diff options
Diffstat (limited to 'mdk-stage1/ppp/modules/ppp_ahdlc.c')
| -rw-r--r-- | mdk-stage1/ppp/modules/ppp_ahdlc.c | 878 |
1 files changed, 0 insertions, 878 deletions
diff --git a/mdk-stage1/ppp/modules/ppp_ahdlc.c b/mdk-stage1/ppp/modules/ppp_ahdlc.c deleted file mode 100644 index d0b961258..000000000 --- a/mdk-stage1/ppp/modules/ppp_ahdlc.c +++ /dev/null @@ -1,878 +0,0 @@ -/* - * 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. - * - * $Id$ - */ - -/* - * 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]; -} |