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annotate packages/redboot/current/src/net/udp.c @ 2863:7d8c61e6225c default tip

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* Added execute permissions to files missed in conversion from CVS
author alexs
date Thu, 26 Mar 2009 20:39:18 +0000
parents 74dbf4c3f2e1
children
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1 //==========================================================================
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2 //
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3 // net/udp.c
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4 //
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5 // Stand-alone UDP networking support for RedBoot
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6 //
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7 //==========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): gthomas
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43 // Contributors: gthomas
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44 // Date: 2000-07-14
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45 // Purpose:
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46 // Description:
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47 //
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48 // This code is part of RedBoot (tm).
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //==========================================================================
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53
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54 #include <redboot.h>
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55 #include <net/net.h>
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56
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57 #ifdef UDP_STATS
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58 static int udp_rx_total;
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59 static int udp_rx_handled;
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60 static int udp_rx_cksum;
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61 static int udp_rx_dropped;
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62 #endif
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63
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64 #define MAX_UDP_DATA (ETH_MAX_PKTLEN - (ETH_HDR_SIZE + \
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65 sizeof(ip_header_t) + \
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66 sizeof(udp_header_t)))
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67
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68 /*
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69 * A major assumption is that only a very small number of sockets will
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70 * active, so a simple linear search of those sockets is acceptible.
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71 */
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72 static udp_socket_t *udp_list;
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73
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74
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75 /*
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76 * Install a handler for incoming udp packets.
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77 * Caller provides the udp_socket_t structure.
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78 * Returns zero if successful, -1 if socket is already used.
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79 */
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80 int
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81 __udp_install_listener(udp_socket_t *s, word port, udp_handler_t handler)
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82 {
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83 udp_socket_t *p;
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84
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85 /*
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86 * Make sure we only have one handler per port.
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87 */
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88 for (p = udp_list; p; p = p->next)
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89 if (p->our_port == port)
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90 return -1;
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91
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92 s->our_port = htons(port);
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93 s->handler = handler;
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94 s->next = udp_list;
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95 udp_list = s;
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96
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97 return 0;
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98 }
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99
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100
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101 /*
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102 * Remove the handler for the given socket.
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103 */
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104 void
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105 __udp_remove_listener(word port)
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106 {
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107 udp_socket_t *prev, *s;
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108
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109 for (prev = NULL, s = udp_list; s; prev = s, s = s->next)
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110 if (s->our_port == htons(port)) {
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111 if (prev)
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112 prev->next = s->next;
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113 else
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114 udp_list = s->next;
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115 }
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116 }
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117
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118
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119 /*
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120 * Handle incoming UDP packets.
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121 */
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122 void
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123 __udp_handler(pktbuf_t *pkt, ip_route_t *r)
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124 {
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125 udp_header_t *udp = pkt->udp_hdr;
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126 ip_header_t *ip = pkt->ip_hdr;
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127 udp_socket_t *s;
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128
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129 if (udp->checksum == 0xffff)
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130 udp->checksum = 0;
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131
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132 /* copy length for pseudo sum calculation */
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133 ip->length = udp->length;
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134
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135 if (__sum((word *)udp, ntohs(udp->length), __pseudo_sum(ip)) == 0) {
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136 for (s = udp_list; s; s = s->next) {
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137 if (s->our_port == udp->dest_port) {
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138 (*s->handler)(s, ((char *)udp) + sizeof(udp_header_t),
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139 ntohs(udp->length) - sizeof(udp_header_t),
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140 r, ntohs(udp->src_port));
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141 __pktbuf_free(pkt);
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142 return;
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143 }
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144 }
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145 }
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146 __pktbuf_free(pkt);
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147 }
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148
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149
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150 /*
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151 * Send a UDP packet.
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152 */
231
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153 int
115
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154 __udp_send(char *buf, int len, ip_route_t *dest_ip,
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155 word dest_port, word src_port)
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156 {
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157 pktbuf_t *pkt;
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158 udp_header_t *udp;
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159 ip_header_t *ip;
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160 unsigned short cksum;
231
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161 int ret;
115
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162
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163 /* dumb */
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164 if (len > MAX_UDP_DATA)
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165 return -1;
115
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166
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167 /* just drop it if can't get a buffer */
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168 if ((pkt = __pktbuf_alloc(ETH_MAX_PKTLEN)) == NULL)
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169 return -1;
115
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170
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171 udp = pkt->udp_hdr;
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172 ip = pkt->ip_hdr;
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173
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174 pkt->pkt_bytes = len + sizeof(udp_header_t);
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175
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176 udp->src_port = htons(src_port);
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177 udp->dest_port = htons(dest_port);
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178 udp->length = htons(pkt->pkt_bytes);
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179 udp->checksum = 0;
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180
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181 memcpy(((char *)udp) + sizeof(udp_header_t), buf, len);
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182
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183 /* fill in some pseudo-header fields */
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184 memcpy(ip->source, __local_ip_addr, sizeof(ip_addr_t));
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185 memcpy(ip->destination, dest_ip->ip_addr, sizeof(ip_addr_t));
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186 ip->protocol = IP_PROTO_UDP;
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187 ip->length = udp->length;
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188
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189 cksum = __sum((word *)udp, pkt->pkt_bytes, __pseudo_sum(ip));
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190 udp->checksum = htons(cksum);
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191
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192 ret = __ip_send(pkt, IP_PROTO_UDP, dest_ip);
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193 __pktbuf_free(pkt);
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194 return ret;
115
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195 }
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196
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197 int
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198 __udp_sendto(char *data, int len, struct sockaddr_in *server,
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199 struct sockaddr_in *local)
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200 {
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201 ip_route_t rt;
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202
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203 if (__arp_lookup((ip_addr_t *)&server->sin_addr, &rt) < 0) {
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204 diag_printf("%s: Can't find address of server\n", __FUNCTION__);
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205 return -1;
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206 } else {
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207 __udp_send(data, len, &rt, ntohs(server->sin_port), ntohs(local->sin_port));
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208 return 0;
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209 }
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210 }
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211
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212 static char *recvfrom_buf;
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213 static int recvfrom_len;
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214 static struct sockaddr_in *recvfrom_server;
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215
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216 static void
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217 __udp_recvfrom_handler(udp_socket_t *skt, char *buf, int len,
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218 ip_route_t *src_route, word src_port)
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219 {
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220 if (recvfrom_server == NULL || recvfrom_buf == NULL)
161
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221 return;
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222
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223 if (recvfrom_server->sin_port && recvfrom_server->sin_port != htons(src_port))
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224 return;
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225
115
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226 // Move data to waiting buffer
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227 recvfrom_len = len;
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228 memcpy(recvfrom_buf, buf, len);
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229 if (recvfrom_server) {
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230 recvfrom_server->sin_port = htons(src_port);
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231 memcpy(&recvfrom_server->sin_addr, &src_route->ip_addr, sizeof(src_route->ip_addr));
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232 recvfrom_buf = (char *)0; // Tell reader we got a packet
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233 } else {
182
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234 diag_printf("udp_recvfrom - dropped packet of %d bytes\n", len);
115
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235 }
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236 }
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237
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238 int
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239 __udp_recvfrom(char *data, int len, struct sockaddr_in *server,
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240 struct sockaddr_in *local, struct timeval *timo)
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241 {
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242 int res, my_port, total_ms;
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243 udp_socket_t skt;
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244 unsigned long start;
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245
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246 my_port = ntohs(local->sin_port);
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247 if (__udp_install_listener(&skt, my_port, __udp_recvfrom_handler) < 0) {
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248 return -1;
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249 }
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250 recvfrom_buf = data;
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251 recvfrom_len = len;
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252 recvfrom_server = server;
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253 total_ms = (timo->tv_sec * 1000) + (timo->tv_usec / 1000);
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254 start = MS_TICKS();
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255 res = -1;
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256 do {
115
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257 __enet_poll(); // Handle the hardware
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258 if (!recvfrom_buf) {
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259 // Data have arrived
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260 res = recvfrom_len;
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261 break;
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262 }
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263 } while ((MS_TICKS_DELAY() - start) < total_ms);
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264 __udp_remove_listener(my_port);
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265 return res;
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266 }