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 1.10 1999/02/26 10:52:07 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>
46 #include <sys/cmn_err.h>
50 #include <net/ppp_defs.h>
51 #include <net/pppio.h>
56 #include <sys/protosw.h>
59 #include <netinet/in.h>
60 #include <netinet/in_systm.h>
61 #include <netinet/ip.h>
62 #include <net/vjcompress.h>
64 #define PACKETPTR mblk_t *
65 #include <net/ppp-comp.h>
67 MOD_OPEN_DECL(ppp_comp_open);
68 MOD_CLOSE_DECL(ppp_comp_close);
69 static int ppp_comp_rput __P((queue_t *, mblk_t *));
70 static int ppp_comp_rsrv __P((queue_t *));
71 static int ppp_comp_wput __P((queue_t *, mblk_t *));
72 static int ppp_comp_wsrv __P((queue_t *));
73 static void ppp_comp_ccp __P((queue_t *, mblk_t *, int));
74 static int msg_byte __P((mblk_t *, unsigned int));
76 /* Extract byte i of message mp. */
77 #define MSG_BYTE(mp, i) ((i) < (mp)->b_wptr - (mp)->b_rptr? (mp)->b_rptr[i]: \
80 /* Is this LCP packet one we have to transmit using LCP defaults? */
81 #define LCP_USE_DFLT(mp) (1 <= (code = MSG_BYTE((mp), 4)) && code <= 7)
83 #define PPP_COMP_ID 0xbadf
84 static struct module_info minfo = {
86 PPP_COMP_ID, "ppp_comp", 0, INFPSZ, 16512, 16384,
88 PPP_COMP_ID, "ppp_comp", 0, INFPSZ, 16384, 4096,
92 static struct qinit r_init = {
93 ppp_comp_rput, ppp_comp_rsrv, ppp_comp_open, ppp_comp_close,
97 static struct qinit w_init = {
98 ppp_comp_wput, ppp_comp_wsrv, NULL, NULL, NULL, &minfo, NULL
101 #if defined(SVR4) && !defined(SOL2)
103 #define ppp_compinfo pcmpinfo
105 struct streamtab ppp_compinfo = {
106 &r_init, &w_init, NULL, NULL
111 static void ppp_comp_alloc __P((comp_state_t *));
112 typedef struct memreq {
113 unsigned char comp_opts[20];
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, ppp_deflate_draft;
166 struct compressor *ppp_compressors[] = {
178 * STREAMS module entry points.
180 MOD_OPEN(ppp_comp_open)
187 if (q->q_ptr == NULL) {
188 cp = (comp_state_t *) ALLOC_SLEEP(sizeof(comp_state_t));
191 bzero((caddr_t)cp, sizeof(comp_state_t));
192 WR(q)->q_ptr = q->q_ptr = (caddr_t) cp;
197 vj_compress_init(&cp->vj_comp, -1);
199 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_terminate(cp->thread);
225 FREE(cp, sizeof(comp_state_t));
227 OTHERQ(q)->q_ptr = NULL;
234 /* thread for calling back to a compressor's memory allocator
235 * Needed for Digital UNIX since it's VM can't handle requests
236 * for large amounts of memory without blocking. The thread
237 * provides a context in which we can call a memory allocator
241 ppp_comp_alloc(comp_state_t *cp)
244 unsigned char *compressor_options;
246 void *(*comp_allocator)();
249 #if defined(MAJOR_VERSION) && (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.thread_status, TRUE);
264 if (thread_should_halt(current_thread()))
266 cmd = cp->memreq.cmd;
267 compressor_options = &cp->memreq.comp_opts[0];
268 len = compressor_options[1];
269 if (cmd == PPPIO_XCOMP) {
270 cp->memreq.returned_mem = cp->xcomp->comp_alloc(compressor_options, len);
271 if (!cp->memreq.returned_mem) {
272 cp->memreq.thread_status = ENOSR;
274 cp->memreq.thread_status = 0;
277 cp->memreq.returned_mem = cp->rcomp->decomp_alloc(compressor_options, len);
278 if (!cp->memreq.returned_mem) {
279 cp->memreq.thread_status = ENOSR;
281 cp->memreq.thread_status = 0;
289 /* here's the deal with memory allocation under Digital UNIX.
290 * Some other may also benefit from this...
291 * We can't ask for huge chunks of memory in a context where
292 * the caller can't be put to sleep (like, here.) The alloc
293 * is likely to fail. Instead we do this: the first time we
294 * get called, kick off a thread to do the allocation. Return
295 * immediately to the caller with EAGAIN, as an indication that
296 * they should send down the ioctl again. By the time the
297 * second call comes in it's likely that the memory allocation
298 * thread will have returned with the requested memory. We will
299 * continue to return EAGAIN however until the thread has completed.
300 * When it has, we return zero (and the memory) if the allocator
301 * was successful and ENOSR otherwise.
303 * Callers of the RCOMP and XCOMP ioctls are encouraged (but not
304 * required) to loop for some number of iterations with a small
305 * delay in the loop body (for instance a 1/10-th second "sleep"
318 struct compressor **comp;
319 struct ppp_stats *psp;
320 struct ppp_comp_stats *csp;
321 unsigned char *opt_data;
322 int nxslots, nrslots;
324 cp = (comp_state_t *) q->q_ptr;
326 DPRINT("cp == 0 in ppp_comp_wput\n");
331 switch (mp->b_datap->db_type) {
338 iop = (struct iocblk *) mp->b_rptr;
340 switch (iop->ioc_cmd) {
343 /* set/get CCP state */
344 if (iop->ioc_count != 2 * sizeof(int))
346 if (mp->b_cont == 0) {
347 DPRINT1("ppp_comp_wput/%d: PPPIO_CFLAGS b_cont = 0!\n", cp->unit);
350 flags = ((int *) mp->b_cont->b_rptr)[0];
351 mask = ((int *) mp->b_cont->b_rptr)[1];
352 cp->flags = (cp->flags & ~mask) | (flags & mask);
353 if ((mask & CCP_ISOPEN) && (flags & CCP_ISOPEN) == 0) {
354 if (cp->xstate != NULL) {
355 (*cp->xcomp->comp_free)(cp->xstate);
358 if (cp->rstate != NULL) {
359 (*cp->rcomp->decomp_free)(cp->rstate);
362 cp->flags &= ~CCP_ISUP;
365 iop->ioc_count = sizeof(int);
366 ((int *) mp->b_cont->b_rptr)[0] = cp->flags;
367 mp->b_cont->b_wptr = mp->b_cont->b_rptr + sizeof(int);
372 * Initialize VJ compressor/decompressor
374 if (iop->ioc_count != 2)
376 if (mp->b_cont == 0) {
377 DPRINT1("ppp_comp_wput/%d: PPPIO_VJINIT b_cont = 0!\n", cp->unit);
380 nxslots = mp->b_cont->b_rptr[0] + 1;
381 nrslots = mp->b_cont->b_rptr[1] + 1;
382 if (nxslots > MAX_STATES || nrslots > MAX_STATES)
384 vj_compress_init(&cp->vj_comp, nxslots);
385 cp->vj_last_ierrors = cp->stats.ppp_ierrors;
392 if (iop->ioc_count <= 0)
394 if (mp->b_cont == 0) {
395 DPRINT1("ppp_comp_wput/%d: PPPIO_[XR]COMP b_cont = 0!\n", cp->unit);
398 opt_data = mp->b_cont->b_rptr;
399 len = mp->b_cont->b_wptr - opt_data;
400 if (len > iop->ioc_count)
401 len = iop->ioc_count;
402 if (opt_data[1] < 2 || opt_data[1] > len)
404 for (comp = ppp_compressors; *comp != NULL; ++comp)
405 if ((*comp)->compress_proto == opt_data[0]) {
406 /* here's the handler! */
409 if (iop->ioc_cmd == PPPIO_XCOMP) {
410 /* A previous call may have fetched memory for a compressor
411 * that's now being retired or reset. Free it using it's
412 * mechanism for freeing stuff.
414 if (cp->xstate != NULL) {
415 (*cp->xcomp->comp_free)(cp->xstate);
419 cp->xstate = (*comp)->comp_alloc(opt_data, len);
420 if (cp->xstate == NULL)
423 if (cp->rstate != NULL) {
424 (*cp->rcomp->decomp_free)(cp->rstate);
428 cp->rstate = (*comp)->decomp_alloc(opt_data, len);
429 if (cp->rstate == NULL)
433 if ((error = cp->memreq.thread_status) != EAGAIN)
434 if (iop->ioc_cmd == PPPIO_XCOMP) {
436 (*cp->xcomp->comp_free)(cp->xstate);
439 /* sanity check for compressor options
441 if (sizeof (cp->memreq.comp_opts) < len) {
442 printf("can't handle options for compressor %d (%d)\n", opt_data[0],
444 cp->memreq.thread_status = ENOSR;
445 cp->memreq.returned_mem = 0;
447 /* fill in request for the thread and kick it off
449 if (cp->memreq.thread_status == 0 && !cp->memreq.returned_mem) {
450 bcopy(opt_data, cp->memreq.comp_opts, len);
451 cp->memreq.cmd = PPPIO_XCOMP;
453 error = cp->memreq.thread_status = EAGAIN;
454 thread_wakeup((vm_offset_t)&cp->memreq.thread_status);
456 cp->xstate = cp->memreq.returned_mem;
457 cp->memreq.returned_mem = 0;
458 cp->memreq.thread_status = 0;
462 (*cp->rcomp->decomp_free)(cp->rstate);
465 if (sizeof (cp->memreq.comp_opts) < len) {
466 printf("can't handle options for compressor %d (%d)\n", opt_data[0],
468 cp->memreq.thread_status = ENOSR;
469 cp->memreq.returned_mem = 0;
471 if (cp->memreq.thread_status == 0 && !cp->memreq.returned_mem) {
472 bcopy(opt_data, cp->memreq.comp_opts, len);
473 cp->memreq.cmd = PPPIO_RCOMP;
475 error = cp->memreq.thread_status = EAGAIN;
476 thread_wakeup((vm_offset_t)&cp->memreq.thread_status);
478 cp->rstate = cp->memreq.returned_mem;
479 cp->memreq.returned_mem = 0;
480 cp->memreq.thread_status = 0;
490 if ((cp->flags & LAST_MOD) == 0) {
491 error = -1; /* let the ppp_ahdl module handle it */
494 np = allocb(sizeof(struct ppp_stats), BPRI_HI);
502 psp = (struct ppp_stats *) np->b_wptr;
503 np->b_wptr += sizeof(struct ppp_stats);
504 iop->ioc_count = sizeof(struct ppp_stats);
506 psp->vj = cp->vj_comp.stats;
511 np = allocb(sizeof(struct ppp_comp_stats), BPRI_HI);
519 csp = (struct ppp_comp_stats *) np->b_wptr;
520 np->b_wptr += sizeof(struct ppp_comp_stats);
521 iop->ioc_count = sizeof(struct ppp_comp_stats);
522 bzero((caddr_t)csp, sizeof(struct ppp_comp_stats));
524 (*cp->xcomp->comp_stat)(cp->xstate, &csp->c);
526 (*cp->rcomp->decomp_stat)(cp->rstate, &csp->d);
531 if (iop->ioc_count != sizeof(int))
533 if (mp->b_cont == 0) {
534 DPRINT1("ppp_comp_wput/%d: PPPIO_DEBUG b_cont = 0!\n", cp->unit);
537 n = *(int *)mp->b_cont->b_rptr;
538 if (n == PPPDBG_LOG + PPPDBG_COMP) {
539 DPRINT1("ppp_comp%d: debug log enabled\n", cp->unit);
549 cp->flags |= LAST_MOD;
560 else if (error == 0) {
561 mp->b_datap->db_type = M_IOCACK;
564 mp->b_datap->db_type = M_IOCNAK;
565 iop->ioc_error = error;
572 switch (*mp->b_rptr) {
574 cp->mtu = ((unsigned short *)mp->b_rptr)[1];
577 cp->mru = ((unsigned short *)mp->b_rptr)[1];
580 cp->unit = mp->b_rptr[1];
597 mblk_t *mp, *cmp = NULL, *np;
599 int len, proto, type, hlen, code;
601 unsigned char *vjhdr, *dp;
603 cp = (comp_state_t *) q->q_ptr;
605 DPRINT("cp == 0 in ppp_comp_wsrv\n");
609 while ((mp = getq(q)) != 0) {
610 /* assert(mp->b_datap->db_type == M_DATA) */
612 if (!bcanputnext(q,mp->b_band))
622 * First check the packet length and work out what the protocol is.
625 if (len < PPP_HDRLEN) {
626 DPRINT1("ppp_comp_wsrv: bogus short packet (%d)\n", len);
628 cp->stats.ppp_oerrors++;
629 putctl1(RD(q)->q_next, M_CTL, PPPCTL_OERROR);
632 proto = (MSG_BYTE(mp, 2) << 8) + MSG_BYTE(mp, 3);
635 * Make sure we've got enough data in the first mblk
636 * and that we are its only user.
638 if (proto == PPP_CCP)
640 else if (proto == PPP_IP)
641 hlen = PPP_HDRLEN + MAX_IPHDR;
646 if (mp->b_wptr < mp->b_rptr + hlen || mp->b_datap->db_ref > 1) {
649 DPRINT1("ppp_comp_wsrv: pullup failed (%d)\n", hlen);
650 cp->stats.ppp_oerrors++;
651 putctl1(RD(q)->q_next, M_CTL, PPPCTL_OERROR);
657 * Do VJ compression if requested.
659 if (proto == PPP_IP && (cp->flags & COMP_VJC)) {
660 ip = (struct ip *) (mp->b_rptr + PPP_HDRLEN);
661 if (ip->ip_p == IPPROTO_TCP) {
662 type = vj_compress_tcp(ip, len - PPP_HDRLEN, &cp->vj_comp,
663 (cp->flags & COMP_VJCCID), &vjhdr);
665 case TYPE_UNCOMPRESSED_TCP:
666 mp->b_rptr[3] = proto = PPP_VJC_UNCOMP;
668 case TYPE_COMPRESSED_TCP:
669 dp = vjhdr - PPP_HDRLEN;
670 dp[1] = mp->b_rptr[1]; /* copy control field */
671 dp[0] = mp->b_rptr[0]; /* copy address field */
672 dp[2] = 0; /* set protocol field */
673 dp[3] = proto = PPP_VJC_COMP;
681 * Do packet compression if enabled.
683 if (proto == PPP_CCP)
684 ppp_comp_ccp(q, mp, 0);
685 else if (proto != PPP_LCP && (cp->flags & CCP_COMP_RUN)
686 && cp->xstate != NULL) {
688 (*cp->xcomp->compress)(cp->xstate, &cmp, mp, len,
689 (cp->flags & CCP_ISUP? cp->mtu + PPP_HDRLEN: 0));
692 cmp->b_band=mp->b_band;
700 * Do address/control and protocol compression if enabled.
702 if ((cp->flags & COMP_AC)
703 && !(proto == PPP_LCP && LCP_USE_DFLT(mp))) {
704 mp->b_rptr += 2; /* drop the address & ctrl fields */
705 if (proto < 0x100 && (cp->flags & COMP_PROT))
706 ++mp->b_rptr; /* drop the high protocol byte */
707 } else if (proto < 0x100 && (cp->flags & COMP_PROT)) {
708 /* shuffle up the address & ctrl fields */
709 mp->b_rptr[2] = mp->b_rptr[1];
710 mp->b_rptr[1] = mp->b_rptr[0];
714 cp->stats.ppp_opackets++;
715 cp->stats.ppp_obytes += msgdsize(mp);
729 struct ppp_stats *psp;
731 cp = (comp_state_t *) q->q_ptr;
733 DPRINT("cp == 0 in ppp_comp_rput\n");
738 switch (mp->b_datap->db_type) {
745 iop = (struct iocblk *) mp->b_rptr;
746 switch (iop->ioc_cmd) {
749 * Catch this on the way back from the ppp_ahdl module
750 * so we can fill in the VJ stats.
752 if (mp->b_cont == 0 || iop->ioc_count != sizeof(struct ppp_stats))
754 psp = (struct ppp_stats *) mp->b_cont->b_rptr;
755 psp->vj = cp->vj_comp.stats;
762 switch (mp->b_rptr[0]) {
764 ++cp->stats.ppp_ierrors;
767 ++cp->stats.ppp_oerrors;
785 mblk_t *mp, *dmp = NULL, *np;
788 int len, hlen, vjlen;
791 cp = (comp_state_t *) q->q_ptr;
793 DPRINT("cp == 0 in ppp_comp_rsrv\n");
797 while ((mp = getq(q)) != 0) {
798 /* assert(mp->b_datap->db_type == M_DATA) */
799 if (!canputnext(q)) {
805 cp->stats.ppp_ibytes += len;
806 cp->stats.ppp_ipackets++;
809 * First work out the protocol and where the PPP header ends.
812 proto = MSG_BYTE(mp, 0);
813 if (proto == PPP_ALLSTATIONS) {
815 proto = MSG_BYTE(mp, 2);
817 if ((proto & 1) == 0) {
819 proto = (proto << 8) + MSG_BYTE(mp, i);
824 * Now reconstruct a complete, contiguous PPP header at the
825 * start of the packet.
827 if (hlen < ((cp->flags & DECOMP_AC)? 0: 2)
828 + ((cp->flags & DECOMP_PROT)? 1: 2)) {
832 if (mp->b_rptr + hlen > mp->b_wptr) {
833 adjmsg(mp, hlen); /* XXX check this call */
836 if (hlen != PPP_HDRLEN) {
838 * We need to put some bytes on the front of the packet
839 * to make a full-length PPP header.
840 * If we can put them in *mp, we do, otherwise we
841 * tack another mblk on the front.
842 * XXX we really shouldn't need to carry around
843 * the address and control at this stage.
845 dp = mp->b_rptr + hlen - PPP_HDRLEN;
846 if (dp < mp->b_datap->db_base || mp->b_datap->db_ref > 1) {
847 np = allocb(PPP_HDRLEN, BPRI_MED);
854 mp->b_wptr += PPP_HDRLEN;
858 dp[0] = PPP_ALLSTATIONS;
865 * Now see if we have a compressed packet to decompress,
866 * or a CCP packet to take notice of.
868 proto = PPP_PROTOCOL(mp->b_rptr);
869 if (proto == PPP_CCP) {
871 if (mp->b_wptr < mp->b_rptr + len) {
876 ppp_comp_ccp(q, mp, 1);
877 } else if (proto == PPP_COMP) {
878 if ((cp->flags & CCP_ISUP)
879 && (cp->flags & CCP_DECOMP_RUN) && cp->rstate
880 && (cp->flags & CCP_ERR) == 0) {
881 rv = (*cp->rcomp->decompress)(cp->rstate, mp, &dmp);
887 /* no error, but no packet returned either. */
892 cp->flags |= CCP_ERROR;
893 ++cp->stats.ppp_ierrors;
894 putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
896 case DECOMP_FATALERROR:
897 cp->flags |= CCP_FATALERROR;
898 ++cp->stats.ppp_ierrors;
899 putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
903 } else if (cp->rstate && (cp->flags & CCP_DECOMP_RUN)) {
904 (*cp->rcomp->incomp)(cp->rstate, mp);
908 * Now do VJ decompression.
910 proto = PPP_PROTOCOL(mp->b_rptr);
911 if (proto == PPP_VJC_COMP || proto == PPP_VJC_UNCOMP) {
912 len = msgdsize(mp) - PPP_HDRLEN;
913 if ((cp->flags & DECOMP_VJC) == 0 || len <= 0)
917 * Advance past the ppp header.
918 * Here we assume that the whole PPP header is in the first mblk.
921 dp = np->b_rptr + PPP_HDRLEN;
922 if (dp >= mp->b_wptr) {
928 * Make sure we have sufficient contiguous data at this point.
930 hlen = (proto == PPP_VJC_COMP)? MAX_VJHDR: MAX_IPHDR;
933 if (np->b_wptr < dp + hlen || np->b_datap->db_ref > 1) {
934 PULLUP(mp, hlen + PPP_HDRLEN);
938 dp = np->b_rptr + PPP_HDRLEN;
941 if (proto == PPP_VJC_COMP) {
943 * Decompress VJ-compressed packet.
944 * First reset compressor if an input error has occurred.
946 if (cp->stats.ppp_ierrors != cp->vj_last_ierrors) {
947 if (cp->flags & DBGLOG)
948 DPRINT1("ppp%d: resetting VJ\n", cp->unit);
949 vj_uncompress_err(&cp->vj_comp);
950 cp->vj_last_ierrors = cp->stats.ppp_ierrors;
953 vjlen = vj_uncompress_tcp(dp, np->b_wptr - dp, len,
954 &cp->vj_comp, &iphdr, &iphlen);
956 if (cp->flags & DBGLOG)
957 DPRINT2("ppp%d: vj_uncomp_tcp failed, pkt len %d\n",
959 ++cp->vj_last_ierrors; /* so we don't reset next time */
963 /* drop ppp and vj headers off */
968 mp->b_rptr = dp + vjlen;
970 /* allocate a new mblk for the ppp and ip headers */
971 if ((np = allocb(iphlen + PPP_HDRLEN + 4, BPRI_MED)) == 0)
973 dp = np->b_rptr; /* prepend mblk with TCP/IP hdr */
974 dp[0] = PPP_ALLSTATIONS; /* reconstruct PPP header */
978 bcopy((caddr_t)iphdr, (caddr_t)dp + PPP_HDRLEN, iphlen);
979 np->b_wptr = dp + iphlen + PPP_HDRLEN;
982 /* XXX there seems to be a bug which causes panics in strread
983 if we make an mbuf with only the IP header in it :-( */
984 if (mp->b_wptr - mp->b_rptr > 4) {
985 bcopy((caddr_t)mp->b_rptr, (caddr_t)np->b_wptr, 4);
989 bcopy((caddr_t)mp->b_rptr, (caddr_t)np->b_wptr,
990 mp->b_wptr - mp->b_rptr);
991 np->b_wptr += mp->b_wptr - mp->b_rptr;
992 np->b_cont = mp->b_cont;
1000 * "Decompress" a VJ-uncompressed packet.
1002 cp->vj_last_ierrors = cp->stats.ppp_ierrors;
1003 if (!vj_uncompress_uncomp(dp, hlen, &cp->vj_comp)) {
1004 if (cp->flags & DBGLOG)
1005 DPRINT2("ppp%d: vj_uncomp_uncomp failed, pkt len %d\n",
1007 ++cp->vj_last_ierrors; /* don't need to reset next time */
1010 mp->b_rptr[3] = PPP_IP; /* fix up the PPP protocol field */
1020 cp->stats.ppp_ierrors++;
1021 putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
1028 * Handle a CCP packet being sent or received.
1029 * Here all the data in the packet is in a single mbuf.
1032 ppp_comp_ccp(q, mp, rcvd)
1042 if (len < PPP_HDRLEN + CCP_HDRLEN)
1045 cp = (comp_state_t *) q->q_ptr;
1046 dp = mp->b_rptr + PPP_HDRLEN;
1048 clen = CCP_LENGTH(dp);
1052 switch (CCP_CODE(dp)) {
1056 cp->flags &= ~CCP_ISUP;
1060 if ((cp->flags & (CCP_ISOPEN | CCP_ISUP)) == CCP_ISOPEN
1061 && clen >= CCP_HDRLEN + CCP_OPT_MINLEN
1062 && clen >= CCP_HDRLEN + CCP_OPT_LENGTH(dp + CCP_HDRLEN)) {
1064 if (cp->xstate != NULL
1065 && (*cp->xcomp->comp_init)
1066 (cp->xstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN,
1067 cp->unit, 0, ((cp->flags & DBGLOG) != 0)))
1068 cp->flags |= CCP_COMP_RUN;
1070 if (cp->rstate != NULL
1071 && (*cp->rcomp->decomp_init)
1072 (cp->rstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN,
1073 cp->unit, 0, cp->mru, ((cp->flags & DBGLOG) != 0)))
1074 cp->flags = (cp->flags & ~CCP_ERR) | CCP_DECOMP_RUN;
1080 if (cp->flags & CCP_ISUP) {
1082 if (cp->xstate && (cp->flags & CCP_COMP_RUN))
1083 (*cp->xcomp->comp_reset)(cp->xstate);
1085 if (cp->rstate && (cp->flags & CCP_DECOMP_RUN)) {
1086 (*cp->rcomp->decomp_reset)(cp->rstate);
1087 cp->flags &= ~CCP_ERROR;
1103 DPRINT2("mp=%x cont=%x ", mp, mp->b_cont);
1104 DPRINT3("rptr=%x wptr=%x datap=%x\n", mp->b_rptr, mp->b_wptr, db);
1105 DPRINT2(" base=%x lim=%x", db->db_base, db->db_lim);
1106 DPRINT2(" ref=%d type=%d\n", db->db_ref, db->db_type);
1117 while (mp != 0 && i >= mp->b_wptr - mp->b_rptr)
1121 return mp->b_rptr[i];