--- /dev/null
+/*
+ * ppp_ahdlc.c - STREAMS module for doing PPP asynchronous HDLC.
+ *
+ * Re-written by Adi Masputra <adi.masputra@sun.com>, based on
+ * the original ppp_ahdlc.c
+ *
+ * Copyright (c) 2000 by Sun Microsystems, Inc.
+ * 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.
+ *
+ * SUN MAKES NO REPRESENTATION OR WARRANTIES ABOUT THE SUITABILITY OF
+ * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+ * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES
+ *
+ * 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 HAS 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_ahdlc.c,v 1.1 2000/04/18 23:51:28 masputra Exp $
+ */
+
+/*
+ * This file is used under Solaris 2, SVR4, SunOS 4, and Digital UNIX.
+ */
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stream.h>
+#include <sys/errno.h>
+
+#ifdef SVR4
+#include <sys/conf.h>
+#include <sys/kmem.h>
+#include <sys/cmn_err.h>
+#include <sys/ddi.h>
+#else
+#include <sys/user.h>
+#ifdef __osf__
+#include <sys/cmn_err.h>
+#endif
+#endif /* SVR4 */
+
+#include <net/ppp_defs.h>
+#include <net/pppio.h>
+#include "ppp_mod.h"
+
+/*
+ * Right now, mutex is only enabled for Solaris 2.x
+ */
+#if defined(SOL2)
+#define USE_MUTEX
+#endif /* SOL2 */
+
+/*
+ * intpointer_t and uintpointer_t are signed and unsigned integer types
+ * large enough to hold any data pointer; that is, data pointers can be
+ * assigned into or from these integer types without losing precision.
+ * On recent Solaris releases, these types are defined in sys/int_types.h,
+ * but not on SunOS 4.x or the earlier Solaris versions.
+ */
+#if defined(_LP64) || defined(_I32LPx)
+typedef long intpointer_t;
+typedef unsigned long uintpointer_t;
+#else
+typedef int intpointer_t;
+typedef unsigned int uintpointer_t;
+#endif
+
+MOD_OPEN_DECL(ahdlc_open);
+MOD_CLOSE_DECL(ahdlc_close);
+static int ahdlc_wput __P((queue_t *, mblk_t *));
+static int ahdlc_rput __P((queue_t *, mblk_t *));
+static void ahdlc_encode __P((queue_t *, mblk_t *));
+static void ahdlc_decode __P((queue_t *, mblk_t *));
+static int msg_byte __P((mblk_t *, unsigned int));
+
+#if defined(SOL2)
+/*
+ * Don't send HDLC start flag is last transmit is within 1.5 seconds -
+ * FLAG_TIME is defined is microseconds
+ */
+#define FLAG_TIME 1500
+#define ABS(x) (x >= 0 ? x : (-x))
+#endif /* SOL2 */
+
+/*
+ * Extract byte i of message mp
+ */
+#define MSG_BYTE(mp, i) ((i) < (mp)->b_wptr - (mp)->b_rptr? (mp)->b_rptr[i]: \
+ msg_byte((mp), (i)))
+
+/*
+ * Is this LCP packet one we have to transmit using LCP defaults?
+ */
+#define LCP_USE_DFLT(mp) (1 <= (code = MSG_BYTE((mp), 4)) && code <= 7)
+
+/*
+ * Standard STREAMS declarations
+ */
+static struct module_info minfo = {
+ 0x7d23, "ppp_ahdl", 0, INFPSZ, 32768, 512
+};
+
+static struct qinit rinit = {
+ ahdlc_rput, NULL, ahdlc_open, ahdlc_close, NULL, &minfo, NULL
+};
+
+static struct qinit winit = {
+ ahdlc_wput, NULL, NULL, NULL, NULL, &minfo, NULL
+};
+
+#if defined(SVR4) && !defined(SOL2)
+int phdldevflag = 0;
+#define ppp_ahdlcinfo phdlinfo
+#endif /* defined(SVR4) && !defined(SOL2) */
+
+struct streamtab ppp_ahdlcinfo = {
+ &rinit, /* ptr to st_rdinit */
+ &winit, /* ptr to st_wrinit */
+ NULL, /* ptr to st_muxrinit */
+ NULL, /* ptr to st_muxwinit */
+#if defined(SUNOS4)
+ NULL /* ptr to ptr to st_modlist */
+#endif /* SUNOS4 */
+};
+
+#if defined(SUNOS4)
+int ppp_ahdlc_count = 0; /* open counter */
+#endif /* SUNOS4 */
+
+/*
+ * Per-stream state structure
+ */
+typedef struct ahdlc_state {
+#if defined(USE_MUTEX)
+ kmutex_t lock; /* lock for this structure */
+#endif /* USE_MUTEX */
+ int flags; /* link flags */
+ mblk_t *rx_buf; /* ptr to receive buffer */
+ int rx_buf_size; /* receive buffer size */
+ ushort_t infcs; /* calculated rx HDLC FCS */
+ u_int32_t xaccm[8]; /* 256-bit xmit ACCM */
+ u_int32_t raccm; /* 32-bit rcv ACCM */
+ int mtu; /* interface MTU */
+ int mru; /* link MRU */
+ int unit; /* current PPP unit number */
+ struct pppstat stats; /* statistic structure */
+#if defined(SOL2)
+ clock_t flag_time; /* time in usec between flags */
+ clock_t lbolt; /* last updated lbolt */
+#endif /* SOL2 */
+} ahdlc_state_t;
+
+/*
+ * Values for flags
+ */
+#define ESCAPED 0x100 /* last saw escape char on input */
+#define IFLUSH 0x200 /* flushing input due to error */
+
+/*
+ * RCV_B7_1, etc., defined in net/pppio.h, are stored in flags also.
+ */
+#define RCV_FLAGS (RCV_B7_1|RCV_B7_0|RCV_ODDP|RCV_EVNP)
+
+/*
+ * FCS lookup table as calculated by genfcstab.
+ */
+static u_short fcstab[256] = {
+ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
+ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
+ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
+ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
+ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
+ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
+ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
+ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
+ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
+ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
+ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
+ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
+ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
+ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
+ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
+ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
+ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
+ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
+ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
+ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
+ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
+ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
+ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
+ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
+ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
+ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
+ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
+ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
+ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
+ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
+ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
+ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
+};
+
+static u_int32_t paritytab[8] =
+{
+ 0x96696996, 0x69969669, 0x69969669, 0x96696996,
+ 0x69969669, 0x96696996, 0x96696996, 0x69969669
+};
+
+/*
+ * STREAMS module open (entry) point
+ */
+MOD_OPEN(ahdlc_open)
+{
+ ahdlc_state_t *state;
+
+ /*
+ * Return if it's already opened
+ */
+ if (q->q_ptr) {
+ return 0;
+ }
+
+ /*
+ * This can only be opened as a module
+ */
+ if (sflag != MODOPEN) {
+ return 0;
+ }
+
+ state = (ahdlc_state_t *) ALLOC_NOSLEEP(sizeof(ahdlc_state_t));
+ if (state == 0)
+ OPEN_ERROR(ENOSR);
+ bzero((caddr_t) state, sizeof(ahdlc_state_t));
+
+ q->q_ptr = (caddr_t) state;
+ WR(q)->q_ptr = (caddr_t) state;
+
+#if defined(USE_MUTEX)
+ mutex_init(&state->lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_enter(&state->lock);
+#endif /* USE_MUTEX */
+
+ state->xaccm[0] = ~0; /* escape 0x00 through 0x1f */
+ state->xaccm[3] = 0x60000000; /* escape 0x7d and 0x7e */
+ state->mru = PPP_MRU; /* default of 1500 bytes */
+#if defined(SOL2)
+ state->flag_time = drv_usectohz(FLAG_TIME);
+#endif /* SOL2 */
+
+#if defined(USE_MUTEX)
+ mutex_exit(&state->lock);
+#endif /* USE_MUTEX */
+
+#if defined(SUNOS4)
+ ppp_ahdlc_count++;
+#endif /* SUNOS4 */
+
+ qprocson(q);
+
+ return 0;
+}
+
+/*
+ * STREAMS module close (exit) point
+ */
+MOD_CLOSE(ahdlc_close)
+{
+ ahdlc_state_t *state;
+
+ qprocsoff(q);
+
+ state = (ahdlc_state_t *) q->q_ptr;
+
+ if (state == 0) {
+ DPRINT("state == 0 in ahdlc_close\n");
+ return 0;
+ }
+
+#if defined(USE_MUTEX)
+ mutex_enter(&state->lock);
+#endif /* USE_MUTEX */
+
+ if (state->rx_buf != 0) {
+ freemsg(state->rx_buf);
+ state->rx_buf = 0;
+ }
+
+#if defined(USE_MUTEX)
+ mutex_exit(&state->lock);
+ mutex_destroy(&state->lock);
+#endif /* USE_MUTEX */
+
+ FREE(q->q_ptr, sizeof(ahdlc_state_t));
+ q->q_ptr = NULL;
+ OTHERQ(q)->q_ptr = NULL;
+
+#if defined(SUNOS4)
+ if (ppp_ahdlc_count)
+ ppp_ahdlc_count--;
+#endif /* SUNOS4 */
+
+ return 0;
+}
+
+/*
+ * Write side put routine
+ */
+static int
+ahdlc_wput(q, mp)
+ queue_t *q;
+ mblk_t *mp;
+{
+ ahdlc_state_t *state;
+ struct iocblk *iop;
+ int error;
+ mblk_t *np;
+ struct ppp_stats *psp;
+
+ state = (ahdlc_state_t *) q->q_ptr;
+ if (state == 0) {
+ DPRINT("state == 0 in ahdlc_wput\n");
+ freemsg(mp);
+ return 0;
+ }
+
+ switch (mp->b_datap->db_type) {
+ case M_DATA:
+ /*
+ * A data packet - do character-stuffing and FCS, and
+ * send it onwards.
+ */
+ ahdlc_encode(q, mp);
+ freemsg(mp);
+ break;
+
+ case M_IOCTL:
+ iop = (struct iocblk *) mp->b_rptr;
+ error = EINVAL;
+ switch (iop->ioc_cmd) {
+ case PPPIO_XACCM:
+ if ((iop->ioc_count < sizeof(u_int32_t)) ||
+ (iop->ioc_count > sizeof(ext_accm))) {
+ break;
+ }
+ if (mp->b_cont == 0) {
+ DPRINT1("ahdlc_wput/%d: PPPIO_XACCM b_cont = 0!\n", state->unit);
+ break;
+ }
+#if defined(USE_MUTEX)
+ mutex_enter(&state->lock);
+#endif /* USE_MUTEX */
+ bcopy((caddr_t)mp->b_cont->b_rptr, (caddr_t)state->xaccm,
+ iop->ioc_count);
+ state->xaccm[2] &= ~0x40000000; /* don't escape 0x5e */
+ state->xaccm[3] |= 0x60000000; /* do escape 0x7d, 0x7e */
+#if defined(USE_MUTEX)
+ mutex_exit(&state->lock);
+#endif /* USE_MUTEX */
+ iop->ioc_count = 0;
+ error = 0;
+ break;
+
+ case PPPIO_RACCM:
+ if (iop->ioc_count != sizeof(u_int32_t))
+ break;
+ if (mp->b_cont == 0) {
+ DPRINT1("ahdlc_wput/%d: PPPIO_RACCM b_cont = 0!\n", state->unit);
+ break;
+ }
+#if defined(USE_MUTEX)
+ mutex_enter(&state->lock);
+#endif /* USE_MUTEX */
+ bcopy((caddr_t)mp->b_cont->b_rptr, (caddr_t)&state->raccm,
+ sizeof(u_int32_t));
+#if defined(USE_MUTEX)
+ mutex_exit(&state->lock);
+#endif /* USE_MUTEX */
+ iop->ioc_count = 0;
+ error = 0;
+ break;
+
+ case PPPIO_GCLEAN:
+ np = allocb(sizeof(int), BPRI_HI);
+ if (np == 0) {
+ error = ENOSR;
+ break;
+ }
+ if (mp->b_cont != 0)
+ freemsg(mp->b_cont);
+ mp->b_cont = np;
+#if defined(USE_MUTEX)
+ mutex_enter(&state->lock);
+#endif /* USE_MUTEX */
+ *(int *)np->b_wptr = state->flags & RCV_FLAGS;
+#if defined(USE_MUTEX)
+ mutex_exit(&state->lock);
+#endif /* USE_MUTEX */
+ np->b_wptr += sizeof(int);
+ iop->ioc_count = sizeof(int);
+ error = 0;
+ break;
+
+ case PPPIO_GETSTAT:
+ np = allocb(sizeof(struct ppp_stats), BPRI_HI);
+ if (np == 0) {
+ error = ENOSR;
+ break;
+ }
+ if (mp->b_cont != 0)
+ freemsg(mp->b_cont);
+ mp->b_cont = np;
+ psp = (struct ppp_stats *) np->b_wptr;
+ np->b_wptr += sizeof(struct ppp_stats);
+ bzero((caddr_t)psp, sizeof(struct ppp_stats));
+ psp->p = state->stats;
+ iop->ioc_count = sizeof(struct ppp_stats);
+ error = 0;
+ break;
+
+ case PPPIO_LASTMOD:
+ /* we knew this anyway */
+ error = 0;
+ break;
+
+ default:
+ error = -1;
+ 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;
+ iop->ioc_error = error;
+ qreply(q, mp);
+ }
+ break;
+
+ case M_CTL:
+ switch (*mp->b_rptr) {
+ case PPPCTL_MTU:
+#if defined(USE_MUTEX)
+ mutex_enter(&state->lock);
+#endif /* USE_MUTEX */
+ state->mtu = ((unsigned short *)mp->b_rptr)[1];
+#if defined(USE_MUTEX)
+ mutex_exit(&state->lock);
+#endif /* USE_MUTEX */
+ freemsg(mp);
+ break;
+ case PPPCTL_MRU:
+#if defined(USE_MUTEX)
+ mutex_enter(&state->lock);
+#endif /* USE_MUTEX */
+ state->mru = ((unsigned short *)mp->b_rptr)[1];
+#if defined(USE_MUTEX)
+ mutex_exit(&state->lock);
+#endif /* USE_MUTEX */
+ freemsg(mp);
+ break;
+ case PPPCTL_UNIT:
+#if defined(USE_MUTEX)
+ mutex_enter(&state->lock);
+#endif /* USE_MUTEX */
+ state->unit = mp->b_rptr[1];
+#if defined(USE_MUTEX)
+ mutex_exit(&state->lock);
+#endif /* USE_MUTEX */
+ break;
+ default:
+ putnext(q, mp);
+ }
+ break;
+
+ default:
+ putnext(q, mp);
+ }
+
+ return 0;
+}
+
+/*
+ * Read side put routine
+ */
+static int
+ahdlc_rput(q, mp)
+ queue_t *q;
+ mblk_t *mp;
+{
+ ahdlc_state_t *state;
+
+ state = (ahdlc_state_t *) q->q_ptr;
+ if (state == 0) {
+ DPRINT("state == 0 in ahdlc_rput\n");
+ freemsg(mp);
+ return 0;
+ }
+
+ switch (mp->b_datap->db_type) {
+ case M_DATA:
+ ahdlc_decode(q, mp);
+ freemsg(mp);
+ break;
+
+ case M_HANGUP:
+#if defined(USE_MUTEX)
+ mutex_enter(&state->lock);
+#endif /* USE_MUTEX */
+ if (state->rx_buf != 0) {
+ /* XXX would like to send this up for debugging */
+ freemsg(state->rx_buf);
+ state->rx_buf = 0;
+ }
+ state->flags = IFLUSH;
+#if defined(USE_MUTEX)
+ mutex_exit(&state->lock);
+#endif /* USE_MUTEX */
+ putnext(q, mp);
+ break;
+
+ default:
+ putnext(q, mp);
+ }
+ return 0;
+}
+
+/*
+ * Extract bit c from map m, to determine if c needs to be escaped
+ */
+#define IN_TX_MAP(c, m) ((m)[(c) >> 5] & (1 << ((c) & 0x1f)))
+
+static void
+ahdlc_encode(q, mp)
+ queue_t *q;
+ mblk_t *mp;
+{
+ ahdlc_state_t *state;
+ u_int32_t *xaccm, loc_xaccm[8];
+ ushort_t fcs;
+ size_t outmp_len;
+ mblk_t *outmp, *tmp;
+ uchar_t *dp, fcs_val;
+ int is_lcp, code;
+#if defined(SOL2)
+ clock_t lbolt;
+#endif /* SOL2 */
+
+ if (msgdsize(mp) < 4) {
+ return;
+ }
+
+ state = (ahdlc_state_t *)q->q_ptr;
+#if defined(USE_MUTEX)
+ mutex_enter(&state->lock);
+#endif /* USE_MUTEX */
+
+ /*
+ * Allocate an output buffer large enough to handle a case where all
+ * characters need to be escaped
+ */
+ outmp_len = (msgdsize(mp) << 1) + /* input block x 2 */
+ (sizeof(fcs) << 2) + /* HDLC FCS x 4 */
+ (sizeof(uchar_t) << 1); /* HDLC flags x 2 */
+
+ outmp = allocb(outmp_len, BPRI_MED);
+ if (outmp == NULL) {
+ state->stats.ppp_oerrors++;
+#if defined(USE_MUTEX)
+ mutex_exit(&state->lock);
+#endif /* USE_MUTEX */
+ putctl1(RD(q)->q_next, M_CTL, PPPCTL_OERROR);
+ return;
+ }
+
+#if defined(SOL2)
+ /*
+ * Check if our last transmit happenned within flag_time, using
+ * the system's LBOLT value in clock ticks
+ */
+ if (drv_getparm(LBOLT, &lbolt) != -1) {
+ if (ABS((clock_t)lbolt - state->lbolt) > state->flag_time) {
+ *outmp->b_wptr++ = PPP_FLAG;
+ }
+ state->lbolt = lbolt;
+ } else {
+ *outmp->b_wptr++ = PPP_FLAG;
+ }
+#else
+ /*
+ * If the driver below still has a message to process, skip the
+ * HDLC flag, otherwise, put one in the beginning
+ */
+ if (qsize(q->q_next) == 0) {
+ *outmp->b_wptr++ = PPP_FLAG;
+ }
+#endif
+
+ /*
+ * All control characters must be escaped for LCP packets with code
+ * values between 1 (Conf-Req) and 7 (Code-Rej).
+ */
+ is_lcp = ((MSG_BYTE(mp, 0) == PPP_ALLSTATIONS) &&
+ (MSG_BYTE(mp, 1) == PPP_UI) &&
+ (MSG_BYTE(mp, 2) == (PPP_LCP >> 8)) &&
+ (MSG_BYTE(mp, 3) == (PPP_LCP & 0xff)) &&
+ LCP_USE_DFLT(mp));
+
+ xaccm = state->xaccm;
+ if (is_lcp) {
+ bcopy((caddr_t)state->xaccm, (caddr_t)loc_xaccm, sizeof(loc_xaccm));
+ loc_xaccm[0] = ~0; /* force escape on 0x00 through 0x1f */
+ xaccm = loc_xaccm;
+ }
+
+ fcs = PPP_INITFCS; /* Initial FCS is 0xffff */
+
+ /*
+ * Process this block and the rest (if any) attached to the this one
+ */
+ for (tmp = mp; tmp; tmp = tmp->b_cont) {
+ if (tmp->b_datap->db_type == M_DATA) {
+ for (dp = tmp->b_rptr; dp < tmp->b_wptr; dp++) {
+ fcs = PPP_FCS(fcs, *dp);
+ if (IN_TX_MAP(*dp, xaccm)) {
+ *outmp->b_wptr++ = PPP_ESCAPE;
+ *outmp->b_wptr++ = *dp ^ PPP_TRANS;
+ } else {
+ *outmp->b_wptr++ = *dp;
+ }
+ }
+ } else {
+ continue; /* skip if db_type is something other than M_DATA */
+ }
+ }
+
+ /*
+ * Append the HDLC FCS, making sure that escaping is done on any
+ * necessary bytes
+ */
+ fcs_val = (fcs ^ 0xffff) & 0xff;
+ if (IN_TX_MAP(fcs_val, xaccm)) {
+ *outmp->b_wptr++ = PPP_ESCAPE;
+ *outmp->b_wptr++ = fcs_val ^ PPP_TRANS;
+ } else {
+ *outmp->b_wptr++ = fcs_val;
+ }
+
+ fcs_val = ((fcs ^ 0xffff) >> 8) & 0xff;
+ if (IN_TX_MAP(fcs_val, xaccm)) {
+ *outmp->b_wptr++ = PPP_ESCAPE;
+ *outmp->b_wptr++ = fcs_val ^ PPP_TRANS;
+ } else {
+ *outmp->b_wptr++ = fcs_val;
+ }
+
+ /*
+ * And finally, append the HDLC flag, and send it away
+ */
+ *outmp->b_wptr++ = PPP_FLAG;
+
+ state->stats.ppp_obytes += msgdsize(outmp);
+ state->stats.ppp_opackets++;
+
+#if defined(USE_MUTEX)
+ mutex_exit(&state->lock);
+#endif /* USE_MUTEX */
+
+ putnext(q, outmp);
+ return;
+}
+
+/*
+ * Checks the 32-bit receive ACCM to see if the byte needs un-escaping
+ */
+#define IN_RX_MAP(c, m) ((((unsigned int) (uchar_t) (c)) < 0x20) && \
+ (m) & (1 << (c)))
+
+
+/*
+ * Process received characters.
+ */
+static void
+ahdlc_decode(q, mp)
+ queue_t *q;
+ mblk_t *mp;
+{
+ ahdlc_state_t *state;
+ mblk_t *om;
+ uchar_t *dp;
+ ushort_t fcs;
+#if defined(SOL2)
+ mblk_t *zmp;
+#endif /* SOL2 */
+
+#if defined(SOL2)
+ /*
+ * In case the driver (or something below) doesn't send
+ * data upstream in one message block, concatenate everything
+ */
+ if (!((mp->b_wptr - mp->b_rptr == msgdsize(mp)) &&
+ ((intpointer_t)mp->b_rptr % sizeof(intpointer_t) == 0))) {
+
+ zmp = msgpullup(mp, -1);
+ freemsg(mp);
+ mp = zmp;
+ if (mp == 0)
+ return;
+ }
+#endif /* SOL2 */
+
+ state = (ahdlc_state_t *) q->q_ptr;
+
+#if defined(USE_MUTEX)
+ mutex_enter(&state->lock);
+#endif /* USE_MUTEX */
+
+ state->stats.ppp_ibytes += msgdsize(mp);
+
+ for (dp = mp->b_rptr; dp < mp->b_wptr; dp++) {
+
+ /*
+ * This should detect the lack of 8-bit communication channel
+ * which is necessary for PPP to work. In addition, it also
+ * checks on the parity.
+ */
+ if (*dp & 0x80)
+ state->flags |= RCV_B7_1;
+ else
+ state->flags |= RCV_B7_0;
+
+ if (paritytab[*dp >> 5] & (1 << (*dp & 0x1f)))
+ state->flags |= RCV_ODDP;
+ else
+ state->flags |= RCV_EVNP;
+
+ /*
+ * So we have a HDLC flag ...
+ */
+ if (*dp == PPP_FLAG) {
+
+ /*
+ * If we think that it marks the beginning of the frame,
+ * then continue to process the next octects
+ */
+ if ((state->flags & IFLUSH) ||
+ (state->rx_buf == 0) ||
+ (msgdsize(state->rx_buf) == 0)) {
+
+ state->flags &= ~IFLUSH;
+ continue;
+ }
+
+ /*
+ * We get here because the above condition isn't true,
+ * in which case the HDLC flag was there to mark the end
+ * of the frame (or so we think)
+ */
+ om = state->rx_buf;
+
+ if (state->infcs == PPP_GOODFCS) {
+ state->stats.ppp_ipackets++;
+ adjmsg(om, -PPP_FCSLEN);
+ putnext(q, om);
+ } else {
+ DPRINT2("ppp%d: bad fcs (len=%d)\n",
+ state->unit, msgdsize(state->rx_buf));
+ freemsg(state->rx_buf);
+ state->flags &= ~(IFLUSH | ESCAPED);
+ state->stats.ppp_ierrors++;
+ putctl1(q->q_next, M_CTL, PPPCTL_IERROR);
+ }
+
+ state->rx_buf = 0;
+ continue;
+ }
+
+ if (state->flags & IFLUSH) {
+ continue;
+ }
+
+ /*
+ * Allocate a receive buffer, large enough to store a frame (after
+ * un-escaping) of at least 1500 octets. If MRU is negotiated to
+ * be more than the default, then allocate that much. In addition,
+ * we add an extra 32-bytes for a fudge factor
+ */
+ if (state->rx_buf == 0) {
+ state->rx_buf_size = (state->mru < PPP_MRU ? PPP_MRU : state->mru);
+ state->rx_buf_size += (sizeof(u_int32_t) << 3);
+ state->rx_buf = allocb(state->rx_buf_size, BPRI_MED);
+
+ /*
+ * If allocation fails, try again on the next frame
+ */
+ if (state->rx_buf == 0) {
+ state->flags |= IFLUSH;
+ continue;
+ }
+ state->flags &= ~(IFLUSH | ESCAPED);
+ state->infcs = PPP_INITFCS;
+ }
+
+ if (*dp == PPP_ESCAPE) {
+ state->flags |= ESCAPED;
+ continue;
+ }
+
+ /*
+ * Make sure we un-escape the necessary characters, as well as the
+ * ones in our receive async control character map
+ */
+ if (state->flags & ESCAPED) {
+ *dp ^= PPP_TRANS;
+ state->flags &= ~ESCAPED;
+ } else if (IN_RX_MAP(*dp, state->raccm))
+ continue;
+
+ /*
+ * Unless the peer lied to us about the negotiated MRU, we should
+ * never get a frame which is too long. If it happens, toss it away
+ * and grab the next incoming one
+ */
+ if (msgdsize(state->rx_buf) < state->rx_buf_size) {
+ state->infcs = PPP_FCS(state->infcs, *dp);
+ *state->rx_buf->b_wptr++ = *dp;
+ } else {
+ DPRINT2("ppp%d: frame too long (%d)\n",
+ state->unit, msgdsize(state->rx_buf));
+ freemsg(state->rx_buf);
+ state->rx_buf = 0;
+ state->flags |= IFLUSH;
+ }
+ }
+
+#if defined(USE_MUTEX)
+ mutex_exit(&state->lock);
+#endif /* USE_MUTEX */
+}
+
+static int
+msg_byte(mp, i)
+ mblk_t *mp;
+ unsigned int i;
+{
+ while (mp != 0 && i >= mp->b_wptr - mp->b_rptr)
+ mp = mp->b_cont;
+ if (mp == 0)
+ return -1;
+ return mp->b_rptr[i];
+}
projects / ppp.git / blobdiff