--- /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 1995/05/10 01:38:47 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/stream.h>
+#include <sys/modctl.h>
+#include <sys/conf.h>
+#include <sys/kmem.h>
+#include <sys/ddi.h>
+#include <sys/sunddi.h>
+#include <net/ppp_defs.h>
+#include <net/ppp_str.h>
+
+#define ALLOCATE(n) kmem_zalloc((n), KM_NOSLEEP)
+#define FREE(p, n) kmem_free((p), (n))
+
+#define PACKETPTR mblk_t *
+#include <net/ppp-comp.h>
+
+static int ppp_comp_open __P((queue_t *, dev_t *, int, int, cred_t *));
+static int ppp_comp_close __P((queue_t *, int, cred_t *));
+static int ppp_comp_rput __P((queue_t *, mblk_t *));
+static int ppp_comp_wput __P((queue_t *, mblk_t *));
+static void ppp_comp_ccp __P((queue_t *, mblk_t *, int));
+
+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
+};
+
+static struct streamtab ppp_compinfo = {
+ &r_init, &w_init, NULL, NULL
+};
+
+static struct fmodsw fsw = {
+ "ppp_comp",
+ &ppp_compinfo,
+ D_NEW | D_MP | D_MTQPAIR
+};
+
+extern struct mod_ops mod_strmodops;
+
+static struct modlstrmod modlstrmod = {
+ &mod_strmodops,
+ "PPP compression module",
+ &fsw
+};
+
+static struct modlinkage modlinkage = {
+ MODREV_1,
+ (void *) &modlstrmod,
+ NULL
+};
+
+struct ppp_comp_state {
+ int flags;
+ int mru;
+ int mtu;
+ struct compressor *xcomp;
+ void *xstate;
+ struct compressor *rcomp;
+ void *rstate;
+ struct vjcompress vj_comp;
+};
+
+/* Bits in flags are as defined in pppio.h. */
+#define CCP_ERR (CCP_ERROR | CCP_FATALERROR)
+
+#define MAX_IPHDR 128 /* max TCP/IP header size */
+#define MAX_VJHDR 20 /* max VJ compressed header size (?) */
+
+/*
+ * 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
+};
+
+/*
+ * Entry points for modloading.
+ */
+int
+_init(void)
+{
+ return mod_install(&modlinkage);
+}
+
+int
+_fini(void)
+{
+ return mod_remove(&modlinkage);
+}
+
+int
+_info(mip)
+ struct modinfo *mip;
+{
+ return mod_info(&modlinkage, mip);
+}
+
+/*
+ * STREAMS module entry points.
+ */
+static int
+ppp_comp_open(q, dev, flag, sflag, credp)
+ queue_t *q;
+ dev_t dev;
+ int flag, sflag;
+ cred_t *credp;
+{
+ struct ppp_comp_state *cp;
+
+ if (q->q_ptr == NULL) {
+ cp = (struct ppp_comp_state *) ALLOCATE(sizeof(struct ppp_comp_state));
+ if (cp == NULL)
+ return ENOSR;
+ OTHERQ(q)->q_ptr = q->q_ptr = cp;
+ cp->flags = 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;
+ 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_DATA:
+ /* first find out what the protocol is */
+ if (mp->b_wptr - mp->b_rptr < PPP_HDRLEN
+ && !pullupmsg(mp, PPP_HDRLEN)) {
+ freemsg(mp); /* give up on it */
+ break;
+ }
+ proto = PPP_PROTOCOL(mp->b_rptr);
+
+ /*
+ * Do VJ compression if requested.
+ */
+ if (proto == PPP_IP && (cp->flags & COMP_VJC)) {
+ len = msgdsize(mp);
+ if (len > MAX_IPHDR + PPP_HDRLEN)
+ len = MAX_IPHDR + PPP_HDRLEN;
+ if (mp->b_wptr - mp->b_rptr >= len || pullupmsg(mp, len)) {
+ ip = (struct ip *) (mp->b_rptr + PPP_HDRLEN);
+ if (ip->ip_p == IPPROTO_TCP) {
+ type = vj_compress_tcp(ip, len - PPP_HDRLEN,
+ cp->vj_comp, (cp->flags & COMP_VJCCID),
+ &vjhdr);
+ switch (type) {
+ case TYPE_UNCOMPRESSED_TCP:
+ mp->b_rptr[3] = proto = PPP_VJC_UNCOMP;
+ break;
+ case TYPE_COMPRESSED_TCP:
+ dp = vjhdr - PPP_HDRLEN;
+ dp[1] = mp->b_rptr[1]; /* copy control field */
+ dp[0] = mp->b_rptr[0]; /* copy address field */
+ dp[2] = 0; /* set protocol field */
+ dp[3] = proto = PPP_VJC_COMP;
+ mp->b_rptr = dp;
+ break;
+ }
+ }
+ }
+ }
+
+ /*
+ * Do packet compression if enabled.
+ */
+ if (proto == PPP_CCP)
+ ppp_comp_ccp(q, mp, 0);
+ else if (proto != PPP_LCP && (cp->flags & CCP_COMP_RUN)
+ && cp->xstate != NULL) {
+ len = msgdsize(mp);
+ (*cp->xcomp->compress)(cp->xstate, &cmp, mp, len,
+ (cp->flags & CCP_ISUP? cp->mtu: 0));
+ if (cmp != NULL) {
+ freemsg(mp);
+ mp = cmp;
+ }
+ }
+
+ /*
+ * Do address/control and protocol compression if enabled.
+ */
+ if (proto != PPP_LCP && (cp->flags & COMP_AC)) {
+ mp->b_rptr += 2; /* drop the address & ctrl fields */
+ if (proto < 0x100 && (cp->flags & COMP_PROT))
+ ++mp->b_rptr; /* drop the high protocol byte */
+ } else if (proto < 0x100 && (cp->flags & COMP_PROT)) {
+ /* shuffle up the address & ctrl fields */
+ mp->b_rptr[2] = mp->b_rptr[1];
+ mp->b_rptr[1] = mp->b_rptr[0];
+ ++mp->b_rptr;
+ }
+
+ putnext(q, mp);
+ break;
+
+ case M_IOCTL:
+ iop = (struct iocblk *) mp->b_rptr;
+ error = -1;
+ switch (iop->ioc_cmd) {
+
+ case PPPIO_CFLAGS:
+ /* 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->flags = 0;
+ } else {
+ cp->flags = (cp->flags & ~CCP_ISUP) | 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->flags;
+ mp->b_cont->b_wptr += iop->ioc_count = sizeof(int);
+ break;
+
+ case PPPIO_COMPRESS:
+ 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;
+ }
+ break;
+ }
+ iop->ioc_count = 0;
+ break;
+
+ case PPPIO_MRU:
+ /* 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;
+ struct ppp_comp_state *cp;
+
+ cp = (struct ppp_comp_state *) q->q_ptr;
+ switch (mp->b_datap->db_type) {
+
+ case M_DATA:
+ /*
+ * First do address/control and protocol "decompression".
+ */
+ len = msgdsize(mp);
+ if (len > PPP_HDRLEN)
+ len = PPP_HDRLEN;
+ if (mp->b_wptr - mp->b_rptr < len && !pullupmsg(mp, len)) {
+ /* XXX reset VJ */
+ freemsg(mp);
+ break;
+ }
+ dp = mp->b_rptr;
+ if (PPP_ADDRESS(dp) == PPP_ALLSTATIONS && PPP_CONTROL(dp) == PPP_UI)
+ dp += 2; /* skip address/control */
+ proto = 0;
+ if ((dp[0] & 1) == 0)
+ proto = *dp++ << 8; /* grab high byte of protocol */
+ proto += *dp++; /* grab low byte of protocol */
+ if (dp > mp->b_wptr) {
+ freemsg(mp); /* short/bogus packet */
+ break;
+ }
+ if ((dp -= PPP_HDRLEN) < mp->b_datap->db_base) {
+ /* yucko, need a new message block */
+ mp->b_rptr = dp;
+ np = allocb(PPP_HDRLEN, BPRI_MED);
+ if (np == 0) {
+ freemsg(mp);
+ break;
+ }
+ linkb(np, mp);
+ mp = np;
+ dp = mp->b_rptr;
+ mp->b_wptr = dp + PPP_HDRLEN;
+ } else
+ mp->b_rptr = dp;
+ dp[0] = PPP_ALLSTATIONS;
+ dp[1] = PPP_UI;
+ dp[2] = proto >> 8;
+ dp[3] = proto;
+
+ /*
+ * Now see if we have a compressed packet to decompress,
+ * or a CCP packet to take notice of.
+ */
+ proto = PPP_PROTOCOL(mp->b_rptr);
+ if (proto == PPP_CCP)
+ ppp_comp_ccp(q, mp, 1);
+ else if (proto == PPP_COMP) {
+ if ((cp->flags & CCP_ISUP)
+ && (cp->flags & CCP_DECOMP_RUN) && cp->rstate
+ && (cp->flags & CCP_ERR) == 0) {
+ rv = (*cp->rcomp->decompress)(cp->rstate, mp, &dmp);
+ if (dmp != NULL) {
+ freemsg(mp);
+ mp = dmp;
+ } else {
+ switch (rv) {
+ case DECOMP_OK:
+ /* no error, but no packet returned */
+ freemsg(mp);
+ mp = NULL;
+ break;
+ case DECOMP_ERROR:
+ cp->flags |= CCP_ERROR;
+ break;
+ case DECOMP_FATALERROR:
+ cp->flags |= CCP_FATALERROR;
+ break;
+ }
+ }
+ }
+ } else if (cp->rstate && (cp->flags & CCP_DECOMP_RUN)) {
+ (*cp->rcomp->incomp)(cp->rstate, mp);
+ }
+
+ /*
+ * Now do VJ decompression.
+ */
+
+ if (mp != NULL)
+ putnext(q, mp);
+ break;
+
+ default:
+ putnext(q, mp);
+ }
+}
+
+/*
+ * Handle a CCP packet being sent or received.
+ */
+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;
+
+ switch (CCP_CODE(dp)) {
+ case CCP_CONFREQ:
+ case CCP_TERMREQ:
+ case CCP_TERMACK:
+ cp->flags &= ~CCP_ISUP;
+ break;
+
+ case CCP_CONFACK:
+ if ((cp->flags & (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, 0))
+ cp->flags |= 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, 0))
+ cp->flags = (cp->flags & ~CCP_ERR)
+ | CCP_DECOMP_RUN;
+ }
+ }
+ break;
+
+ case CCP_RESETACK:
+ if (cp->flags & CCP_ISUP) {
+ if (!rcvd) {
+ if (cp->xstate && (cp->flags & CCP_COMP_RUN))
+ (*cp->xcomp->comp_reset)(cp->xstate);
+ } else {
+ if (cp->rstate && (cp->flags & CCP_DECOMP_RUN)) {
+ (*cp->rcomp->decomp_reset)(cp->rstate);
+ cp->flags &= ~CCP_ERROR;
+ }
+ }
+ }
+ break;
+ }
+
+}
projects / ppp.git / blobdiff