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1 | office | 1 | /** |
2 | * @file |
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3 | * Network Point to Point Protocol over Serial file. |
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4 | * |
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5 | */ |
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6 | |||
7 | /* |
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8 | * Redistribution and use in source and binary forms, with or without modification, |
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9 | * are permitted provided that the following conditions are met: |
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10 | * |
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11 | * 1. Redistributions of source code must retain the above copyright notice, |
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12 | * this list of conditions and the following disclaimer. |
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13 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
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14 | * this list of conditions and the following disclaimer in the documentation |
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15 | * and/or other materials provided with the distribution. |
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16 | * 3. The name of the author may not be used to endorse or promote products |
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17 | * derived from this software without specific prior written permission. |
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18 | * |
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19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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20 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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21 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
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22 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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23 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
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24 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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27 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
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28 | * OF SUCH DAMAGE. |
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29 | * |
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30 | * This file is part of the lwIP TCP/IP stack. |
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31 | * |
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32 | */ |
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33 | |||
34 | #include "netif/ppp/ppp_opts.h" |
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35 | #if PPP_SUPPORT && PPPOS_SUPPORT /* don't build if not configured for use in lwipopts.h */ |
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36 | |||
37 | #include <string.h> |
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38 | |||
39 | #include "lwip/arch.h" |
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40 | #include "lwip/err.h" |
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41 | #include "lwip/pbuf.h" |
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42 | #include "lwip/sys.h" |
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43 | #include "lwip/memp.h" |
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44 | #include "lwip/netif.h" |
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45 | #include "lwip/snmp.h" |
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46 | #include "lwip/priv/tcpip_priv.h" |
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47 | #include "lwip/api.h" |
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48 | #include "lwip/ip4.h" /* for ip4_input() */ |
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49 | |||
50 | #include "netif/ppp/ppp_impl.h" |
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51 | #include "netif/ppp/pppos.h" |
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52 | #include "netif/ppp/vj.h" |
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53 | |||
54 | /* Memory pool */ |
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55 | LWIP_MEMPOOL_DECLARE(PPPOS_PCB, MEMP_NUM_PPPOS_INTERFACES, sizeof(pppos_pcb), "PPPOS_PCB") |
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56 | |||
57 | /* callbacks called from PPP core */ |
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58 | static err_t pppos_write(ppp_pcb *ppp, void *ctx, struct pbuf *p); |
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59 | static err_t pppos_netif_output(ppp_pcb *ppp, void *ctx, struct pbuf *pb, u16_t protocol); |
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60 | static void pppos_connect(ppp_pcb *ppp, void *ctx); |
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61 | #if PPP_SERVER |
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62 | static void pppos_listen(ppp_pcb *ppp, void *ctx); |
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63 | #endif /* PPP_SERVER */ |
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64 | static void pppos_disconnect(ppp_pcb *ppp, void *ctx); |
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65 | static err_t pppos_destroy(ppp_pcb *ppp, void *ctx); |
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66 | static void pppos_send_config(ppp_pcb *ppp, void *ctx, u32_t accm, int pcomp, int accomp); |
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67 | static void pppos_recv_config(ppp_pcb *ppp, void *ctx, u32_t accm, int pcomp, int accomp); |
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68 | |||
69 | /* Prototypes for procedures local to this file. */ |
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70 | #if PPP_INPROC_IRQ_SAFE |
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71 | static void pppos_input_callback(void *arg); |
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72 | #endif /* PPP_INPROC_IRQ_SAFE */ |
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73 | static void pppos_input_free_current_packet(pppos_pcb *pppos); |
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74 | static void pppos_input_drop(pppos_pcb *pppos); |
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75 | static err_t pppos_output_append(pppos_pcb *pppos, err_t err, struct pbuf *nb, u8_t c, u8_t accm, u16_t *fcs); |
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76 | static err_t pppos_output_last(pppos_pcb *pppos, err_t err, struct pbuf *nb, u16_t *fcs); |
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77 | |||
78 | /* Callbacks structure for PPP core */ |
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79 | static const struct link_callbacks pppos_callbacks = { |
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80 | pppos_connect, |
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81 | #if PPP_SERVER |
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82 | pppos_listen, |
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83 | #endif /* PPP_SERVER */ |
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84 | pppos_disconnect, |
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85 | pppos_destroy, |
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86 | pppos_write, |
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87 | pppos_netif_output, |
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88 | pppos_send_config, |
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89 | pppos_recv_config |
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90 | }; |
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91 | |||
92 | /* PPP's Asynchronous-Control-Character-Map. The mask array is used |
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93 | * to select the specific bit for a character. */ |
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94 | #define ESCAPE_P(accm, c) ((accm)[(c) >> 3] & 1 << (c & 0x07)) |
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95 | |||
96 | #if PPP_FCS_TABLE |
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97 | /* |
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98 | * FCS lookup table as calculated by genfcstab. |
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99 | */ |
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100 | static const u16_t fcstab[256] = { |
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101 | 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, |
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102 | 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, |
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103 | 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, |
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104 | 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, |
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105 | 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, |
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106 | 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, |
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107 | 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, |
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108 | 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, |
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109 | 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, |
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110 | 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, |
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111 | 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, |
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112 | 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, |
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113 | 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, |
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114 | 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, |
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115 | 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, |
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116 | 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, |
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117 | 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, |
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118 | 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, |
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119 | 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, |
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120 | 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, |
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121 | 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, |
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122 | 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, |
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123 | 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, |
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124 | 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, |
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125 | 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, |
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126 | 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, |
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127 | 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, |
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128 | 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, |
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129 | 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, |
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130 | 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, |
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131 | 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, |
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132 | 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 |
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133 | }; |
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134 | #define PPP_FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff]) |
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135 | #else /* PPP_FCS_TABLE */ |
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136 | /* The HDLC polynomial: X**0 + X**5 + X**12 + X**16 (0x8408) */ |
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137 | #define PPP_FCS_POLYNOMIAL 0x8408 |
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138 | static u16_t |
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139 | ppp_get_fcs(u8_t byte) |
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140 | { |
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141 | unsigned int octet; |
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142 | int bit; |
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143 | octet = byte; |
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144 | for (bit = 8; bit-- > 0; ) { |
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145 | octet = (octet & 0x01) ? ((octet >> 1) ^ PPP_FCS_POLYNOMIAL) : (octet >> 1); |
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146 | } |
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147 | return octet & 0xffff; |
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148 | } |
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149 | #define PPP_FCS(fcs, c) (((fcs) >> 8) ^ ppp_get_fcs(((fcs) ^ (c)) & 0xff)) |
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150 | #endif /* PPP_FCS_TABLE */ |
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151 | |||
152 | /* |
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153 | * Values for FCS calculations. |
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154 | */ |
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155 | #define PPP_INITFCS 0xffff /* Initial FCS value */ |
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156 | #define PPP_GOODFCS 0xf0b8 /* Good final FCS value */ |
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157 | |||
158 | #if PPP_INPROC_IRQ_SAFE |
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159 | #define PPPOS_DECL_PROTECT(lev) SYS_ARCH_DECL_PROTECT(lev) |
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160 | #define PPPOS_PROTECT(lev) SYS_ARCH_PROTECT(lev) |
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161 | #define PPPOS_UNPROTECT(lev) SYS_ARCH_UNPROTECT(lev) |
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162 | #else |
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163 | #define PPPOS_DECL_PROTECT(lev) |
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164 | #define PPPOS_PROTECT(lev) |
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165 | #define PPPOS_UNPROTECT(lev) |
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166 | #endif /* PPP_INPROC_IRQ_SAFE */ |
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167 | |||
168 | |||
169 | /* |
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170 | * Create a new PPP connection using the given serial I/O device. |
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171 | * |
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172 | * Return 0 on success, an error code on failure. |
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173 | */ |
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174 | ppp_pcb *pppos_create(struct netif *pppif, pppos_output_cb_fn output_cb, |
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175 | ppp_link_status_cb_fn link_status_cb, void *ctx_cb) |
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176 | { |
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177 | pppos_pcb *pppos; |
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178 | ppp_pcb *ppp; |
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179 | |||
180 | pppos = (pppos_pcb *)LWIP_MEMPOOL_ALLOC(PPPOS_PCB); |
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181 | if (pppos == NULL) { |
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182 | return NULL; |
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183 | } |
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184 | |||
185 | ppp = ppp_new(pppif, &pppos_callbacks, pppos, link_status_cb, ctx_cb); |
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186 | if (ppp == NULL) { |
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187 | LWIP_MEMPOOL_FREE(PPPOS_PCB, pppos); |
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188 | return NULL; |
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189 | } |
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190 | |||
191 | memset(pppos, 0, sizeof(pppos_pcb)); |
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192 | pppos->ppp = ppp; |
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193 | pppos->output_cb = output_cb; |
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194 | return ppp; |
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195 | } |
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196 | |||
197 | /* Called by PPP core */ |
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198 | static err_t |
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199 | pppos_write(ppp_pcb *ppp, void *ctx, struct pbuf *p) |
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200 | { |
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201 | pppos_pcb *pppos = (pppos_pcb *)ctx; |
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202 | u8_t *s; |
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203 | struct pbuf *nb; |
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204 | u16_t n; |
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205 | u16_t fcs_out; |
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206 | err_t err; |
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207 | LWIP_UNUSED_ARG(ppp); |
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208 | |||
209 | /* Grab an output buffer. */ |
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210 | nb = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL); |
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211 | if (nb == NULL) { |
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212 | PPPDEBUG(LOG_WARNING, ("pppos_write[%d]: alloc fail\n", ppp->netif->num)); |
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213 | LINK_STATS_INC(link.memerr); |
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214 | LINK_STATS_INC(link.drop); |
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215 | MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards); |
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216 | pbuf_free(p); |
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217 | return ERR_MEM; |
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218 | } |
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219 | |||
220 | /* Set nb->tot_len to actual payload length */ |
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221 | nb->tot_len = p->len; |
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222 | |||
223 | /* If the link has been idle, we'll send a fresh flag character to |
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224 | * flush any noise. */ |
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225 | err = ERR_OK; |
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226 | if ((sys_now() - pppos->last_xmit) >= PPP_MAXIDLEFLAG) { |
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227 | err = pppos_output_append(pppos, err, nb, PPP_FLAG, 0, NULL); |
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228 | } |
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229 | |||
230 | /* Load output buffer. */ |
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231 | fcs_out = PPP_INITFCS; |
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232 | s = (u8_t*)p->payload; |
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233 | n = p->len; |
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234 | while (n-- > 0) { |
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235 | err = pppos_output_append(pppos, err, nb, *s++, 1, &fcs_out); |
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236 | } |
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237 | |||
238 | err = pppos_output_last(pppos, err, nb, &fcs_out); |
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239 | if (err == ERR_OK) { |
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240 | PPPDEBUG(LOG_INFO, ("pppos_write[%d]: len=%d\n", ppp->netif->num, p->len)); |
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241 | } else { |
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242 | PPPDEBUG(LOG_WARNING, ("pppos_write[%d]: output failed len=%d\n", ppp->netif->num, p->len)); |
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243 | } |
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244 | pbuf_free(p); |
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245 | return err; |
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246 | } |
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247 | |||
248 | /* Called by PPP core */ |
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249 | static err_t |
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250 | pppos_netif_output(ppp_pcb *ppp, void *ctx, struct pbuf *pb, u16_t protocol) |
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251 | { |
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252 | pppos_pcb *pppos = (pppos_pcb *)ctx; |
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253 | struct pbuf *nb, *p; |
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254 | u16_t fcs_out; |
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255 | err_t err; |
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256 | LWIP_UNUSED_ARG(ppp); |
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257 | |||
258 | /* Grab an output buffer. */ |
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259 | nb = pbuf_alloc(PBUF_RAW, 0, PBUF_POOL); |
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260 | if (nb == NULL) { |
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261 | PPPDEBUG(LOG_WARNING, ("pppos_netif_output[%d]: alloc fail\n", ppp->netif->num)); |
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262 | LINK_STATS_INC(link.memerr); |
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263 | LINK_STATS_INC(link.drop); |
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264 | MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards); |
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265 | return ERR_MEM; |
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266 | } |
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267 | |||
268 | /* Set nb->tot_len to actual payload length */ |
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269 | nb->tot_len = pb->tot_len; |
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270 | |||
271 | /* If the link has been idle, we'll send a fresh flag character to |
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272 | * flush any noise. */ |
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273 | err = ERR_OK; |
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274 | if ((sys_now() - pppos->last_xmit) >= PPP_MAXIDLEFLAG) { |
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275 | err = pppos_output_append(pppos, err, nb, PPP_FLAG, 0, NULL); |
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276 | } |
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277 | |||
278 | fcs_out = PPP_INITFCS; |
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279 | if (!pppos->accomp) { |
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280 | err = pppos_output_append(pppos, err, nb, PPP_ALLSTATIONS, 1, &fcs_out); |
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281 | err = pppos_output_append(pppos, err, nb, PPP_UI, 1, &fcs_out); |
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282 | } |
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283 | if (!pppos->pcomp || protocol > 0xFF) { |
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284 | err = pppos_output_append(pppos, err, nb, (protocol >> 8) & 0xFF, 1, &fcs_out); |
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285 | } |
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286 | err = pppos_output_append(pppos, err, nb, protocol & 0xFF, 1, &fcs_out); |
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287 | |||
288 | /* Load packet. */ |
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289 | for(p = pb; p; p = p->next) { |
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290 | u16_t n = p->len; |
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291 | u8_t *s = (u8_t*)p->payload; |
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292 | |||
293 | while (n-- > 0) { |
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294 | err = pppos_output_append(pppos, err, nb, *s++, 1, &fcs_out); |
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295 | } |
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296 | } |
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297 | |||
298 | err = pppos_output_last(pppos, err, nb, &fcs_out); |
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299 | if (err == ERR_OK) { |
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300 | PPPDEBUG(LOG_INFO, ("pppos_netif_output[%d]: proto=0x%"X16_F", len = %d\n", ppp->netif->num, protocol, pb->tot_len)); |
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301 | } else { |
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302 | PPPDEBUG(LOG_WARNING, ("pppos_netif_output[%d]: output failed proto=0x%"X16_F", len = %d\n", ppp->netif->num, protocol, pb->tot_len)); |
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303 | } |
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304 | return err; |
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305 | } |
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306 | |||
307 | static void |
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308 | pppos_connect(ppp_pcb *ppp, void *ctx) |
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309 | { |
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310 | pppos_pcb *pppos = (pppos_pcb *)ctx; |
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311 | PPPOS_DECL_PROTECT(lev); |
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312 | |||
313 | #if PPP_INPROC_IRQ_SAFE |
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314 | /* input pbuf left over from last session? */ |
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315 | pppos_input_free_current_packet(pppos); |
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316 | #endif /* PPP_INPROC_IRQ_SAFE */ |
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317 | |||
318 | /* reset PPPoS control block to its initial state */ |
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319 | memset(&pppos->last_xmit, 0, sizeof(pppos_pcb) - offsetof(pppos_pcb, last_xmit)); |
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320 | |||
321 | /* |
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322 | * Default the in and out accm so that escape and flag characters |
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323 | * are always escaped. |
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324 | */ |
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325 | pppos->in_accm[15] = 0x60; /* no need to protect since RX is not running */ |
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326 | pppos->out_accm[15] = 0x60; |
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327 | PPPOS_PROTECT(lev); |
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328 | pppos->open = 1; |
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329 | PPPOS_UNPROTECT(lev); |
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330 | |||
331 | /* |
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332 | * Start the connection and handle incoming events (packet or timeout). |
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333 | */ |
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334 | PPPDEBUG(LOG_INFO, ("pppos_connect: unit %d: connecting\n", ppp->netif->num)); |
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335 | ppp_start(ppp); /* notify upper layers */ |
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336 | } |
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337 | |||
338 | #if PPP_SERVER |
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339 | static void |
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340 | pppos_listen(ppp_pcb *ppp, void *ctx) |
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341 | { |
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342 | pppos_pcb *pppos = (pppos_pcb *)ctx; |
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343 | PPPOS_DECL_PROTECT(lev); |
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344 | |||
345 | #if PPP_INPROC_IRQ_SAFE |
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346 | /* input pbuf left over from last session? */ |
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347 | pppos_input_free_current_packet(pppos); |
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348 | #endif /* PPP_INPROC_IRQ_SAFE */ |
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349 | |||
350 | /* reset PPPoS control block to its initial state */ |
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351 | memset(&pppos->last_xmit, 0, sizeof(pppos_pcb) - offsetof(pppos_pcb, last_xmit)); |
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352 | |||
353 | /* |
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354 | * Default the in and out accm so that escape and flag characters |
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355 | * are always escaped. |
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356 | */ |
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357 | pppos->in_accm[15] = 0x60; /* no need to protect since RX is not running */ |
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358 | pppos->out_accm[15] = 0x60; |
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359 | PPPOS_PROTECT(lev); |
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360 | pppos->open = 1; |
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361 | PPPOS_UNPROTECT(lev); |
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362 | |||
363 | /* |
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364 | * Wait for something to happen. |
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365 | */ |
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366 | PPPDEBUG(LOG_INFO, ("pppos_listen: unit %d: listening\n", ppp->netif->num)); |
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367 | ppp_start(ppp); /* notify upper layers */ |
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368 | } |
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369 | #endif /* PPP_SERVER */ |
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370 | |||
371 | static void |
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372 | pppos_disconnect(ppp_pcb *ppp, void *ctx) |
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373 | { |
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374 | pppos_pcb *pppos = (pppos_pcb *)ctx; |
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375 | PPPOS_DECL_PROTECT(lev); |
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376 | |||
377 | PPPOS_PROTECT(lev); |
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378 | pppos->open = 0; |
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379 | PPPOS_UNPROTECT(lev); |
||
380 | |||
381 | /* If PPP_INPROC_IRQ_SAFE is used we cannot call |
||
382 | * pppos_input_free_current_packet() here because |
||
383 | * rx IRQ might still call pppos_input(). |
||
384 | */ |
||
385 | #if !PPP_INPROC_IRQ_SAFE |
||
386 | /* input pbuf left ? */ |
||
387 | pppos_input_free_current_packet(pppos); |
||
388 | #endif /* !PPP_INPROC_IRQ_SAFE */ |
||
389 | |||
390 | ppp_link_end(ppp); /* notify upper layers */ |
||
391 | } |
||
392 | |||
393 | static err_t |
||
394 | pppos_destroy(ppp_pcb *ppp, void *ctx) |
||
395 | { |
||
396 | pppos_pcb *pppos = (pppos_pcb *)ctx; |
||
397 | LWIP_UNUSED_ARG(ppp); |
||
398 | |||
399 | #if PPP_INPROC_IRQ_SAFE |
||
400 | /* input pbuf left ? */ |
||
401 | pppos_input_free_current_packet(pppos); |
||
402 | #endif /* PPP_INPROC_IRQ_SAFE */ |
||
403 | |||
404 | LWIP_MEMPOOL_FREE(PPPOS_PCB, pppos); |
||
405 | return ERR_OK; |
||
406 | } |
||
407 | |||
408 | #if !NO_SYS && !PPP_INPROC_IRQ_SAFE |
||
409 | /** Pass received raw characters to PPPoS to be decoded through lwIP TCPIP thread. |
||
410 | * |
||
411 | * @param ppp PPP descriptor index, returned by pppos_create() |
||
412 | * @param s received data |
||
413 | * @param l length of received data |
||
414 | */ |
||
415 | err_t |
||
416 | pppos_input_tcpip(ppp_pcb *ppp, u8_t *s, int l) |
||
417 | { |
||
418 | struct pbuf *p; |
||
419 | err_t err; |
||
420 | |||
421 | p = pbuf_alloc(PBUF_RAW, l, PBUF_POOL); |
||
422 | if (!p) { |
||
423 | return ERR_MEM; |
||
424 | } |
||
425 | pbuf_take(p, s, l); |
||
426 | |||
427 | err = tcpip_inpkt(p, ppp_netif(ppp), pppos_input_sys); |
||
428 | if (err != ERR_OK) { |
||
429 | pbuf_free(p); |
||
430 | } |
||
431 | return err; |
||
432 | } |
||
433 | |||
434 | /* called from TCPIP thread */ |
||
435 | err_t pppos_input_sys(struct pbuf *p, struct netif *inp) { |
||
436 | ppp_pcb *ppp = (ppp_pcb*)inp->state; |
||
437 | struct pbuf *n; |
||
438 | |||
439 | for (n = p; n; n = n->next) { |
||
440 | pppos_input(ppp, (u8_t*)n->payload, n->len); |
||
441 | } |
||
442 | pbuf_free(p); |
||
443 | return ERR_OK; |
||
444 | } |
||
445 | #endif /* !NO_SYS && !PPP_INPROC_IRQ_SAFE */ |
||
446 | |||
447 | /** PPPoS input helper struct, must be packed since it is stored |
||
448 | * to pbuf->payload, which might be unaligned. */ |
||
449 | #if PPP_INPROC_IRQ_SAFE |
||
450 | #ifdef PACK_STRUCT_USE_INCLUDES |
||
451 | # include "arch/bpstruct.h" |
||
452 | #endif |
||
453 | PACK_STRUCT_BEGIN |
||
454 | struct pppos_input_header { |
||
455 | PACK_STRUCT_FIELD(ppp_pcb *ppp); |
||
456 | } PACK_STRUCT_STRUCT; |
||
457 | PACK_STRUCT_END |
||
458 | #ifdef PACK_STRUCT_USE_INCLUDES |
||
459 | # include "arch/epstruct.h" |
||
460 | #endif |
||
461 | #endif /* PPP_INPROC_IRQ_SAFE */ |
||
462 | |||
463 | /** Pass received raw characters to PPPoS to be decoded. |
||
464 | * |
||
465 | * @param ppp PPP descriptor index, returned by pppos_create() |
||
466 | * @param s received data |
||
467 | * @param l length of received data |
||
468 | */ |
||
469 | void |
||
470 | pppos_input(ppp_pcb *ppp, u8_t *s, int l) |
||
471 | { |
||
472 | pppos_pcb *pppos = (pppos_pcb *)ppp->link_ctx_cb; |
||
473 | struct pbuf *next_pbuf; |
||
474 | u8_t cur_char; |
||
475 | u8_t escaped; |
||
476 | PPPOS_DECL_PROTECT(lev); |
||
477 | |||
478 | PPPDEBUG(LOG_DEBUG, ("pppos_input[%d]: got %d bytes\n", ppp->netif->num, l)); |
||
479 | while (l-- > 0) { |
||
480 | cur_char = *s++; |
||
481 | |||
482 | PPPOS_PROTECT(lev); |
||
483 | /* ppp_input can disconnect the interface, we need to abort to prevent a memory |
||
484 | * leak if there are remaining bytes because pppos_connect and pppos_listen |
||
485 | * functions expect input buffer to be free. Furthermore there are no real |
||
486 | * reason to continue reading bytes if we are disconnected. |
||
487 | */ |
||
488 | if (!pppos->open) { |
||
489 | PPPOS_UNPROTECT(lev); |
||
490 | return; |
||
491 | } |
||
492 | escaped = ESCAPE_P(pppos->in_accm, cur_char); |
||
493 | PPPOS_UNPROTECT(lev); |
||
494 | /* Handle special characters. */ |
||
495 | if (escaped) { |
||
496 | /* Check for escape sequences. */ |
||
497 | /* XXX Note that this does not handle an escaped 0x5d character which |
||
498 | * would appear as an escape character. Since this is an ASCII ']' |
||
499 | * and there is no reason that I know of to escape it, I won't complicate |
||
500 | * the code to handle this case. GLL */ |
||
501 | if (cur_char == PPP_ESCAPE) { |
||
502 | pppos->in_escaped = 1; |
||
503 | /* Check for the flag character. */ |
||
504 | } else if (cur_char == PPP_FLAG) { |
||
505 | /* If this is just an extra flag character, ignore it. */ |
||
506 | if (pppos->in_state <= PDADDRESS) { |
||
507 | /* ignore it */; |
||
508 | /* If we haven't received the packet header, drop what has come in. */ |
||
509 | } else if (pppos->in_state < PDDATA) { |
||
510 | PPPDEBUG(LOG_WARNING, |
||
511 | ("pppos_input[%d]: Dropping incomplete packet %d\n", |
||
512 | ppp->netif->num, pppos->in_state)); |
||
513 | LINK_STATS_INC(link.lenerr); |
||
514 | pppos_input_drop(pppos); |
||
515 | /* If the fcs is invalid, drop the packet. */ |
||
516 | } else if (pppos->in_fcs != PPP_GOODFCS) { |
||
517 | PPPDEBUG(LOG_INFO, |
||
518 | ("pppos_input[%d]: Dropping bad fcs 0x%"X16_F" proto=0x%"X16_F"\n", |
||
519 | ppp->netif->num, pppos->in_fcs, pppos->in_protocol)); |
||
520 | /* Note: If you get lots of these, check for UART frame errors or try different baud rate */ |
||
521 | LINK_STATS_INC(link.chkerr); |
||
522 | pppos_input_drop(pppos); |
||
523 | /* Otherwise it's a good packet so pass it on. */ |
||
524 | } else { |
||
525 | struct pbuf *inp; |
||
526 | /* Trim off the checksum. */ |
||
527 | if(pppos->in_tail->len > 2) { |
||
528 | pppos->in_tail->len -= 2; |
||
529 | |||
530 | pppos->in_tail->tot_len = pppos->in_tail->len; |
||
531 | if (pppos->in_tail != pppos->in_head) { |
||
532 | pbuf_cat(pppos->in_head, pppos->in_tail); |
||
533 | } |
||
534 | } else { |
||
535 | pppos->in_tail->tot_len = pppos->in_tail->len; |
||
536 | if (pppos->in_tail != pppos->in_head) { |
||
537 | pbuf_cat(pppos->in_head, pppos->in_tail); |
||
538 | } |
||
539 | |||
540 | pbuf_realloc(pppos->in_head, pppos->in_head->tot_len - 2); |
||
541 | } |
||
542 | |||
543 | /* Dispatch the packet thereby consuming it. */ |
||
544 | inp = pppos->in_head; |
||
545 | /* Packet consumed, release our references. */ |
||
546 | pppos->in_head = NULL; |
||
547 | pppos->in_tail = NULL; |
||
548 | #if IP_FORWARD || LWIP_IPV6_FORWARD |
||
549 | /* hide the room for Ethernet forwarding header */ |
||
550 | pbuf_remove_header(inp, PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN); |
||
551 | #endif /* IP_FORWARD || LWIP_IPV6_FORWARD */ |
||
552 | #if PPP_INPROC_IRQ_SAFE |
||
553 | if(tcpip_try_callback(pppos_input_callback, inp) != ERR_OK) { |
||
554 | PPPDEBUG(LOG_ERR, ("pppos_input[%d]: tcpip_callback() failed, dropping packet\n", ppp->netif->num)); |
||
555 | pbuf_free(inp); |
||
556 | LINK_STATS_INC(link.drop); |
||
557 | MIB2_STATS_NETIF_INC(ppp->netif, ifindiscards); |
||
558 | } |
||
559 | #else /* PPP_INPROC_IRQ_SAFE */ |
||
560 | ppp_input(ppp, inp); |
||
561 | #endif /* PPP_INPROC_IRQ_SAFE */ |
||
562 | } |
||
563 | |||
564 | /* Prepare for a new packet. */ |
||
565 | pppos->in_fcs = PPP_INITFCS; |
||
566 | pppos->in_state = PDADDRESS; |
||
567 | pppos->in_escaped = 0; |
||
568 | /* Other characters are usually control characters that may have |
||
569 | * been inserted by the physical layer so here we just drop them. */ |
||
570 | } else { |
||
571 | PPPDEBUG(LOG_WARNING, |
||
572 | ("pppos_input[%d]: Dropping ACCM char <%d>\n", ppp->netif->num, cur_char)); |
||
573 | } |
||
574 | /* Process other characters. */ |
||
575 | } else { |
||
576 | /* Unencode escaped characters. */ |
||
577 | if (pppos->in_escaped) { |
||
578 | pppos->in_escaped = 0; |
||
579 | cur_char ^= PPP_TRANS; |
||
580 | } |
||
581 | |||
582 | /* Process character relative to current state. */ |
||
583 | switch(pppos->in_state) { |
||
584 | case PDIDLE: /* Idle state - waiting. */ |
||
585 | /* Drop the character if it's not 0xff |
||
586 | * we would have processed a flag character above. */ |
||
587 | if (cur_char != PPP_ALLSTATIONS) { |
||
588 | break; |
||
589 | } |
||
590 | /* no break */ |
||
591 | /* Fall through */ |
||
592 | |||
593 | case PDSTART: /* Process start flag. */ |
||
594 | /* Prepare for a new packet. */ |
||
595 | pppos->in_fcs = PPP_INITFCS; |
||
596 | /* no break */ |
||
597 | /* Fall through */ |
||
598 | |||
599 | case PDADDRESS: /* Process address field. */ |
||
600 | if (cur_char == PPP_ALLSTATIONS) { |
||
601 | pppos->in_state = PDCONTROL; |
||
602 | break; |
||
603 | } |
||
604 | /* no break */ |
||
605 | |||
606 | /* Else assume compressed address and control fields so |
||
607 | * fall through to get the protocol... */ |
||
608 | case PDCONTROL: /* Process control field. */ |
||
609 | /* If we don't get a valid control code, restart. */ |
||
610 | if (cur_char == PPP_UI) { |
||
611 | pppos->in_state = PDPROTOCOL1; |
||
612 | break; |
||
613 | } |
||
614 | /* no break */ |
||
615 | |||
616 | #if 0 |
||
617 | else { |
||
618 | PPPDEBUG(LOG_WARNING, |
||
619 | ("pppos_input[%d]: Invalid control <%d>\n", ppp->netif->num, cur_char)); |
||
620 | pppos->in_state = PDSTART; |
||
621 | } |
||
622 | #endif |
||
623 | case PDPROTOCOL1: /* Process protocol field 1. */ |
||
624 | /* If the lower bit is set, this is the end of the protocol |
||
625 | * field. */ |
||
626 | if (cur_char & 1) { |
||
627 | pppos->in_protocol = cur_char; |
||
628 | pppos->in_state = PDDATA; |
||
629 | } else { |
||
630 | pppos->in_protocol = (u16_t)cur_char << 8; |
||
631 | pppos->in_state = PDPROTOCOL2; |
||
632 | } |
||
633 | break; |
||
634 | case PDPROTOCOL2: /* Process protocol field 2. */ |
||
635 | pppos->in_protocol |= cur_char; |
||
636 | pppos->in_state = PDDATA; |
||
637 | break; |
||
638 | case PDDATA: /* Process data byte. */ |
||
639 | /* Make space to receive processed data. */ |
||
640 | if (pppos->in_tail == NULL || pppos->in_tail->len == PBUF_POOL_BUFSIZE) { |
||
641 | u16_t pbuf_alloc_len; |
||
642 | if (pppos->in_tail != NULL) { |
||
643 | pppos->in_tail->tot_len = pppos->in_tail->len; |
||
644 | if (pppos->in_tail != pppos->in_head) { |
||
645 | pbuf_cat(pppos->in_head, pppos->in_tail); |
||
646 | /* give up the in_tail reference now */ |
||
647 | pppos->in_tail = NULL; |
||
648 | } |
||
649 | } |
||
650 | /* If we haven't started a packet, we need a packet header. */ |
||
651 | pbuf_alloc_len = 0; |
||
652 | #if IP_FORWARD || LWIP_IPV6_FORWARD |
||
653 | /* If IP forwarding is enabled we are reserving PBUF_LINK_ENCAPSULATION_HLEN |
||
654 | * + PBUF_LINK_HLEN bytes so the packet is being allocated with enough header |
||
655 | * space to be forwarded (to Ethernet for example). |
||
656 | */ |
||
657 | if (pppos->in_head == NULL) { |
||
658 | pbuf_alloc_len = PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN; |
||
659 | } |
||
660 | #endif /* IP_FORWARD || LWIP_IPV6_FORWARD */ |
||
661 | next_pbuf = pbuf_alloc(PBUF_RAW, pbuf_alloc_len, PBUF_POOL); |
||
662 | if (next_pbuf == NULL) { |
||
663 | /* No free buffers. Drop the input packet and let the |
||
664 | * higher layers deal with it. Continue processing |
||
665 | * the received pbuf chain in case a new packet starts. */ |
||
666 | PPPDEBUG(LOG_ERR, ("pppos_input[%d]: NO FREE PBUFS!\n", ppp->netif->num)); |
||
667 | LINK_STATS_INC(link.memerr); |
||
668 | pppos_input_drop(pppos); |
||
669 | pppos->in_state = PDSTART; /* Wait for flag sequence. */ |
||
670 | break; |
||
671 | } |
||
672 | if (pppos->in_head == NULL) { |
||
673 | u8_t *payload = ((u8_t*)next_pbuf->payload) + pbuf_alloc_len; |
||
674 | #if PPP_INPROC_IRQ_SAFE |
||
675 | ((struct pppos_input_header*)payload)->ppp = ppp; |
||
676 | payload += sizeof(struct pppos_input_header); |
||
677 | next_pbuf->len += sizeof(struct pppos_input_header); |
||
678 | #endif /* PPP_INPROC_IRQ_SAFE */ |
||
679 | next_pbuf->len += sizeof(pppos->in_protocol); |
||
680 | *(payload++) = pppos->in_protocol >> 8; |
||
681 | *(payload) = pppos->in_protocol & 0xFF; |
||
682 | pppos->in_head = next_pbuf; |
||
683 | } |
||
684 | pppos->in_tail = next_pbuf; |
||
685 | } |
||
686 | /* Load character into buffer. */ |
||
687 | ((u8_t*)pppos->in_tail->payload)[pppos->in_tail->len++] = cur_char; |
||
688 | break; |
||
689 | default: |
||
690 | break; |
||
691 | } |
||
692 | |||
693 | /* update the frame check sequence number. */ |
||
694 | pppos->in_fcs = PPP_FCS(pppos->in_fcs, cur_char); |
||
695 | } |
||
696 | } /* while (l-- > 0), all bytes processed */ |
||
697 | } |
||
698 | |||
699 | #if PPP_INPROC_IRQ_SAFE |
||
700 | /* PPPoS input callback using one input pointer |
||
701 | */ |
||
702 | static void pppos_input_callback(void *arg) { |
||
703 | struct pbuf *pb = (struct pbuf*)arg; |
||
704 | ppp_pcb *ppp; |
||
705 | |||
706 | ppp = ((struct pppos_input_header*)pb->payload)->ppp; |
||
707 | if(pbuf_remove_header(pb, sizeof(struct pppos_input_header))) { |
||
708 | LWIP_ASSERT("pbuf_remove_header failed\n", 0); |
||
709 | goto drop; |
||
710 | } |
||
711 | |||
712 | /* Dispatch the packet thereby consuming it. */ |
||
713 | ppp_input(ppp, pb); |
||
714 | return; |
||
715 | |||
716 | drop: |
||
717 | LINK_STATS_INC(link.drop); |
||
718 | MIB2_STATS_NETIF_INC(ppp->netif, ifindiscards); |
||
719 | pbuf_free(pb); |
||
720 | } |
||
721 | #endif /* PPP_INPROC_IRQ_SAFE */ |
||
722 | |||
723 | static void |
||
724 | pppos_send_config(ppp_pcb *ppp, void *ctx, u32_t accm, int pcomp, int accomp) |
||
725 | { |
||
726 | int i; |
||
727 | pppos_pcb *pppos = (pppos_pcb *)ctx; |
||
728 | LWIP_UNUSED_ARG(ppp); |
||
729 | |||
730 | pppos->pcomp = pcomp; |
||
731 | pppos->accomp = accomp; |
||
732 | |||
733 | /* Load the ACCM bits for the 32 control codes. */ |
||
734 | for (i = 0; i < 32/8; i++) { |
||
735 | pppos->out_accm[i] = (u8_t)((accm >> (8 * i)) & 0xFF); |
||
736 | } |
||
737 | |||
738 | PPPDEBUG(LOG_INFO, ("pppos_send_config[%d]: out_accm=%X %X %X %X\n", |
||
739 | pppos->ppp->netif->num, |
||
740 | pppos->out_accm[0], pppos->out_accm[1], pppos->out_accm[2], pppos->out_accm[3])); |
||
741 | } |
||
742 | |||
743 | static void |
||
744 | pppos_recv_config(ppp_pcb *ppp, void *ctx, u32_t accm, int pcomp, int accomp) |
||
745 | { |
||
746 | int i; |
||
747 | pppos_pcb *pppos = (pppos_pcb *)ctx; |
||
748 | PPPOS_DECL_PROTECT(lev); |
||
749 | LWIP_UNUSED_ARG(ppp); |
||
750 | LWIP_UNUSED_ARG(pcomp); |
||
751 | LWIP_UNUSED_ARG(accomp); |
||
752 | |||
753 | /* Load the ACCM bits for the 32 control codes. */ |
||
754 | PPPOS_PROTECT(lev); |
||
755 | for (i = 0; i < 32 / 8; i++) { |
||
756 | pppos->in_accm[i] = (u8_t)(accm >> (i * 8)); |
||
757 | } |
||
758 | PPPOS_UNPROTECT(lev); |
||
759 | |||
760 | PPPDEBUG(LOG_INFO, ("pppos_recv_config[%d]: in_accm=%X %X %X %X\n", |
||
761 | pppos->ppp->netif->num, |
||
762 | pppos->in_accm[0], pppos->in_accm[1], pppos->in_accm[2], pppos->in_accm[3])); |
||
763 | } |
||
764 | |||
765 | /* |
||
766 | * Drop the input packet. |
||
767 | */ |
||
768 | static void |
||
769 | pppos_input_free_current_packet(pppos_pcb *pppos) |
||
770 | { |
||
771 | if (pppos->in_head != NULL) { |
||
772 | if (pppos->in_tail && (pppos->in_tail != pppos->in_head)) { |
||
773 | pbuf_free(pppos->in_tail); |
||
774 | } |
||
775 | pbuf_free(pppos->in_head); |
||
776 | pppos->in_head = NULL; |
||
777 | } |
||
778 | pppos->in_tail = NULL; |
||
779 | } |
||
780 | |||
781 | /* |
||
782 | * Drop the input packet and increase error counters. |
||
783 | */ |
||
784 | static void |
||
785 | pppos_input_drop(pppos_pcb *pppos) |
||
786 | { |
||
787 | if (pppos->in_head != NULL) { |
||
788 | #if 0 |
||
789 | PPPDEBUG(LOG_INFO, ("pppos_input_drop: %d:%.*H\n", pppos->in_head->len, min(60, pppos->in_head->len * 2), pppos->in_head->payload)); |
||
790 | #endif |
||
791 | PPPDEBUG(LOG_INFO, ("pppos_input_drop: pbuf len=%d, addr %p\n", pppos->in_head->len, (void*)pppos->in_head)); |
||
792 | } |
||
793 | pppos_input_free_current_packet(pppos); |
||
794 | #if VJ_SUPPORT |
||
795 | vj_uncompress_err(&pppos->ppp->vj_comp); |
||
796 | #endif /* VJ_SUPPORT */ |
||
797 | |||
798 | LINK_STATS_INC(link.drop); |
||
799 | MIB2_STATS_NETIF_INC(pppos->ppp->netif, ifindiscards); |
||
800 | } |
||
801 | |||
802 | /* |
||
803 | * pppos_output_append - append given character to end of given pbuf. |
||
804 | * If out_accm is not 0 and the character needs to be escaped, do so. |
||
805 | * If pbuf is full, send the pbuf and reuse it. |
||
806 | * Return the current pbuf. |
||
807 | */ |
||
808 | static err_t |
||
809 | pppos_output_append(pppos_pcb *pppos, err_t err, struct pbuf *nb, u8_t c, u8_t accm, u16_t *fcs) |
||
810 | { |
||
811 | if (err != ERR_OK) { |
||
812 | return err; |
||
813 | } |
||
814 | |||
815 | /* Make sure there is room for the character and an escape code. |
||
816 | * Sure we don't quite fill the buffer if the character doesn't |
||
817 | * get escaped but is one character worth complicating this? */ |
||
818 | if ((PBUF_POOL_BUFSIZE - nb->len) < 2) { |
||
819 | u32_t l = pppos->output_cb(pppos->ppp, (u8_t*)nb->payload, nb->len, pppos->ppp->ctx_cb); |
||
820 | if (l != nb->len) { |
||
821 | return ERR_IF; |
||
822 | } |
||
823 | nb->len = 0; |
||
824 | } |
||
825 | |||
826 | /* Update FCS before checking for special characters. */ |
||
827 | if (fcs) { |
||
828 | *fcs = PPP_FCS(*fcs, c); |
||
829 | } |
||
830 | |||
831 | /* Copy to output buffer escaping special characters. */ |
||
832 | if (accm && ESCAPE_P(pppos->out_accm, c)) { |
||
833 | *((u8_t*)nb->payload + nb->len++) = PPP_ESCAPE; |
||
834 | *((u8_t*)nb->payload + nb->len++) = c ^ PPP_TRANS; |
||
835 | } else { |
||
836 | *((u8_t*)nb->payload + nb->len++) = c; |
||
837 | } |
||
838 | |||
839 | return ERR_OK; |
||
840 | } |
||
841 | |||
842 | static err_t |
||
843 | pppos_output_last(pppos_pcb *pppos, err_t err, struct pbuf *nb, u16_t *fcs) |
||
844 | { |
||
845 | ppp_pcb *ppp = pppos->ppp; |
||
846 | |||
847 | /* Add FCS and trailing flag. */ |
||
848 | err = pppos_output_append(pppos, err, nb, ~(*fcs) & 0xFF, 1, NULL); |
||
849 | err = pppos_output_append(pppos, err, nb, (~(*fcs) >> 8) & 0xFF, 1, NULL); |
||
850 | err = pppos_output_append(pppos, err, nb, PPP_FLAG, 0, NULL); |
||
851 | |||
852 | if (err != ERR_OK) { |
||
853 | goto failed; |
||
854 | } |
||
855 | |||
856 | /* Send remaining buffer if not empty */ |
||
857 | if (nb->len > 0) { |
||
858 | u32_t l = pppos->output_cb(ppp, (u8_t*)nb->payload, nb->len, ppp->ctx_cb); |
||
859 | if (l != nb->len) { |
||
860 | err = ERR_IF; |
||
861 | goto failed; |
||
862 | } |
||
863 | } |
||
864 | |||
865 | pppos->last_xmit = sys_now(); |
||
866 | MIB2_STATS_NETIF_ADD(ppp->netif, ifoutoctets, nb->tot_len); |
||
867 | MIB2_STATS_NETIF_INC(ppp->netif, ifoutucastpkts); |
||
868 | LINK_STATS_INC(link.xmit); |
||
869 | pbuf_free(nb); |
||
870 | return ERR_OK; |
||
871 | |||
872 | failed: |
||
873 | pppos->last_xmit = 0; /* prepend PPP_FLAG to next packet */ |
||
874 | LINK_STATS_INC(link.err); |
||
875 | LINK_STATS_INC(link.drop); |
||
876 | MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards); |
||
877 | pbuf_free(nb); |
||
878 | return err; |
||
879 | } |
||
880 | |||
881 | #endif /* PPP_SUPPORT && PPPOS_SUPPORT */ |