--- /dev/null
+/*
+ * ppp_comp.c - STREAMS module for kernel-level CCP support.
+ *
+ * Copyright (c) 1994 The Australian National University.
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation is hereby granted, provided that the above copyright
+ * notice appears in all copies. This software is provided without any
+ * warranty, express or implied. The Australian National University
+ * makes no representations about the suitability of this software for
+ * any purpose.
+ *
+ * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
+ * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
+ * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
+ * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
+ * OR MODIFICATIONS.
+ *
+ * $Id: ppp_comp.c,v 1.1 1995/12/18 23:45:09 paulus Exp $
+ */
+
+/*
+ * This file is used under SunOS 4.x, and OSF/1 on DEC Alpha.
+ *
+ * Beware that under OSF/1, the ioctl constants (SIOC*) end up
+ * as 64-bit (long) values, so an ioctl constant should be cast to
+ * int (32 bits) before being compared with the ioc_cmd field of
+ * an iocblk structure.
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/errno.h>
+#include <sys/user.h>
+#include <sys/stream.h>
+#include <sys/stropts.h>
+#include <sys/syslog.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <net/ppp_defs.h>
+#include <net/ppp_str.h>
+
+#ifdef __osf__
+#include <kern/kalloc.h>
+#ifdef FREE
+#undef FREE
+#endif
+#define ALLOCATE(n) kalloc((n))
+#define FREE(p, n) kfree((p), (n))
+#endif
+
+#ifdef sun
+#include <sys/kmem_alloc.h>
+#define ALLOCATE(n) kmem_alloc((n), KMEM_NOSLEEP)
+#define FREE(p, n) kmem_free((p), (n))
+#endif
+
+#define PACKETPTR mblk_t *
+#include <net/ppp-comp.h>
+
+static int ppp_comp_open(), ppp_comp_close();
+static int ppp_comp_rput(), ppp_comp_wput();
+static void ppp_comp_ccp();
+
+static struct module_info minfo = {
+ 0xbadf, "ppp_compress", 0, INFPSZ, 16384, 4096,
+};
+
+static struct qinit r_init = {
+ ppp_comp_rput, NULL, ppp_comp_open, ppp_comp_close,
+ NULL, &minfo, NULL
+};
+
+static struct qinit w_init = {
+ ppp_comp_wput, NULL, NULL, NULL, NULL, &minfo, NULL
+};
+
+struct streamtab ppp_compinfo = {
+ &r_init, &w_init, NULL, NULL
+};
+
+struct ppp_comp_state {
+ int ccp_state;
+ int debug;
+ int mru;
+ struct compressor *xcomp;
+ void *xstate;
+ struct compressor *rcomp;
+ void *rstate;
+};
+
+/* Bits in ccp_state are as defined in ppp_str.h. */
+#define CCP_ERR (CCP_ERROR | CCP_FATALERROR)
+
+/*
+ * List of compressors we know about.
+ */
+
+extern struct compressor ppp_bsd_compress;
+
+struct compressor *ppp_compressors[] = {
+#if DO_BSD_COMPRESS
+ &ppp_bsd_compress,
+#endif
+ NULL
+};
+
+static int
+ppp_comp_open(q, dev, flag, sflag)
+ queue_t *q;
+ dev_t dev;
+ int flag;
+ int sflag;
+{
+ struct ppp_comp_state *cp;
+
+ if (q->q_ptr == NULL) {
+ cp = (struct ppp_comp_state *) ALLOCATE(sizeof(struct ppp_comp_state));
+ if (cp == NULL) {
+ u.u_error = ENOSR;
+ return OPENFAIL;
+ }
+ OTHERQ(q)->q_ptr = q->q_ptr = (caddr_t) cp;
+ cp->ccp_state = 0;
+ cp->debug = 0;
+ cp->mru = PPP_MRU;
+ cp->xstate = NULL;
+ cp->rstate = NULL;
+ }
+ return 0;
+}
+
+static int
+ppp_comp_close(q)
+ queue_t *q;
+{
+ struct ppp_comp_state *cp;
+
+ cp = (struct ppp_comp_state *) q->q_ptr;
+ if (cp != NULL) {
+ if (cp->xstate != NULL)
+ (*cp->xcomp->comp_free)(cp->xstate);
+ if (cp->rstate != NULL)
+ (*cp->rcomp->decomp_free)(cp->rstate);
+ FREE(cp, sizeof(struct ppp_comp_state));
+ q->q_ptr = NULL;
+ OTHERQ(q)->q_ptr = NULL;
+ }
+ return 0;
+}
+
+static int
+ppp_comp_wput(q, mp)
+ queue_t *q;
+ mblk_t *mp;
+{
+ struct iocblk *iop;
+ struct ppp_comp_state *cp;
+ mblk_t *cmp = NULL;
+ int error, len, proto, state;
+ struct ppp_option_data *odp;
+ struct compressor **comp;
+ struct ppp_comp_stats *pcp;
+
+ cp = (struct ppp_comp_state *) q->q_ptr;
+ switch (mp->b_datap->db_type) {
+
+ case M_CTL:
+ switch (*(u_char *) mp->b_rptr) {
+ case IF_GET_CSTATS:
+ freemsg(mp);
+ mp = allocb(sizeof(struct ppp_comp_stats) + sizeof(u_long),
+ BPRI_HI);
+ if (mp != NULL) {
+ mp->b_datap->db_type = M_CTL;
+ *(u_char *) mp->b_wptr = IF_CSTATS;
+ mp->b_wptr += sizeof(u_long); /* should be enough alignment */
+ pcp = (struct ppp_comp_stats *) mp->b_wptr;
+ mp->b_wptr += sizeof(struct ppp_comp_stats);
+ bzero(pcp, sizeof(struct ppp_comp_stats));
+ if (cp->xstate != NULL)
+ (*cp->xcomp->comp_stat)(cp->xstate, &pcp->c);
+ if (cp->rstate != NULL)
+ (*cp->rcomp->decomp_stat)(cp->rstate, &pcp->d);
+ qreply(q, mp);
+ }
+ break;
+ default:
+ putnext(q, mp);
+ }
+ break;
+
+ case M_DATA:
+ /* first find out what the protocol is */
+ if (mp->b_wptr - mp->b_rptr >= PPP_HDRLEN
+ || pullupmsg(mp, PPP_HDRLEN)) {
+ proto = PPP_PROTOCOL(mp->b_rptr);
+ if (proto == PPP_CCP)
+ ppp_comp_ccp(q, mp, 0);
+ else if (proto != PPP_LCP && (cp->ccp_state & CCP_COMP_RUN)
+ && cp->xstate != NULL) {
+ len = msgdsize(mp);
+ (*cp->xcomp->compress)(cp->xstate, &cmp, mp, len,
+ (cp->ccp_state & CCP_ISUP? len: 0));
+ /* XXX we really want the MTU here, not len */
+ if (cmp != NULL) {
+ freemsg(mp);
+ mp = cmp;
+ }
+ }
+ }
+ putnext(q, mp);
+ break;
+
+ case M_IOCTL:
+ iop = (struct iocblk *) mp->b_rptr;
+ error = -1;
+ switch (iop->ioc_cmd) {
+
+ case SIOCSIFCOMP:
+ /* set CCP state */
+ if (iop->ioc_count != sizeof(int)) {
+ error = EINVAL;
+ break;
+ }
+ state = (*(int *) mp->b_cont->b_rptr) & (CCP_ISUP | CCP_ISOPEN);
+ if ((state & CCP_ISOPEN) == 0) {
+ if (cp->xstate != NULL) {
+ (*cp->xcomp->comp_free)(cp->xstate);
+ cp->xstate = NULL;
+ }
+ if (cp->rstate != NULL) {
+ (*cp->rcomp->decomp_free)(cp->rstate);
+ cp->rstate = NULL;
+ }
+ cp->ccp_state = 0;
+ } else {
+ cp->ccp_state = (cp->ccp_state & ~CCP_ISUP) | state;
+ }
+ if (cp->debug)
+ log(LOG_DEBUG, "SIOCSIFCOMP %x, state = %x\n",
+ *(int *) mp->b_cont->b_rptr, cp->ccp_state);
+ error = 0;
+ iop->ioc_count = 0;
+ break;
+
+ case SIOCGIFCOMP:
+ if ((mp->b_cont = allocb(sizeof(int), BPRI_MED)) == NULL) {
+ error = ENOSR;
+ break;
+ }
+ *(int *)mp->b_cont->b_wptr = cp->ccp_state;
+ mp->b_cont->b_wptr += iop->ioc_count = sizeof(int);
+ error = 0;
+ break;
+
+ case SIOCSCOMPRESS:
+ error = EINVAL;
+ if (iop->ioc_count != sizeof(struct ppp_option_data))
+ break;
+ odp = (struct ppp_option_data *) mp->b_cont->b_rptr;
+ len = mp->b_cont->b_wptr - (unsigned char *) odp->opt_data;
+ if (len > odp->length)
+ len = odp->length;
+ if (odp->opt_data[1] < 2 || odp->opt_data[1] > len)
+ break;
+ for (comp = ppp_compressors; *comp != NULL; ++comp)
+ if ((*comp)->compress_proto == odp->opt_data[0]) {
+ /* here's the handler! */
+ error = 0;
+ if (odp->transmit) {
+ if (cp->xstate != NULL)
+ (*cp->xcomp->comp_free)(cp->xstate);
+ cp->xcomp = *comp;
+ cp->xstate = (*comp)->comp_alloc(odp->opt_data, len);
+ if (cp->xstate == NULL)
+ error = ENOSR;
+ } else {
+ if (cp->rstate != NULL)
+ (*cp->rcomp->decomp_free)(cp->rstate);
+ cp->rcomp = *comp;
+ cp->rstate = (*comp)->decomp_alloc(odp->opt_data, len);
+ if (cp->rstate == NULL)
+ error = ENOSR;
+ }
+ if (cp->debug)
+ log(LOG_DEBUG, "SIOCSCOMPRESS %s len=%d\n",
+ odp->transmit? "xmit": "recv", len);
+ break;
+ }
+ iop->ioc_count = 0;
+ break;
+
+ case SIOCSIFDEBUG:
+ /* set our debug flag from this */
+ if (iop->ioc_count == sizeof(int)) {
+ cp->debug = *(int *) mp->b_cont->b_rptr & 1;
+ }
+ break;
+
+ case SIOCSIFMRU:
+ /* remember this value */
+ if (iop->ioc_count == sizeof(int)) {
+ cp->mru = *(int *) mp->b_cont->b_rptr;
+ }
+ break;
+
+ }
+
+ if (error < 0)
+ putnext(q, mp);
+ else if (error == 0) {
+ mp->b_datap->db_type = M_IOCACK;
+ qreply(q, mp);
+ } else {
+ mp->b_datap->db_type = M_IOCNAK;
+ iop->ioc_count = 0;
+ qreply(q, mp);
+ }
+ break;
+
+ default:
+ putnext(q, mp);
+ }
+}
+
+static int
+ppp_comp_rput(q, mp)
+ queue_t *q;
+ mblk_t *mp;
+{
+ int proto, rv;
+ mblk_t *dmp = NULL;
+ struct ppp_comp_state *cp;
+
+ cp = (struct ppp_comp_state *) q->q_ptr;
+ switch (mp->b_datap->db_type) {
+
+ case M_DATA:
+ /* possibly a compressed packet to decompress,
+ or a CCP packet to take notice of. */
+ if (mp->b_wptr - mp->b_rptr >= PPP_HDRLEN
+ || pullupmsg(mp, PPP_HDRLEN)) {
+ proto = PPP_PROTOCOL(mp->b_rptr);
+ if (proto == PPP_CCP)
+ ppp_comp_ccp(q, mp, 1);
+ else if (proto == PPP_COMP) {
+ if ((cp->ccp_state & CCP_ISUP)
+ && (cp->ccp_state & CCP_DECOMP_RUN) && cp->rstate
+ && (cp->ccp_state & CCP_ERR) == 0) {
+ rv = (*cp->rcomp->decompress)(cp->rstate, mp, &dmp);
+ switch (rv) {
+ case DECOMP_OK:
+ freemsg(mp);
+ mp = dmp;
+ /* if mp is now NULL, then there was no error,
+ but no packet returned either. */
+ break;
+ case DECOMP_ERROR:
+ cp->ccp_state |= CCP_ERROR;
+ break;
+ case DECOMP_FATALERROR:
+ cp->ccp_state |= CCP_FATALERROR;
+ break;
+ }
+ }
+ } else if (cp->rstate && (cp->ccp_state & CCP_DECOMP_RUN)) {
+ (*cp->rcomp->incomp)(cp->rstate, mp);
+ }
+ }
+ if (mp != NULL)
+ putnext(q, mp);
+ break;
+
+ default:
+ putnext(q, mp);
+ }
+}
+
+static void
+ppp_comp_ccp(q, mp, rcvd)
+ queue_t *q;
+ mblk_t *mp;
+ int rcvd;
+{
+ int len, clen;
+ struct ppp_comp_state *cp;
+ unsigned char *dp;
+
+ len = msgdsize(mp);
+ if (len < PPP_HDRLEN + CCP_HDRLEN || !pullupmsg(mp, len))
+ return;
+ cp = (struct ppp_comp_state *) q->q_ptr;
+ dp = mp->b_rptr + PPP_HDRLEN;
+ len -= PPP_HDRLEN;
+ clen = CCP_LENGTH(dp);
+ if (clen > len)
+ return;
+ if (cp->debug)
+ log(LOG_DEBUG, "CCP %s: code=%x len=%d\n", rcvd? "rcvd": "sent",
+ CCP_CODE(dp), clen);
+
+ switch (CCP_CODE(dp)) {
+ case CCP_CONFREQ:
+ case CCP_TERMREQ:
+ case CCP_TERMACK:
+ cp->ccp_state &= ~CCP_ISUP;
+ break;
+
+ case CCP_CONFACK:
+ if ((cp->ccp_state & (CCP_ISOPEN | CCP_ISUP)) == CCP_ISOPEN
+ && clen >= CCP_HDRLEN + CCP_OPT_MINLEN
+ && clen >= CCP_HDRLEN + CCP_OPT_LENGTH(dp + CCP_HDRLEN)) {
+ if (!rcvd) {
+ if (cp->xstate != NULL
+ && (*cp->xcomp->comp_init)
+ (cp->xstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN,
+ 0, /* XXX: should be unit */ 0,
+ cp->debug))
+ cp->ccp_state |= CCP_COMP_RUN;
+ } else {
+ if (cp->rstate != NULL
+ && (*cp->rcomp->decomp_init)
+ (cp->rstate, dp + CCP_HDRLEN, clen - CCP_HDRLEN,
+ 0/* unit */, 0, cp->mru, cp->debug))
+ cp->ccp_state = (cp->ccp_state & ~CCP_ERR)
+ | CCP_DECOMP_RUN;
+ }
+ }
+ break;
+
+ case CCP_RESETACK:
+ if (cp->ccp_state & CCP_ISUP) {
+ if (!rcvd) {
+ if (cp->xstate && (cp->ccp_state & CCP_COMP_RUN))
+ (*cp->xcomp->comp_reset)(cp->xstate);
+ } else {
+ if (cp->rstate && (cp->ccp_state & CCP_DECOMP_RUN)) {
+ (*cp->rcomp->decomp_reset)(cp->rstate);
+ cp->ccp_state &= ~CCP_ERROR;
+ }
+ }
+ }
+ break;
+ }
+
+ if (cp->debug)
+ log(LOG_DEBUG, "ccp_state = %x\n", cp->ccp_state);
+}
projects / ppp.git / blobdiff