = (struct ppp_comp_stats *) np->b_wptr;
525 np->b_wptr += sizeof(struct ppp_comp_stats);
526 iop->ioc_count = sizeof(struct ppp_comp_stats);
527 bzero((caddr_t)csp, sizeof(struct ppp_comp_stats));
529 (*cp->xcomp->comp_stat)(cp->xstate, &csp->c);
531 (*cp->rcomp->decomp_stat)(cp->rstate, &csp->d);
536 if (iop->ioc_count != sizeof(int))
538 n = *(int *)mp->b_cont->b_rptr;
539 if (n == PPPDBG_LOG + PPPDBG_COMP) {
540 DPRINT1("ppp_comp%d: debug log enabled\n", cp->unit);
550 cp->flags |= LAST_MOD;
561 else if (error == 0) {
562 mp->b_datap->db_type = M_IOCACK;
565 mp->b_datap->db_type = M_IOCNAK;
566 iop->ioc_error = error;
573 switch (*mp->b_rptr) {
575 cp->mtu = ((unsigned short *)mp->b_rptr)[1];
578 cp->mru = ((unsigned short *)mp->b_rptr)[1];
581 cp->unit = mp->b_rptr[1];
596 mblk_t *mp, *cmp = NULL, *np;
598 int len, proto, type, hlen, code;
600 unsigned char *vjhdr, *dp;
602 cp = (comp_state_t *) q->q_ptr;
603 while ((mp = getq(q)) != 0) {
604 /* assert(mp->b_datap->db_type == M_DATA) */
605 if (!canputnext(q)) {
611 * First check the packet length and work out what the protocol is.
614 if (len < PPP_HDRLEN) {
615 DPRINT1("ppp_comp_wsrv: bogus short packet (%d)\n", len);
617 cp->stats.ppp_oerrors++;
618 putctl1(RD(q)->q_next, M_CTL, PPPCTL_OERROR);
621 proto = (MSG_BYTE(mp, 2) << 8) + MSG_BYTE(mp, 3);
624 * Make sure we've got enough data in the first mblk
625 * and that we are its only user.
627 if (proto == PPP_CCP)
629 else if (proto == PPP_IP)
630 hlen = PPP_HDRLEN + MAX_IPHDR;
635 if (mp->b_wptr < mp->b_rptr + hlen || mp->b_datap->db_ref > 1) {
638 DPRINT1("ppp_comp_wsrv: pullup failed (%d)\n", hlen);
639 cp->stats.ppp_oerrors++;
640 putctl1(RD(q)->q_next, M_CTL, PPPCTL_OERROR);
646 * Do VJ compression if requested.
648 if (proto == PPP_IP && (cp->flags & COMP_VJC)) {
649 ip = (struct ip *) (mp->b_rptr + PPP_HDRLEN);
650 if (ip->ip_p == IPPROTO_TCP) {
651 type = vj_compress_tcp(ip, len - PPP_HDRLEN, &cp->vj_comp,
652 (cp->flags & COMP_VJCCID), &vjhdr);
654 case TYPE_UNCOMPRESSED_TCP:
655 mp->b_rptr[3] = proto = PPP_VJC_UNCOMP;
657 case TYPE_COMPRESSED_TCP:
658 dp = vjhdr - PPP_HDRLEN;
659 dp[1] = mp->b_rptr[1]; /* copy control field */
660 dp[0] = mp->b_rptr[0]; /* copy address field */
661 dp[2] = 0; /* set protocol field */
662 dp[3] = proto = PPP_VJC_COMP;
670 * Do packet compression if enabled.
672 if (proto == PPP_CCP)
673 ppp_comp_ccp(q, mp, 0);
674 else if (proto != PPP_LCP && (cp->flags & CCP_COMP_RUN)
675 && cp->xstate != NULL) {
677 (*cp->xcomp->compress)(cp->xstate, &cmp, mp, len,
678 (cp->flags & CCP_ISUP? cp->mtu: 0));
686 * Do address/control and protocol compression if enabled.
688 if ((cp->flags & COMP_AC)
689 && !(proto == PPP_LCP && LCP_USE_DFLT(mp))) {
690 mp->b_rptr += 2; /* drop the address & ctrl fields */
691 if (proto < 0x100 && (cp->flags & COMP_PROT))
692 ++mp->b_rptr; /* drop the high protocol byte */
693 } else if (proto < 0x100 && (cp->flags & COMP_PROT)) {
694 /* shuffle up the address & ctrl fields */
695 mp->b_rptr[2] = mp->b_rptr[1];
696 mp->b_rptr[1] = mp->b_rptr[0];
700 cp->stats.ppp_opackets++;
701 cp->stats.ppp_obytes += msgdsize(mp);
713 struct ppp_stats *psp;
715 cp = (comp_state_t *) q->q_ptr;
716 switch (mp->b_datap->db_type) {
723 iop = (struct iocblk *) mp->b_rptr;
724 switch (iop->ioc_cmd) {
727 * Catch this on the way back from the ppp_ahdl module
728 * so we can fill in the VJ stats.
730 if (mp->b_cont == 0 || iop->ioc_count != sizeof(struct ppp_stats))
732 psp = (struct ppp_stats *) mp->b_cont->b_rptr;
733 psp->vj = cp->vj_comp.stats;
740 switch (mp->b_rptr[0]) {
742 ++cp->stats.ppp_ierrors;
745 ++cp->stats.ppp_oerrors;
761 mblk_t *mp, *dmp = NULL, *np;
764 int len, hlen, vjlen;
767 cp = (comp_state_t *) q->q_ptr;
768 while ((mp = getq(q)) != 0) {
769 /* assert(mp->b_datap->db_type == M_DATA) */
770 if (!canputnext(q)) {
776 cp->stats.ppp_ibytes += len;
777 cp->stats.ppp_ipackets++;
780 * First work out the protocol and where the PPP header ends.
783 proto = MSG_BYTE(mp, 0);
784 if (proto == PPP_ALLSTATIONS) {
786 proto = MSG_BYTE(mp, 2);
788 if ((proto & 1) == 0) {
790 proto = (proto << 8) + MSG_BYTE(mp, i);
795 * Now reconstruct a complete, contiguous PPP header at the
796 * start of the packet.
798 if (hlen < ((cp->flags & DECOMP_AC)? 0: 2)
799 + ((cp->flags & DECOMP_PROT)? 1: 2)) {
803 if (mp->b_rptr + hlen > mp->b_wptr) {
804 adjmsg(mp, hlen); /* XXX check this call */
807 if (hlen != PPP_HDRLEN) {
809 * We need to put some bytes on the front of the packet
810 * to make a full-length PPP header.
811 * If we can put them in *mp, we do, otherwise we
812 * tack another mblk on the front.
813 * XXX we really shouldn't need to carry around
814 * the address and control at this stage.
816 dp = mp->b_rptr + hlen - PPP_HDRLEN;
817 if (dp < mp->b_datap->db_base || mp->b_datap->db_ref > 1) {
818 np = allocb(PPP_HDRLEN, BPRI_MED);
825 mp->b_wptr += PPP_HDRLEN;
829 dp[0] = PPP_ALLSTATIONS;
836 * Now see if we have a compressed packet to decompress,
837 * or a CCP packet to take notice of.
839 proto = PPP_PROTOCOL(mp->b_rptr);
840 if (proto == PPP_CCP) {
842 if (mp->b_wptr < mp->b_rptr + len) {
847 ppp_comp_ccp(q, mp, 1);
848 } else if (proto == PPP_COMP) {
849 if ((cp->flags & CCP_ISUP)
850 && (cp->flags & CCP_DECOMP_RUN) && cp->rstate
851 && (cp->flags & CCP_ERR) == 0) {
852 rv = (*cp->rcomp->decompress)(cp->rstate, mp, &dmp);
858 /* no error, but no packet returned either. */
863 cp->flags |= CCP_ERROR;
864 ++cp->stats.ppp_ierrors;
865 putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
867 case DECOMP_FATALERROR:
868 cp->flags |= CCP_FATALERROR;
869 ++cp->stats.ppp_ierrors;
870 putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
874 } else if (cp->rstate && (cp->flags & CCP_DECOMP_RUN)) {
875 (*cp->rcomp->incomp)(cp->rstate, mp);
879 * Now do VJ decompression.
881 proto = PPP_PROTOCOL(mp->b_rptr);
882 if (proto == PPP_VJC_COMP || proto == PPP_VJC_UNCOMP) {
883 len = msgdsize(mp) - PPP_HDRLEN;
884 if ((cp->flags & DECOMP_VJC) == 0 || len <= 0)
888 * Advance past the ppp header.
889 * Here we assume that the whole PPP header is in the first mblk.
892 dp = np->b_rptr + PPP_HDRLEN;
893 if (dp >= mp->b_wptr) {
899 * Make sure we have sufficient contiguous data at this point.
901 hlen = (proto == PPP_VJC_COMP)? MAX_VJHDR: MAX_IPHDR;
904 if (np->b_wptr < dp + hlen || np->b_datap->db_ref > 1) {
905 PULLUP(mp, hlen + PPP_HDRLEN);
909 dp = np->b_rptr + PPP_HDRLEN;
912 if (proto == PPP_VJC_COMP) {
914 * Decompress VJ-compressed packet.
915 * First reset compressor if an input error has occurred.
917 if (cp->stats.ppp_ierrors != cp->vj_last_ierrors) {
918 if (cp->flags & DBGLOG)
919 DPRINT1("ppp%d: resetting VJ\n", cp->unit);
920 vj_uncompress_err(&cp->vj_comp);
921 cp->vj_last_ierrors = cp->stats.ppp_ierrors;
924 vjlen = vj_uncompress_tcp(dp, np->b_wptr - dp, len,
925 &cp->vj_comp, &iphdr, &iphlen);
927 if (cp->flags & DBGLOG)
928 DPRINT2("ppp%d: vj_uncomp_tcp failed, pkt len %d\n",
930 ++cp->vj_last_ierrors; /* so we don't reset next time */
934 /* drop ppp and vj headers off */
939 mp->b_rptr = dp + vjlen;
941 /* allocate a new mblk for the ppp and ip headers */
942 if ((np = allocb(iphlen + PPP_HDRLEN + 4, BPRI_MED)) == 0)
944 dp = np->b_rptr; /* prepend mblk with TCP/IP hdr */
945 dp[0] = PPP_ALLSTATIONS; /* reconstruct PPP header */
949 bcopy((caddr_t)iphdr, (caddr_t)dp + PPP_HDRLEN, iphlen);
950 np->b_wptr = dp + iphlen + PPP_HDRLEN;
953 /* XXX there seems to be a bug which causes panics in strread
954 if we make an mbuf with only the IP header in it :-( */
955 if (mp->b_wptr - mp->b_rptr > 4) {
956 bcopy((caddr_t)mp->b_rptr, (caddr_t)np->b_wptr, 4);
960 bcopy((caddr_t)mp->b_rptr, (caddr_t)np->b_wptr,
961 mp->b_wptr - mp->b_rptr);
962 np->b_wptr += mp->b_wptr - mp->b_rptr;
963 np->b_cont = mp->b_cont;
971 * "Decompress" a VJ-uncompressed packet.
973 cp->vj_last_ierrors = cp->stats.ppp_ierrors;
974 if (!vj_uncompress_uncomp(dp, hlen, &cp->vj_comp)) {
975 if (cp->flags & DBGLOG)
976 DPRINT2("ppp%d: vj_uncomp_uncomp failed, pkt len %d\n",
978 ++cp->vj_last_ierrors; /* don't need to reset next time */
981 mp->b_rptr[3] = PPP_IP; /* fix up the PPP protocol field */
991 cp->stats.ppp_ierrors++;
992 putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
997 * Handle a CCP packet being sent or received.
998 * Here all the data in the packet is in a single mbuf.
1001 ppp_comp_ccp(q, mp, rcvd)
1011 if (len < PPP_HDRLEN + CCP_HDRLEN)
1014 cp = (comp_state_t *) q->q_ptr;
1015 dp = mp->b_rptr + PPP_HDRLEN;
1017 clen = CCP_LENGTH(dp);
1021 switch (CCP_CODE(dp)) {
1025 cp->flags &= ~CCP_ISUP;
1029 if ((cp->flags & (CCP_ISOPEN | CCP_ISUP)) == CCP_ISOPEN
1030 && clen >= CCP_HDRLEN + CCP_OPT_MINLEN
1031 && clen >= CCP_HDRLEN + CCP_OPT_LENGTH(dp + CCP_HDRLEN)) {
1033 if (cp->xstate != NULL
1034 && (*cp->xcomp->comp_init)
1035 (cp->xstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN,
1036 cp->unit, 0, ((cp->flags & DBGLOG) != 0)))
1037 cp->flags |= CCP_COMP_RUN;
1039 if (cp->rstate != NULL
1040 && (*cp->rcomp->decomp_init)
1041 (cp->rstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN,
1042 cp->unit, 0, cp->mru, ((cp->flags & DBGLOG) != 0)))
1043 cp->flags = (cp->flags & ~CCP_ERR) | CCP_DECOMP_RUN;
1049 if (cp->flags & CCP_ISUP) {
1051 if (cp->xstate && (cp->flags & CCP_COMP_RUN))
1052 (*cp->xcomp->comp_reset)(cp->xstate);
1054 if (cp->rstate && (cp->flags & CCP_DECOMP_RUN)) {
1055 (*cp->rcomp->decomp_reset)(cp->rstate);
1056 cp->flags &= ~CCP_ERROR;
1072 DPRINT2("mp=%x cont=%x ", mp, mp->b_cont);
1073 DPRINT3("rptr=%x wptr=%x datap=%x\n", mp->b_rptr, mp->b_wptr, db);
1074 DPRINT2(" base=%x lim=%x", db->db_base, db->db_lim);
1075 DPRINT2(" ref=%d type=%d\n", db->db_ref, db->db_type);
1086 while (mp != 0 && i >= mp->b_wptr - mp->b_rptr)
1090 return mp->b_rptr[i];