2 * ppp_comp.c - STREAMS module for kernel-level 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 HAVE 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 1.4 1995/04/28 06:13:05 paulus Exp $
30 #include <net/net_globals.h>
31 #include <sys/types.h>
32 #include <sys/param.h>
33 #include <sys/errno.h>
35 #include <sys/stream.h>
36 #include <sys/stropts.h>
37 #include <sys/strconf.h>
38 #include <sys/device.h>
39 #include <sys/syslog.h>
40 #include <sys/socket.h>
42 #include <net/ppp_defs.h>
43 #include <net/ppp_str.h>
45 #define PACKETPTR mblk_t *
46 #include <net/ppp-comp.h>
48 static int ppp_comp_open(), ppp_comp_close();
49 static int ppp_comp_rput(), ppp_comp_wput();
50 static void ppp_comp_ccp();
52 static struct module_info minfo = {
53 0xbadf, "ppp_compress", 0, INFPSZ, 16384, 4096,
56 static struct qinit r_init = {
57 ppp_comp_rput, NULL, ppp_comp_open, ppp_comp_close,
61 static struct qinit w_init = {
62 ppp_comp_wput, NULL, NULL, NULL, NULL, &minfo, NULL
65 struct streamtab ppp_compinfo = {
66 &r_init, &w_init, NULL, NULL
69 struct ppp_comp_state {
73 struct compressor *xcomp;
75 struct compressor *rcomp;
79 /* Bits in ccp_state are as defined in ppp_str.h. */
80 #define CCP_ERR (CCP_ERROR | CCP_FATALERROR)
83 * List of compressors we know about.
86 extern struct compressor ppp_bsd_compress;
88 struct compressor *ppp_compressors[] = {
93 strconf_t pppcompconf = {
94 "pppcomp", &ppp_compinfo, STR_NEW_OPEN, 0, SQLVL_DEFAULT, (void *) 0
97 int pppcomp_load(int cmd, struct uio *uiop)
103 rc = str_install(STR_LOAD_MOD, &pppcompconf);
106 rc = str_install(STR_UNLOAD_MOD, &pppcompconf);
116 ppp_comp_open(q, dev, flag, sflag)
122 struct ppp_comp_state *cp;
124 if (q->q_ptr == NULL) {
125 cp = (struct ppp_comp_state *)
126 xmalloc(sizeof(struct ppp_comp_state), 0, pinned_heap);
130 bzero(cp, sizeof(struct ppp_comp_state));
131 OTHERQ(q)->q_ptr = q->q_ptr = (caddr_t) cp;
145 struct ppp_comp_state *cp;
147 cp = (struct ppp_comp_state *) q->q_ptr;
149 if (cp->xstate != NULL)
150 (*cp->xcomp->comp_free)(cp->xstate);
151 if (cp->rstate != NULL)
152 (*cp->rcomp->decomp_free)(cp->rstate);
153 xmfree(cp, pinned_heap);
155 OTHERQ(q)->q_ptr = NULL;
166 struct ppp_comp_state *cp;
168 int error, len, proto, state;
169 struct ppp_option_data *odp;
170 struct compressor **comp;
171 struct ppp_comp_stats *pcp;
173 cp = (struct ppp_comp_state *) q->q_ptr;
174 switch (mp->b_datap->db_type) {
177 switch (*(u_char *) mp->b_rptr) {
180 mp = allocb(sizeof(struct ppp_comp_stats) + sizeof(u_long),
183 *(u_char *) mp->b_wptr = IF_CSTATS;
184 mp->b_wptr += sizeof(u_long); /* should be enough alignment */
185 pcp = (struct ppp_comp_stats *) mp->b_wptr;
186 mp->b_wptr += sizeof(struct ppp_comp_stats);
187 bzero(pcp, sizeof(struct ppp_comp_stats));
188 if (cp->xstate != NULL)
189 (*cp->xcomp->comp_stat)(cp->xstate, &pcp->c);
190 if (cp->rstate != NULL)
191 (*cp->rcomp->decomp_stat)(cp->rstate, &pcp->d);
201 /* first find out what the protocol is */
202 if (mp->b_wptr - mp->b_rptr >= PPP_HDRLEN
203 || pullupmsg(mp, PPP_HDRLEN)) {
204 proto = PPP_PROTOCOL(mp->b_rptr);
205 if (proto == PPP_CCP)
206 ppp_comp_ccp(q, mp, 0);
207 else if (proto != PPP_LCP && (cp->ccp_state & CCP_COMP_RUN)
208 && cp->xstate != NULL) {
210 (*cp->xcomp->compress)(cp->xstate, &cmp, mp, len,
211 (cp->ccp_state & CCP_ISUP? len: 0));
212 /* XXX we really want the MTU here, not len */
223 iop = (struct iocblk *) mp->b_rptr;
225 switch ((unsigned int)iop->ioc_cmd) {
229 if ((iop->ioc_count != sizeof(int)) &&
230 (iop->ioc_count != TRANSPARENT)) {
234 state = (*(int *) mp->b_cont->b_rptr) & (CCP_ISUP | CCP_ISOPEN);
235 if ((state & CCP_ISOPEN) == 0) {
236 if (cp->xstate != NULL) {
237 (*cp->xcomp->comp_free)(cp->xstate);
240 if (cp->rstate != NULL) {
241 (*cp->rcomp->decomp_free)(cp->rstate);
246 cp->ccp_state = (cp->ccp_state & ~CCP_ISUP) | state;
249 bsdlog(LOG_INFO, "SIOCSIFCOMP %x, state = %x\n",
250 *(int *) mp->b_cont->b_rptr, cp->ccp_state);
256 if ((mp->b_cont = allocb(sizeof(int), BPRI_MED)) == NULL) {
260 *(int *)mp->b_cont->b_wptr = cp->ccp_state;
261 mp->b_cont->b_wptr += iop->ioc_count = sizeof(int);
266 if (iop->ioc_count != TRANSPARENT)
268 odp = *((struct ppp_option_data **) mp->b_cont->b_rptr);
269 len = sizeof(odp->opt_data);
270 if (len > odp->length)
272 if (odp->opt_data[1] < 2 || odp->opt_data[1] > len)
274 for (comp = ppp_compressors; *comp != NULL; ++comp)
275 if ((*comp)->compress_proto == odp->opt_data[0]) {
276 /* here's the handler! */
279 if (cp->xstate != NULL)
280 (*cp->xcomp->comp_free)(cp->xstate);
282 cp->xstate = (*comp)->comp_alloc(odp->opt_data, len);
283 if (cp->xstate == NULL)
286 if (cp->rstate != NULL)
287 (*cp->rcomp->decomp_free)(cp->rstate);
289 cp->rstate = (*comp)->decomp_alloc(odp->opt_data, len);
290 if (cp->rstate == NULL)
294 bsdlog(LOG_INFO, "SIOCSCOMPRESS %s len=%d\n",
295 odp->transmit? "xmit": "recv", len);
302 /* set our debug flag from this */
303 if ((iop->ioc_count == TRANSPARENT) ||
304 (iop->ioc_count == sizeof(int))) {
305 cp->debug = *(int *) mp->b_cont->b_rptr & 1;
310 /* remember this value */
311 if ((iop->ioc_count == TRANSPARENT) ||
312 (iop->ioc_count == sizeof(int))) {
313 cp->mru = *(int *) mp->b_cont->b_rptr;
321 else if (error == 0) {
322 mp->b_datap->db_type = M_IOCACK;
325 mp->b_datap->db_type = M_IOCNAK;
343 struct ppp_comp_state *cp;
345 cp = (struct ppp_comp_state *) q->q_ptr;
346 switch (mp->b_datap->db_type) {
349 /* possibly a compressed packet to decompress,
350 or a CCP packet to take notice of. */
351 if (mp->b_wptr - mp->b_rptr >= PPP_HDRLEN
352 || pullupmsg(mp, PPP_HDRLEN)) {
353 proto = PPP_PROTOCOL(mp->b_rptr);
354 if (proto == PPP_CCP)
355 ppp_comp_ccp(q, mp, 1);
356 else if (proto == PPP_COMP) {
357 if ((cp->ccp_state & CCP_ISUP)
358 && (cp->ccp_state & CCP_DECOMP_RUN) && cp->rstate
359 && (cp->ccp_state & CCP_ERR) == 0) {
360 rv = (*cp->rcomp->decompress)(cp->rstate, mp, &dmp);
367 /* no error, but no packet returned */
372 cp->ccp_state |= CCP_ERROR;
374 case DECOMP_FATALERROR:
375 cp->ccp_state |= CCP_FATALERROR;
380 } else if (cp->rstate && (cp->ccp_state & CCP_DECOMP_RUN)) {
381 (*cp->rcomp->incomp)(cp->rstate, mp);
394 ppp_comp_ccp(q, mp, rcvd)
400 struct ppp_comp_state *cp;
404 if (len < PPP_HDRLEN + CCP_HDRLEN || !pullupmsg(mp, len))
406 cp = (struct ppp_comp_state *) q->q_ptr;
407 dp = mp->b_rptr + PPP_HDRLEN;
409 clen = CCP_LENGTH(dp);
413 bsdlog(LOG_INFO, "CCP %s: code=%x len=%d\n", rcvd? "rcvd": "sent",
416 switch (CCP_CODE(dp)) {
420 cp->ccp_state &= ~CCP_ISUP;
424 if ((cp->ccp_state & (CCP_ISOPEN | CCP_ISUP)) == CCP_ISOPEN
425 && clen >= CCP_HDRLEN + CCP_OPT_MINLEN
426 && clen >= CCP_HDRLEN + CCP_OPT_LENGTH(dp + CCP_HDRLEN)) {
428 if (cp->xstate != NULL
429 && (*cp->xcomp->comp_init)
430 (cp->xstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN,
431 0, /* XXX: should be unit */ 0,
433 cp->ccp_state |= CCP_COMP_RUN;
435 if (cp->rstate != NULL
436 && (*cp->rcomp->decomp_init)
437 (cp->rstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN,
438 0/* unit */, 0, cp->mru, cp->debug))
439 cp->ccp_state = (cp->ccp_state & ~CCP_ERR)
446 if (cp->ccp_state & CCP_ISUP) {
448 if (cp->xstate && (cp->ccp_state & CCP_COMP_RUN))
449 (*cp->xcomp->comp_reset)(cp->xstate);
451 if (cp->rstate && (cp->ccp_state & CCP_DECOMP_RUN)) {
452 (*cp->rcomp->decomp_reset)(cp->rstate);
453 cp->ccp_state &= ~CCP_ERROR;
461 bsdlog(LOG_INFO, "ccp_state = %x\n", cp->ccp_state);