1 | /* |
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2 | * ppp_tty.c - Point-to-Point Protocol (PPP) driver for asynchronous |
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3 | * tty devices. |
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4 | * |
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5 | * Copyright (c) 1989 Carnegie Mellon University. |
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6 | * All rights reserved. |
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7 | * |
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8 | * Redistribution and use in source and binary forms are permitted |
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9 | * provided that the above copyright notice and this paragraph are |
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10 | * duplicated in all such forms and that any documentation, |
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11 | * advertising materials, and other materials related to such |
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12 | * distribution and use acknowledge that the software was developed |
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13 | * by Carnegie Mellon University. The name of the |
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14 | * University may not be used to endorse or promote products derived |
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15 | * from this software without specific prior written permission. |
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16 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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17 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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18 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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19 | * |
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20 | * Drew D. Perkins |
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21 | * Carnegie Mellon University |
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22 | * 4910 Forbes Ave. |
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23 | * Pittsburgh, PA 15213 |
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24 | * (412) 268-8576 |
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25 | * ddp@andrew.cmu.edu |
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26 | * |
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27 | * Based on: |
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28 | * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89 |
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29 | * |
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30 | * Copyright (c) 1987 Regents of the University of California. |
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31 | * All rights reserved. |
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32 | * |
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33 | * Redistribution and use in source and binary forms are permitted |
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34 | * provided that the above copyright notice and this paragraph are |
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35 | * duplicated in all such forms and that any documentation, |
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36 | * advertising materials, and other materials related to such |
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37 | * distribution and use acknowledge that the software was developed |
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38 | * by the University of California, Berkeley. The name of the |
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39 | * University may not be used to endorse or promote products derived |
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40 | * from this software without specific prior written permission. |
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41 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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42 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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43 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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44 | * |
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45 | * Serial Line interface |
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46 | * |
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47 | * Rick Adams |
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48 | * Center for Seismic Studies |
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49 | * 1300 N 17th Street, Suite 1450 |
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50 | * Arlington, Virginia 22209 |
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51 | * (703)276-7900 |
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52 | * rick@seismo.ARPA |
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53 | * seismo!rick |
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54 | * |
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55 | * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). |
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56 | * Converted to 4.3BSD Beta by Chris Torek. |
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57 | * Other changes made at Berkeley, based in part on code by Kirk Smith. |
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58 | * |
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59 | * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com) |
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60 | * Added VJ tcp header compression; more unified ioctls |
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61 | * |
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62 | * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au). |
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63 | * Cleaned up a lot of the mbuf-related code to fix bugs that |
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64 | * caused system crashes and packet corruption. Changed pppstart |
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65 | * so that it doesn't just give up with a "collision" if the whole |
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66 | * packet doesn't fit in the output ring buffer. |
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67 | * |
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68 | * Added priority queueing for interactive IP packets, following |
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69 | * the model of if_sl.c, plus hooks for bpf. |
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70 | * Paul Mackerras (paulus@cs.anu.edu.au). |
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71 | */ |
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72 | |
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73 | /* $Id$ */ |
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74 | /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ |
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75 | /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ |
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76 | |
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77 | #include "ppp.h" |
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78 | #if NPPP > 0 |
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79 | |
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80 | #include <sys/param.h> |
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81 | #include <sys/systm.h> |
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82 | #include <sys/proc.h> |
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83 | #include <sys/mbuf.h> |
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84 | #include <sys/socket.h> |
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85 | #include <sys/ioctl.h> |
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86 | #include <sys/file.h> |
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87 | #include <sys/kernel.h> |
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88 | |
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89 | #include <net/if.h> |
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90 | #include <net/if_types.h> |
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91 | |
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92 | #ifdef VJC |
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93 | #include <netinet/in.h> |
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94 | #include <netinet/in_systm.h> |
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95 | #include <netinet/ip.h> |
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96 | #include <net/pppcompress.h> |
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97 | #endif |
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98 | |
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99 | #include <rtems.h> |
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100 | #include <rtems/libio.h> |
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101 | #include <sys/ttycom.h> |
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102 | #include <termios.h> |
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103 | #include <rtems/termiostypes.h> |
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104 | |
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105 | #ifdef PPP_FILTER |
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106 | #include <net/bpf.h> |
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107 | #endif |
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108 | #include <net/ppp_defs.h> |
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109 | #include <net/if_ppp.h> |
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110 | #include <net/if_pppvar.h> |
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111 | |
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112 | |
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113 | void pppasyncattach __P((void)); |
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114 | int pppopen __P((struct rtems_termios_tty *tty)); |
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115 | int pppclose __P((struct rtems_termios_tty *tty)); |
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116 | int pppread __P((struct rtems_termios_tty *tty, rtems_libio_rw_args_t *rw_args)); |
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117 | int pppwrite __P((struct rtems_termios_tty *tty, rtems_libio_rw_args_t *rw_args)); |
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118 | int ppptioctl __P((struct rtems_termios_tty *tty, rtems_libio_ioctl_args_t *args)); |
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119 | int pppinput __P((int c, struct rtems_termios_tty *tty)); |
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120 | int pppstart __P((struct rtems_termios_tty *tp)); |
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121 | u_short pppfcs __P((u_short fcs, u_char *cp, int len)); |
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122 | void pppallocmbuf __P((struct ppp_softc *sc, struct mbuf **mp)); |
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123 | |
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124 | static void pppasyncstart __P((struct ppp_softc *)); |
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125 | static void pppasyncctlp __P((struct ppp_softc *)); |
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126 | static void pppasyncrelinq __P((struct ppp_softc *)); |
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127 | /*static void ppp_timeout __P((void *)); */ |
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128 | /*static void pppdumpb __P((u_char *b, int l)); */ |
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129 | /*static void ppplogchar __P((struct ppp_softc *, int)); */ |
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130 | |
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131 | /* |
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132 | * Some useful mbuf macros not in mbuf.h. |
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133 | */ |
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134 | #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) |
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135 | |
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136 | #define M_DATASTART(m) \ |
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137 | (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ |
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138 | (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) |
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139 | |
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140 | #define M_DATASIZE(m) \ |
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141 | (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ |
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142 | (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) |
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143 | |
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144 | /* |
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145 | * We steal two bits in the mbuf m_flags, to mark high-priority packets |
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146 | * for output, and received packets following lost/corrupted packets. |
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147 | */ |
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148 | #define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ |
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149 | #define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ |
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150 | |
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151 | /* |
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152 | * Does c need to be escaped? |
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153 | */ |
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154 | #define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F))) |
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155 | |
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156 | /* |
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157 | * Procedures for using an async tty interface for PPP. |
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158 | */ |
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159 | |
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160 | /* This is a FreeBSD-2.0 kernel. */ |
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161 | #define CCOUNT(rb) (((rb).Size+(rb).Head-(rb).Tail) % (rb).Size) |
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162 | #define FCOUNT(rb) ((rb).Size-CCOUNT(rb)-1) |
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163 | #define PPP_LOWAT 100 /* Process more output when < LOWAT on queue */ |
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164 | #define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */ |
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165 | |
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166 | /* |
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167 | * Define the PPP line discipline. |
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168 | */ |
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169 | |
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170 | static struct linesw pppdisc = { |
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171 | pppopen, pppclose, pppread, pppwrite, |
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172 | pppinput, pppstart, ppptioctl, NULL |
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173 | }; |
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174 | |
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175 | void |
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176 | pppasyncattach() |
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177 | { |
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178 | linesw[PPPDISC] = pppdisc; |
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179 | } |
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180 | |
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181 | TEXT_SET(pseudo_set, pppasyncattach); |
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182 | |
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183 | /* |
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184 | * Line specific open routine for async tty devices. |
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185 | * Attach the given tty to the first available ppp unit. |
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186 | * Called from device open routine or ttioctl. |
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187 | */ |
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188 | /* ARGSUSED */ |
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189 | int |
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190 | pppopen(struct rtems_termios_tty *tty) |
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191 | { |
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192 | int i; |
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193 | register struct ppp_softc *sc; |
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194 | struct mbuf *m = (struct mbuf *)0; |
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195 | extern int termios_baud_to_number(int); |
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196 | |
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197 | if (tty->t_line == PPPDISC) { |
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198 | sc = (struct ppp_softc *)tty->t_sc; |
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199 | if (sc != NULL && sc->sc_devp == (void *)tty) { |
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200 | return (0); |
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201 | } |
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202 | } |
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203 | |
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204 | if ((sc = pppalloc(1)) == NULL) { |
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205 | return ENXIO; |
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206 | } |
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207 | |
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208 | if (sc->sc_relinq) |
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209 | (*sc->sc_relinq)(sc); /* get previous owner to relinquish the unit */ |
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210 | |
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211 | sc->sc_ilen = 0; |
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212 | sc->sc_m = NULL; |
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213 | bzero(sc->sc_asyncmap, sizeof(sc->sc_asyncmap)); |
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214 | sc->sc_asyncmap[0] = 0xffffffff; |
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215 | sc->sc_asyncmap[3] = 0x60000000; |
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216 | sc->sc_rasyncmap = 0; |
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217 | sc->sc_devp = tty; |
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218 | sc->sc_start = pppasyncstart; |
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219 | sc->sc_ctlp = pppasyncctlp; |
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220 | sc->sc_relinq = pppasyncrelinq; |
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221 | sc->sc_outm = NULL; |
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222 | sc->sc_outmc = NULL; |
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223 | |
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224 | /* preallocate mbufs for free queue */ |
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225 | rtems_bsdnet_semaphore_obtain(); |
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226 | for (i=0; i<NUM_MBUFQ; i++) { |
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227 | pppallocmbuf(sc, &m); |
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228 | if ( i == 0 ) { |
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229 | /* use first mbuf for rx iterrupt handling */ |
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230 | sc->sc_m = m; |
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231 | } |
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232 | else { |
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233 | /* enqueue mbuf for later use */ |
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234 | IF_ENQUEUE(&sc->sc_freeq, m); |
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235 | } |
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236 | m = (struct mbuf *)0; |
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237 | } |
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238 | rtems_bsdnet_semaphore_release(); |
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239 | |
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240 | /* initialize values */ |
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241 | sc->sc_if.if_flags |= IFF_RUNNING; |
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242 | sc->sc_if.if_baudrate = |
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243 | termios_baud_to_number(tty->termios.c_cflag & CBAUD); |
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244 | |
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245 | tty->t_sc = (void *)sc; |
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246 | |
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247 | return ( RTEMS_SUCCESSFUL ); |
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248 | } |
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249 | |
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250 | /* |
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251 | * Line specific close routine, called from device close routine |
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252 | * and from ttioctl. |
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253 | * Detach the tty from the ppp unit. |
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254 | * Mimics part of ttyclose(). |
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255 | */ |
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256 | int |
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257 | pppclose(struct rtems_termios_tty *tty) |
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258 | { |
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259 | register struct ppp_softc *sc; |
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260 | |
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261 | tty->t_line = 0; |
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262 | sc = (struct ppp_softc *)tty->t_sc; |
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263 | if (sc != NULL) { |
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264 | tty->t_sc = NULL; |
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265 | if (tty == (struct rtems_termios_tty *)sc->sc_devp) { |
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266 | rtems_bsdnet_semaphore_obtain(); |
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267 | pppasyncrelinq(sc); |
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268 | pppdealloc(sc); |
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269 | rtems_bsdnet_semaphore_release(); |
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270 | } |
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271 | } |
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272 | return ( RTEMS_SUCCESSFUL ); |
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273 | } |
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274 | |
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275 | /* |
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276 | * Relinquish the interface unit to another device. |
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277 | */ |
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278 | static void |
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279 | pppasyncrelinq(sc) |
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280 | struct ppp_softc *sc; |
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281 | { |
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282 | #ifdef XXX_XXX |
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283 | if (sc->sc_outm) { |
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284 | m_freem(sc->sc_outm); |
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285 | sc->sc_outm = NULL; |
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286 | } |
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287 | if (sc->sc_m) { |
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288 | m_freem(sc->sc_m); |
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289 | sc->sc_m = NULL; |
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290 | } |
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291 | if (sc->sc_flags & SC_TIMEOUT) { |
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292 | untimeout(ppp_timeout, (void *) sc); |
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293 | sc->sc_flags &= ~SC_TIMEOUT; |
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294 | } |
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295 | #endif |
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296 | } |
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297 | |
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298 | /* |
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299 | * Line specific (tty) read routine. |
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300 | */ |
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301 | int |
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302 | pppread(struct rtems_termios_tty *tty, rtems_libio_rw_args_t *rw_args) |
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303 | { |
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304 | rtems_status_code status = RTEMS_UNSATISFIED; |
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305 | int count = 0; |
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306 | int maximum = rw_args->count; |
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307 | char *buffer = rw_args->buffer; |
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308 | register struct ppp_softc *sc = (struct ppp_softc *)tty->t_sc; |
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309 | struct mbuf *m; |
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310 | struct mbuf *m0; |
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311 | u_char *p; |
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312 | |
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313 | if (sc == NULL) { |
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314 | return 0; |
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315 | } |
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316 | |
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317 | /* |
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318 | * Loop waiting for input, checking that nothing disasterous |
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319 | * happens in the meantime. |
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320 | */ |
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321 | if (tty != (struct rtems_termios_tty *)sc->sc_devp || tty->t_line != PPPDISC) { |
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322 | return ( status ); |
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323 | } |
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324 | if (sc->sc_inq.ifq_head == NULL) { |
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325 | return ( status ); |
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326 | } |
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327 | |
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328 | /* Get the packet from the input queue */ |
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329 | rtems_bsdnet_semaphore_obtain(); |
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330 | IF_DEQUEUE(&sc->sc_inq, m0); |
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331 | |
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332 | /* loop over mbuf chain */ |
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333 | m = m0; |
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334 | while (( m != NULL ) && ( m->m_len > 0 ) && ( count+m->m_len < maximum )) { |
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335 | /* copy data into buffer */ |
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336 | p = mtod(m, u_char *); |
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337 | memcpy(buffer, p, m->m_len); |
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338 | memset(p, 0, m->m_len); |
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339 | count += m->m_len; |
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340 | buffer += m->m_len; |
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341 | |
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342 | /* increment loop index */ |
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343 | m = m->m_next; |
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344 | } |
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345 | |
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346 | /* free mbuf chain */ |
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347 | m_freem(m0); |
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348 | rtems_bsdnet_semaphore_release(); |
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349 | |
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350 | /* update return values */ |
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351 | rw_args->bytes_moved = count; |
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352 | if ( count >= 0 ) { |
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353 | status = RTEMS_SUCCESSFUL; |
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354 | } |
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355 | |
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356 | /* check to see if queue is empty */ |
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357 | if (sc->sc_inq.ifq_head != NULL) { |
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358 | /* queue is not empty - post another event to ourself */ |
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359 | rtems_event_send(sc->sc_pppdtask, PPPD_EVENT); |
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360 | } |
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361 | |
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362 | return ( status ); |
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363 | } |
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364 | |
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365 | /* |
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366 | * Line specific (tty) write routine. |
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367 | */ |
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368 | int |
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369 | pppwrite(struct rtems_termios_tty *tty, rtems_libio_rw_args_t *rw_args) |
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370 | { |
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371 | struct sockaddr dst; |
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372 | int n; |
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373 | int len; |
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374 | int maximum = rw_args->count; |
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375 | char *out_buffer = rw_args->buffer; |
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376 | register struct ppp_softc *sc = (struct ppp_softc *)tty->t_sc; |
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377 | struct mbuf *m; |
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378 | struct mbuf *m0; |
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379 | struct mbuf **mp; |
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380 | |
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381 | rtems_bsdnet_semaphore_obtain(); |
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382 | for (mp = &m0; maximum; mp = &m->m_next) { |
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383 | MGET(m, M_WAIT, MT_DATA); |
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384 | if ((*mp = m) == NULL) { |
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385 | m_freem(m0); |
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386 | return (ENOBUFS); |
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387 | } |
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388 | m->m_len = 0; |
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389 | if (maximum >= MCLBYTES / 2) { |
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390 | MCLGET(m, M_DONTWAIT); |
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391 | } |
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392 | len = M_TRAILINGSPACE(m); |
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393 | if (len > maximum) { |
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394 | memcpy(mtod(m, u_char *),out_buffer,maximum); |
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395 | m->m_len = maximum; |
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396 | maximum = 0; |
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397 | } |
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398 | else { |
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399 | memcpy(mtod(m, u_char *),out_buffer,len); |
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400 | m->m_len = len; |
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401 | maximum -= len; |
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402 | out_buffer += len; |
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403 | } |
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404 | } |
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405 | |
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406 | dst.sa_family = AF_UNSPEC; |
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407 | bcopy(mtod(m0, u_char *), dst.sa_data, PPP_HDRLEN); |
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408 | m0->m_data += PPP_HDRLEN; |
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409 | m0->m_len -= PPP_HDRLEN; |
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410 | |
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411 | n = pppoutput(&sc->sc_if, m0, &dst, (struct rtentry *)0); |
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412 | rtems_bsdnet_semaphore_release(); |
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413 | |
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414 | return ( n ); |
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415 | } |
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416 | |
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417 | /* |
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418 | * Line specific (tty) ioctl routine. |
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419 | * This discipline requires that tty device drivers call |
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420 | * the line specific l_ioctl routine from their ioctl routines. |
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421 | */ |
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422 | /* ARGSUSED */ |
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423 | int |
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424 | ppptioctl(struct rtems_termios_tty *tty, rtems_libio_ioctl_args_t *args) |
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425 | { |
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426 | /* int i; */ |
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427 | int error = RTEMS_SUCCESSFUL; |
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428 | int cmd = args->command; |
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429 | caddr_t data = args->buffer; |
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430 | struct ppp_softc *sc = tty->t_sc; |
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431 | |
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432 | switch (cmd) { |
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433 | case RTEMS_IO_GET_ATTRIBUTES: |
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434 | case RTEMS_IO_SET_ATTRIBUTES: |
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435 | case RTEMS_IO_TCDRAIN: |
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436 | case RTEMS_IO_SNDWAKEUP: |
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437 | case RTEMS_IO_RCVWAKEUP: |
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438 | case TIOCGETD: |
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439 | case TIOCSETD: |
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440 | error = rtems_termios_ioctl(args); |
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441 | break; |
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442 | |
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443 | case PPPIOCSASYNCMAP: |
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444 | sc->sc_asyncmap[0] = *(u_int *)data; |
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445 | break; |
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446 | |
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447 | case PPPIOCGASYNCMAP: |
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448 | *(u_int *)data = sc->sc_asyncmap[0]; |
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449 | break; |
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450 | |
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451 | case PPPIOCSRASYNCMAP: |
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452 | sc->sc_rasyncmap = *(u_int *)data; |
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453 | break; |
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454 | |
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455 | case PPPIOCGRASYNCMAP: |
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456 | *(u_int *)data = sc->sc_rasyncmap; |
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457 | break; |
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458 | |
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459 | case PPPIOCSXASYNCMAP: |
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460 | bcopy(data, sc->sc_asyncmap, sizeof(sc->sc_asyncmap)); |
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461 | sc->sc_asyncmap[1] = 0; /* mustn't escape 0x20 - 0x3f */ |
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462 | sc->sc_asyncmap[2] &= ~0x40000000; /* mustn't escape 0x5e */ |
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463 | sc->sc_asyncmap[3] |= 0x60000000; /* must escape 0x7d, 0x7e */ |
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464 | break; |
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465 | |
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466 | case PPPIOCGXASYNCMAP: |
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467 | bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap)); |
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468 | break; |
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469 | |
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470 | default: |
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471 | rtems_bsdnet_semaphore_obtain(); |
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472 | error = pppioctl(sc, cmd, data, 0, NULL); |
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473 | rtems_bsdnet_semaphore_release(); |
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474 | } |
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475 | return error; |
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476 | } |
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477 | |
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478 | /* |
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479 | * FCS lookup table as calculated by genfcstab. |
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480 | */ |
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481 | static u_short fcstab[256] = { |
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482 | 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, |
---|
483 | 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, |
---|
484 | 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, |
---|
485 | 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, |
---|
486 | 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, |
---|
487 | 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, |
---|
488 | 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, |
---|
489 | 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, |
---|
490 | 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, |
---|
491 | 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, |
---|
492 | 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, |
---|
493 | 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, |
---|
494 | 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, |
---|
495 | 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, |
---|
496 | 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, |
---|
497 | 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, |
---|
498 | 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, |
---|
499 | 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, |
---|
500 | 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, |
---|
501 | 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, |
---|
502 | 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, |
---|
503 | 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, |
---|
504 | 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, |
---|
505 | 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, |
---|
506 | 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, |
---|
507 | 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, |
---|
508 | 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, |
---|
509 | 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, |
---|
510 | 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, |
---|
511 | 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, |
---|
512 | 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, |
---|
513 | 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 |
---|
514 | }; |
---|
515 | |
---|
516 | /* |
---|
517 | * Calculate a new FCS given the current FCS and the new data. |
---|
518 | */ |
---|
519 | u_short |
---|
520 | pppfcs(u_short fcs, u_char *cp, int len) |
---|
521 | { |
---|
522 | while (len--) |
---|
523 | fcs = PPP_FCS(fcs, *cp++); |
---|
524 | return (fcs); |
---|
525 | } |
---|
526 | |
---|
527 | /* |
---|
528 | * This gets called at splsoftnet from if_ppp.c at various times |
---|
529 | * when there is data ready to be sent. |
---|
530 | */ |
---|
531 | void pppasyncstart(struct ppp_softc *sc) |
---|
532 | { |
---|
533 | /* check to see if output is not active */ |
---|
534 | if ( sc->sc_outflag == 0 ) { |
---|
535 | /* mark active and post tx event to daemon */ |
---|
536 | sc->sc_outflag |= SC_TX_PENDING; |
---|
537 | rtems_event_send(sc->sc_txtask, TX_PACKET); |
---|
538 | } |
---|
539 | } |
---|
540 | |
---|
541 | /* |
---|
542 | * This gets called when a received packet is placed on |
---|
543 | * the inq, at splsoftnet. |
---|
544 | */ |
---|
545 | static void |
---|
546 | pppasyncctlp(sc) |
---|
547 | struct ppp_softc *sc; |
---|
548 | { |
---|
549 | /* check to see if task id was set */ |
---|
550 | if ( sc->sc_pppdtask != 0 ) { |
---|
551 | /* post event to daemon */ |
---|
552 | rtems_event_send(sc->sc_pppdtask, PPPD_EVENT); |
---|
553 | } |
---|
554 | } |
---|
555 | |
---|
556 | /* |
---|
557 | * Start output on async tty interface. If the transmit queue |
---|
558 | * has drained sufficiently, arrange for pppasyncstart to be |
---|
559 | * called later at splsoftnet. |
---|
560 | * Called at spltty or higher. |
---|
561 | */ |
---|
562 | int |
---|
563 | pppstart(struct rtems_termios_tty *tp) |
---|
564 | { |
---|
565 | char *sendBegin; |
---|
566 | u_long ioffset = (u_long )0; |
---|
567 | struct mbuf *m = (struct mbuf *)0; |
---|
568 | struct ppp_softc *sc = tp->t_sc; |
---|
569 | |
---|
570 | /* ensure input is valid and we are busy */ |
---|
571 | if (( sc != NULL ) && ( sc->sc_outflag & SC_TX_BUSY )) { |
---|
572 | /* check to see if we need to get the next buffer */ |
---|
573 | if ( sc->sc_outoff >= sc->sc_outlen ) { |
---|
574 | /* loop to get next non-zero length buffer */ |
---|
575 | if ( sc->sc_outmc != NULL ) { |
---|
576 | m = sc->sc_outmc->m_next; |
---|
577 | } |
---|
578 | |
---|
579 | /* check for next mbuf in chain */ |
---|
580 | if ( m != NULL ) { |
---|
581 | /* update values to use this mbuf */ |
---|
582 | sc->sc_outmc = m; |
---|
583 | sc->sc_outbuf = mtod(m, u_char *); |
---|
584 | sc->sc_outlen = m->m_len; |
---|
585 | sc->sc_outoff = (short)0; |
---|
586 | } |
---|
587 | else if ( (sc->sc_outflag & SC_TX_FCS) == 0 ) { |
---|
588 | /* setup to use FCS buffer */ |
---|
589 | sc->sc_outflag |= SC_TX_FCS; |
---|
590 | sc->sc_outbuf = sc->sc_outfcsbuf; |
---|
591 | sc->sc_outlen = sc->sc_outfcslen; |
---|
592 | sc->sc_outoff = (short)0; |
---|
593 | } |
---|
594 | else { |
---|
595 | /* done with this packet */ |
---|
596 | sc->sc_outflag &= ~SC_TX_BUSY; |
---|
597 | sc->sc_outchar = (u_char)PPP_FLAG; |
---|
598 | (*tp->device.write)(tp->minor, &sc->sc_outchar, 1); |
---|
599 | rtems_event_send(sc->sc_txtask, TX_TRANSMIT); |
---|
600 | } |
---|
601 | } |
---|
602 | |
---|
603 | /* check to see if there is some data to write out */ |
---|
604 | if ( sc->sc_outoff < sc->sc_outlen ) { |
---|
605 | /* check to see if character needs to be escaped */ |
---|
606 | sc->sc_outchar = sc->sc_outbuf[sc->sc_outoff]; |
---|
607 | if ( ESCAPE_P(sc->sc_outchar) ) { |
---|
608 | if ( sc->sc_outflag & SC_TX_ESCAPE ) { |
---|
609 | /* last sent character was the escape character */ |
---|
610 | sc->sc_outchar = sc->sc_outchar ^ PPP_TRANS; |
---|
611 | |
---|
612 | /* clear the escape flag and increment the offset */ |
---|
613 | sc->sc_outflag &= ~SC_TX_ESCAPE; |
---|
614 | ioffset++; |
---|
615 | } |
---|
616 | else { |
---|
617 | /* need to send the escape character */ |
---|
618 | sc->sc_outchar = PPP_ESCAPE; |
---|
619 | |
---|
620 | /* set the escape flag */ |
---|
621 | sc->sc_outflag |= SC_TX_ESCAPE; |
---|
622 | } |
---|
623 | sendBegin = &sc->sc_outchar; |
---|
624 | } |
---|
625 | else { |
---|
626 | /* escape not needed - increment the offset as much as possible */ |
---|
627 | while ((!ESCAPE_P(sc->sc_outchar)) && ((sc->sc_outoff + ioffset) < sc->sc_outlen)) { |
---|
628 | ioffset++; |
---|
629 | sc->sc_outchar = sc->sc_outbuf[sc->sc_outoff + ioffset]; |
---|
630 | } |
---|
631 | sendBegin = &sc->sc_outbuf[sc->sc_outoff]; |
---|
632 | } |
---|
633 | |
---|
634 | /* write out the character(s) and update the stats */ |
---|
635 | (*tp->device.write)(tp->minor, sendBegin, (ioffset > 0) ? ioffset : 1); |
---|
636 | sc->sc_stats.ppp_obytes += (ioffset > 0) ? ioffset : 1; |
---|
637 | sc->sc_outoff += ioffset; |
---|
638 | } |
---|
639 | } |
---|
640 | |
---|
641 | return ( 0 ); |
---|
642 | } |
---|
643 | |
---|
644 | #ifdef XXX_XXX |
---|
645 | /* |
---|
646 | * Timeout routine - try to start some more output. |
---|
647 | */ |
---|
648 | static void |
---|
649 | ppp_timeout(x) |
---|
650 | void *x; |
---|
651 | { |
---|
652 | struct rtems_termios_tty *tty = (struct rtems_termios_tty *)x; |
---|
653 | struct ppp_softc *sc = tty->t_sc; |
---|
654 | /* struct rtems_termios_tty *tp = (struct rtems_termios_tty *)sc->sc_devp; */ |
---|
655 | |
---|
656 | sc->sc_flags &= ~SC_TIMEOUT; |
---|
657 | /* pppstart(tp); */ |
---|
658 | } |
---|
659 | #endif |
---|
660 | |
---|
661 | /* |
---|
662 | * Allocate enough mbuf to handle current MRU. |
---|
663 | */ |
---|
664 | #ifdef XXX_XXX |
---|
665 | static void |
---|
666 | pppgetm(sc) |
---|
667 | register struct ppp_softc *sc; |
---|
668 | { |
---|
669 | struct mbuf *m, **mp; |
---|
670 | int len; |
---|
671 | |
---|
672 | mp = &sc->sc_m; |
---|
673 | for (len = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; len > 0; ){ |
---|
674 | if ((m = *mp) == NULL) { |
---|
675 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
---|
676 | if (m == NULL) |
---|
677 | break; |
---|
678 | *mp = m; |
---|
679 | MCLGET(m, M_DONTWAIT); |
---|
680 | } |
---|
681 | len -= M_DATASIZE(m); |
---|
682 | mp = &m->m_next; |
---|
683 | } |
---|
684 | } |
---|
685 | #endif |
---|
686 | |
---|
687 | void |
---|
688 | pppallocmbuf(struct ppp_softc *sc, struct mbuf **mp) |
---|
689 | { |
---|
690 | int ilen; |
---|
691 | struct mbuf *m; |
---|
692 | |
---|
693 | /* loop over length value */ |
---|
694 | ilen = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; |
---|
695 | while ( ilen > 0 ) { |
---|
696 | /* see if this is end of the chain */ |
---|
697 | m = *mp; |
---|
698 | if ( m == NULL ) { |
---|
699 | /* get mbuf header */ |
---|
700 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
---|
701 | if ( m == NULL ) { |
---|
702 | /* error - set condition to break out */ |
---|
703 | printf("pppallocmbuf: MGETHDR failed\n"); |
---|
704 | break; |
---|
705 | } |
---|
706 | MCLGET(m, M_DONTWAIT); |
---|
707 | m->m_next = NULL; |
---|
708 | *mp = m; |
---|
709 | } |
---|
710 | |
---|
711 | /* update loop variables */ |
---|
712 | mp = &m->m_next; |
---|
713 | ilen -= M_DATASIZE(m); |
---|
714 | } |
---|
715 | } |
---|
716 | |
---|
717 | /* |
---|
718 | * tty interface receiver interrupt. |
---|
719 | */ |
---|
720 | static unsigned paritytab[8] = { |
---|
721 | 0x96696996, 0x69969669, 0x69969669, 0x96696996, |
---|
722 | 0x69969669, 0x96696996, 0x96696996, 0x69969669 |
---|
723 | }; |
---|
724 | |
---|
725 | int |
---|
726 | pppinput(int c, struct rtems_termios_tty *tp) |
---|
727 | { |
---|
728 | register struct ppp_softc *sc = tp->t_sc; |
---|
729 | struct mbuf *m; |
---|
730 | int ilen; |
---|
731 | |
---|
732 | if (sc == NULL || tp != (struct rtems_termios_tty *)sc->sc_devp) |
---|
733 | return 0; |
---|
734 | if (sc->sc_m == NULL) { |
---|
735 | rtems_event_send(sc->sc_rxtask, RX_EMPTY); |
---|
736 | IF_DEQUEUE(&sc->sc_freeq, sc->sc_m); |
---|
737 | if ( sc->sc_m == NULL ) { |
---|
738 | return 0; |
---|
739 | } |
---|
740 | } |
---|
741 | |
---|
742 | ++sc->sc_stats.ppp_ibytes; |
---|
743 | |
---|
744 | c &= 0xff; |
---|
745 | if (c & 0x80) |
---|
746 | sc->sc_flags |= SC_RCV_B7_1; |
---|
747 | else |
---|
748 | sc->sc_flags |= SC_RCV_B7_0; |
---|
749 | if (paritytab[c >> 5] & (1 << (c & 0x1F))) |
---|
750 | sc->sc_flags |= SC_RCV_ODDP; |
---|
751 | else |
---|
752 | sc->sc_flags |= SC_RCV_EVNP; |
---|
753 | |
---|
754 | if (c == PPP_FLAG) { |
---|
755 | ilen = sc->sc_ilen; |
---|
756 | sc->sc_ilen = 0; |
---|
757 | |
---|
758 | /* |
---|
759 | * If SC_ESCAPED is set, then we've seen the packet |
---|
760 | * abort sequence "}~". |
---|
761 | */ |
---|
762 | if (sc->sc_flags & (SC_FLUSH | SC_ESCAPED) |
---|
763 | || (ilen > 0 && sc->sc_fcs != PPP_GOODFCS)) { |
---|
764 | sc->sc_flags |= SC_PKTLOST; /* note the dropped packet */ |
---|
765 | if ((sc->sc_flags & (SC_FLUSH | SC_ESCAPED)) == 0){ |
---|
766 | /* bad fcs error */ |
---|
767 | sc->sc_if.if_ierrors++; |
---|
768 | sc->sc_stats.ppp_ierrors++; |
---|
769 | } else |
---|
770 | sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED); |
---|
771 | return 0; |
---|
772 | } |
---|
773 | |
---|
774 | if (ilen < PPP_HDRLEN + PPP_FCSLEN) { |
---|
775 | if (ilen) { |
---|
776 | /* too short error */ |
---|
777 | sc->sc_if.if_ierrors++; |
---|
778 | sc->sc_stats.ppp_ierrors++; |
---|
779 | sc->sc_flags |= SC_PKTLOST; |
---|
780 | } |
---|
781 | return 0; |
---|
782 | } |
---|
783 | |
---|
784 | /* Remove FCS trailer. Somewhat painful... */ |
---|
785 | ilen -= 2; |
---|
786 | if (--sc->sc_mc->m_len == 0) { |
---|
787 | for (m = sc->sc_m; m->m_next != sc->sc_mc; m = m->m_next); |
---|
788 | sc->sc_mc = m; |
---|
789 | } |
---|
790 | sc->sc_mc->m_len--; |
---|
791 | |
---|
792 | /* excise this mbuf chain - place on raw queue */ |
---|
793 | m = sc->sc_m; |
---|
794 | if ( sc->sc_flags & SC_PKTLOST ) { |
---|
795 | m->m_flags |= M_ERRMARK; |
---|
796 | sc->sc_flags &= ~SC_PKTLOST; |
---|
797 | } |
---|
798 | IF_ENQUEUE(&sc->sc_rawq, m); |
---|
799 | |
---|
800 | /* setup next mbuf chain */ |
---|
801 | IF_DEQUEUE(&sc->sc_freeq, sc->sc_m); |
---|
802 | |
---|
803 | /* send rx packet event */ |
---|
804 | rtems_event_send(sc->sc_rxtask, RX_PACKET); |
---|
805 | return 0; |
---|
806 | } |
---|
807 | |
---|
808 | if (c < 0x20 && (sc->sc_rasyncmap & (1 << c))) |
---|
809 | return 0; |
---|
810 | |
---|
811 | if (sc->sc_flags & SC_ESCAPED) { |
---|
812 | sc->sc_flags &= ~SC_ESCAPED; |
---|
813 | c ^= PPP_TRANS; |
---|
814 | } else if (c == PPP_ESCAPE) { |
---|
815 | sc->sc_flags |= SC_ESCAPED; |
---|
816 | return 0; |
---|
817 | } |
---|
818 | |
---|
819 | /* |
---|
820 | * Initialize buffer on first octet received. |
---|
821 | * First octet could be address or protocol (when compressing |
---|
822 | * address/control). |
---|
823 | * Second octet is control. |
---|
824 | * Third octet is first or second (when compressing protocol) |
---|
825 | * octet of protocol. |
---|
826 | * Fourth octet is second octet of protocol. |
---|
827 | */ |
---|
828 | if (sc->sc_ilen == 0) { |
---|
829 | m = sc->sc_m; |
---|
830 | m->m_len = 0; |
---|
831 | m->m_data = M_DATASTART(sc->sc_m); |
---|
832 | sc->sc_mc = m; |
---|
833 | sc->sc_mp = mtod(m, char *); |
---|
834 | sc->sc_fcs = PPP_INITFCS; |
---|
835 | if (c != PPP_ALLSTATIONS) { |
---|
836 | if (sc->sc_flags & SC_REJ_COMP_AC) { |
---|
837 | /* garbage received error */ |
---|
838 | goto flush; |
---|
839 | } |
---|
840 | *sc->sc_mp++ = PPP_ALLSTATIONS; |
---|
841 | *sc->sc_mp++ = PPP_UI; |
---|
842 | sc->sc_ilen += 2; |
---|
843 | m->m_len += 2; |
---|
844 | } |
---|
845 | } |
---|
846 | if (sc->sc_ilen == 1 && c != PPP_UI) { |
---|
847 | /* missing UI error */ |
---|
848 | goto flush; |
---|
849 | } |
---|
850 | if (sc->sc_ilen == 2 && (c & 1) == 1) { |
---|
851 | /* a compressed protocol */ |
---|
852 | *sc->sc_mp++ = 0; |
---|
853 | sc->sc_ilen++; |
---|
854 | sc->sc_mc->m_len++; |
---|
855 | } |
---|
856 | if (sc->sc_ilen == 3 && (c & 1) == 0) { |
---|
857 | /* bad protocol error */ |
---|
858 | goto flush; |
---|
859 | } |
---|
860 | |
---|
861 | /* packet beyond configured mru? */ |
---|
862 | if (++sc->sc_ilen > sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN) { |
---|
863 | /* packet too big error */ |
---|
864 | goto flush; |
---|
865 | } |
---|
866 | |
---|
867 | /* is this mbuf full? */ |
---|
868 | m = sc->sc_mc; |
---|
869 | if (M_TRAILINGSPACE(m) <= 0) { |
---|
870 | if (m->m_next == NULL) { |
---|
871 | /* get next available mbuf for the chain */ |
---|
872 | IF_DEQUEUE(&sc->sc_freeq, m->m_next); |
---|
873 | if (m->m_next == NULL) { |
---|
874 | /* too few mbufs */ |
---|
875 | goto flush; |
---|
876 | } |
---|
877 | else { |
---|
878 | /* send rx mbuf event */ |
---|
879 | rtems_event_send(sc->sc_rxtask, RX_MBUF); |
---|
880 | } |
---|
881 | } |
---|
882 | sc->sc_mc = m = m->m_next; |
---|
883 | m->m_len = 0; |
---|
884 | m->m_next = 0; |
---|
885 | m->m_data = M_DATASTART(m); |
---|
886 | sc->sc_mp = mtod(m, char *); |
---|
887 | } |
---|
888 | |
---|
889 | ++m->m_len; |
---|
890 | *sc->sc_mp++ = c; |
---|
891 | sc->sc_fcs = PPP_FCS(sc->sc_fcs, c); |
---|
892 | return 0; |
---|
893 | |
---|
894 | flush: |
---|
895 | if (!(sc->sc_flags & SC_FLUSH)) { |
---|
896 | sc->sc_if.if_ierrors++; |
---|
897 | sc->sc_stats.ppp_ierrors++; |
---|
898 | sc->sc_flags |= SC_FLUSH; |
---|
899 | } |
---|
900 | return 0; |
---|
901 | } |
---|
902 | |
---|
903 | #ifdef XXX_XXX |
---|
904 | #define MAX_DUMP_BYTES 128 |
---|
905 | |
---|
906 | static void |
---|
907 | ppplogchar(sc, c) |
---|
908 | struct ppp_softc *sc; |
---|
909 | int c; |
---|
910 | { |
---|
911 | if (c >= 0) |
---|
912 | sc->sc_rawin[sc->sc_rawin_count++] = c; |
---|
913 | if (sc->sc_rawin_count >= sizeof(sc->sc_rawin) |
---|
914 | || (c < 0 && sc->sc_rawin_count > 0)) { |
---|
915 | printf("ppp%d input: ", sc->sc_if.if_unit); |
---|
916 | pppdumpb(sc->sc_rawin, sc->sc_rawin_count); |
---|
917 | sc->sc_rawin_count = 0; |
---|
918 | } |
---|
919 | } |
---|
920 | |
---|
921 | static void |
---|
922 | pppdumpb(b, l) |
---|
923 | u_char *b; |
---|
924 | int l; |
---|
925 | { |
---|
926 | char buf[3*MAX_DUMP_BYTES+4]; |
---|
927 | char *bp = buf; |
---|
928 | static char digits[] = "0123456789abcdef"; |
---|
929 | |
---|
930 | while (l--) { |
---|
931 | if (bp >= buf + sizeof(buf) - 3) { |
---|
932 | *bp++ = '>'; |
---|
933 | break; |
---|
934 | } |
---|
935 | *bp++ = digits[*b >> 4]; /* convert byte to ascii hex */ |
---|
936 | *bp++ = digits[*b++ & 0xf]; |
---|
937 | *bp++ = ' '; |
---|
938 | } |
---|
939 | |
---|
940 | *bp = 0; |
---|
941 | printf("%s\n", buf); |
---|
942 | } |
---|
943 | #endif |
---|
944 | |
---|
945 | #endif /* NPPP > 0 */ |
---|