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annotate packages/redboot/current/src/net/tcp.c @ 143:6b5f480c6929 ecos-sw-2000-12-08

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Merge from eCos master repository on 2000-12-08-02:09:36-GMT
author jlarmour
date Fri, 08 Dec 2000 03:30:06 +0000
parents 6ed91473a1cd
children 52c99470ec11
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1 //==========================================================================
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2 //
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3 // net/tcp.c
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4 //
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5 // Stand-alone TCP networking support for RedBoot
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): gthomas
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35 // Contributors: gthomas
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36 // Date: 2000-07-14
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37 // Purpose:
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38 // Description:
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39 //
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40 // This code is part of RedBoot (tm).
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41 //
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42 //####DESCRIPTIONEND####
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43 //
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44 //==========================================================================
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45
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46 #include <net/net.h>
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47
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48 #define MAX_TCP_SEGMENT (ETH_MAX_PKTLEN - (sizeof(eth_header_t) + sizeof(ip_header_t)))
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49 #define MAX_TCP_DATA (MAX_TCP_SEGMENT - sizeof(tcp_header_t))
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50
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51
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52 /* sequence number comparison macros */
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53 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
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54 #define SEQ_LE(a,b) ((int)((a)-(b)) <= 0)
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55 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
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56 #define SEQ_GE(a,b) ((int)((a)-(b)) >= 0)
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57
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58
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59 static void do_retrans(void *p);
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60 static void do_close(void *p);
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61
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62 #ifdef BSP_LOG
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63 static char *
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64 flags_to_str(octet f)
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65 {
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66 static char str[7], *p;
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67
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68 p = str;
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69
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70 if (f & TCP_FLAG_FIN)
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71 *p++ = 'F';
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72 if (f & TCP_FLAG_SYN)
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73 *p++ = 'S';
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74 if (f & TCP_FLAG_RST)
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75 *p++ = 'R';
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76 if (f & TCP_FLAG_PSH)
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77 *p++ = 'P';
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78 if (f & TCP_FLAG_ACK)
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79 *p++ = 'A';
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80 if (f & TCP_FLAG_URG)
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81 *p++ = 'U';
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82 *p = '\0';
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83 return str;
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84 }
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85 #endif
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86
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87 /*
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88 * A major assumption is that only a very small number of sockets will
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89 * active, so a simple linear search of those sockets is acceptible.
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90 */
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91 static tcp_socket_t *tcp_list;
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92
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93 /*
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94 * Format and send an outgoing segment.
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95 */
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96 static void
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97 tcp_send(tcp_socket_t *s, int flags, int resend)
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98 {
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99 tcp_header_t *tcp;
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100 ip_header_t *ip;
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101 pktbuf_t *pkt = &s->pkt;
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102 unsigned short cksum;
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103 dword tcp_magic;
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104 int tcp_magic_size = sizeof(tcp_magic);
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105
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106 ip = pkt->ip_hdr;
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107 tcp = pkt->tcp_hdr;
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108
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109 if (flags & TCP_FLAG_SYN) {
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110 /* If SYN, assume no data and send MSS option in tcp header */
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111 pkt->pkt_bytes = sizeof(tcp_header_t) + 4;
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112 tcp->hdr_len = 6;
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113 tcp_magic = htonl(0x02040000 | MAX_TCP_DATA);
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114 memcpy((unsigned char *)(tcp+1), &tcp_magic, tcp_magic_size);
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115 s->data_bytes = 0;
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116 } else {
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117 pkt->pkt_bytes = s->data_bytes + sizeof(tcp_header_t);
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118 tcp->hdr_len = 5;
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119 }
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120
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121 /* tcp header */
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122 tcp->reserved = 0;
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123 tcp->seqnum = htonl(s->seq);
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124 tcp->acknum = htonl(s->ack);
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125 tcp->checksum = 0;
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126
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127 if (!resend) {
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128 tcp->src_port = htons(s->our_port);
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129 tcp->dest_port = htons(s->his_port);
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130 tcp->flags = flags;
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131 /* always set PUSH flag if sending data */
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132 if (s->data_bytes)
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133 tcp->flags |= TCP_FLAG_PSH;
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134 tcp->window = htons(MAX_TCP_DATA);
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135 tcp->urgent = 0;
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136
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137 /* fill in some pseudo-header fields */
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138 memcpy(ip->source, __local_ip_addr, sizeof(ip_addr_t));
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139 memcpy(ip->destination, s->his_addr.ip_addr, sizeof(ip_addr_t));
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140 ip->protocol = IP_PROTO_TCP;
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141 }
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142
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143 /* another pseudo-header field */
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144 ip->length = htons(pkt->pkt_bytes);
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145
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146 /* compute tcp checksum */
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147 cksum = __sum((word *)tcp, pkt->pkt_bytes, __pseudo_sum(ip));
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148 tcp->checksum = htons(cksum);
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149
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150 __ip_send(pkt, IP_PROTO_TCP, &s->his_addr);
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151
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152 BSPLOG(bsp_log("tcp_send: state[%d] flags[%s] ack[%x] data[%d].\n",
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153 s->state, flags_to_str(tcp->flags), s->ack, s->data_bytes));
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154
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155 if (s->state == _TIME_WAIT)
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156 __timer_set(&s->timer, 120000, do_close, s);
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157 else if ((tcp->flags & (TCP_FLAG_FIN | TCP_FLAG_SYN)) || s->data_bytes)
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158 __timer_set(&s->timer, 1000, do_retrans, s);
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159 }
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160
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161
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162 /*
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163 * Send a reset for a bogus incoming segment.
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164 */
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165 static void
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166 send_reset(pktbuf_t *pkt, ip_route_t *r)
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167 {
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168 ip_header_t *ip = pkt->ip_hdr;
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169 tcp_header_t *tcp = pkt->tcp_hdr;
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170 dword seq, ack;
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171 word src, dest;
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172 word cksum;
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173
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174 seq = ntohl(tcp->acknum);
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175 ack = ntohl(tcp->seqnum);
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176 src = ntohs(tcp->dest_port);
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177 dest = ntohs(tcp->src_port);
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178
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179 tcp = (tcp_header_t *)(ip + 1);
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180 pkt->pkt_bytes = sizeof(tcp_header_t);
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181
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182 /* tcp header */
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183 tcp->hdr_len = 5;
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184 tcp->reserved = 0;
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185 tcp->seqnum = htonl(seq);
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186 tcp->acknum = htonl(ack);
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187 tcp->window = htons(1024);
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188 tcp->urgent = 0;
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189 tcp->checksum = 0;
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190 tcp->src_port = htons(src);
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191 tcp->dest_port = htons(dest);
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192 tcp->flags = TCP_FLAG_RST | TCP_FLAG_ACK;
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193
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194 /* fill in some pseudo-header fields */
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195 memcpy(ip->source, __local_ip_addr, sizeof(ip_addr_t));
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196 memcpy(ip->destination, r->ip_addr, sizeof(ip_addr_t));
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197 ip->protocol = IP_PROTO_TCP;
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198 ip->length = htons(pkt->pkt_bytes);
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199
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200 /* compute tcp checksum */
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201 cksum = __sum((word *)tcp, pkt->pkt_bytes, __pseudo_sum(ip));
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202 tcp->checksum = htons(cksum);
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203
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204 __ip_send(pkt, IP_PROTO_TCP, r);
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205 }
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206
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207
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208
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209 /*
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210 * Remove given socket from socket list.
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211 */
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212 static void
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213 unlink_socket(tcp_socket_t *s)
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214 {
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215 tcp_socket_t *prev, *tp;
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216
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217 for (prev = NULL, tp = tcp_list; tp; prev = tp, tp = tp->next)
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218 if (tp == s) {
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219 BSPLOG(bsp_log("unlink tcp socket.\n"));
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220 if (prev)
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221 prev->next = s->next;
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222 else
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223 tcp_list = s->next;
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224 }
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225 }
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226
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227 /*
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228 * Retransmit last packet.
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229 */
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230 static void
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231 do_retrans(void *p)
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232 {
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233 BSPLOG(bsp_log("tcp do_retrans.\n"));
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234 tcp_send((tcp_socket_t *)p, 0, 1);
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235 }
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236
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237
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238 static void
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239 do_close(void *p)
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240 {
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241 BSPLOG(bsp_log("tcp do_close.\n"));
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242 /* close connection */
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243 ((tcp_socket_t *)p)->state = _CLOSED;
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244 unlink_socket(p);
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245 }
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246
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247
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248 static void
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249 free_rxlist(tcp_socket_t *s)
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250 {
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251 pktbuf_t *p;
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252
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253 BSPLOG(bsp_log("tcp free_rxlist.\n"));
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254
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255 while ((p = s->rxlist) != NULL) {
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256 s->rxlist = p->next;
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257 __pktbuf_free(p);
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258 }
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259 }
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260
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261
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262 /*
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263 * Handle a conection reset.
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264 */
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265 static void
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266 do_reset(tcp_socket_t *s)
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267 {
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268 /* close connection */
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269 s->state = _CLOSED;
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270 __timer_cancel(&s->timer);
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271 free_rxlist(s);
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272 unlink_socket(s);
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273 }
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274
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275
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276 /*
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277 * Extract data from incoming tcp segment.
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278 * Returns true if packet is queued on rxlist, false otherwise.
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279 */
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280 static int
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281 handle_data(tcp_socket_t *s, pktbuf_t *pkt)
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282 {
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283 tcp_header_t *tcp = pkt->tcp_hdr;
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284 unsigned int diff, seq;
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285 int data_len;
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286 char *data_ptr;
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parents:
diff changeset
287 pktbuf_t *p;
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diff changeset
288
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diff changeset
289 data_len = pkt->pkt_bytes - (tcp->hdr_len << 2);
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290 data_ptr = ((char *)tcp) + (tcp->hdr_len << 2);
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diff changeset
291
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diff changeset
292 seq = ntohl(tcp->seqnum);
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diff changeset
293
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294 BSPLOG(bsp_log("tcp data: seq[%x] len[%d].\n", seq, data_len));
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diff changeset
295
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parents:
diff changeset
296 if (SEQ_LE(seq, s->ack)) {
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jlarmour
parents:
diff changeset
297 /*
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jlarmour
parents:
diff changeset
298 * Figure difference between which byte we're expecting and which byte
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parents:
diff changeset
299 * is sent first. Adjust data length and data pointer accordingly.
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diff changeset
300 */
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diff changeset
301 diff = s->ack - seq;
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diff changeset
302 data_len -= diff;
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diff changeset
303 data_ptr += diff;
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diff changeset
304
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parents:
diff changeset
305 if (data_len > 0) {
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jlarmour
parents:
diff changeset
306 /* queue the new data */
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diff changeset
307 s->ack += data_len;
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diff changeset
308 pkt->next = NULL;
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parents:
diff changeset
309 if ((p = s->rxlist) != NULL) {
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parents:
diff changeset
310 while (p->next)
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diff changeset
311 p = p->next;
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diff changeset
312 p->next = pkt;
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313 BSPLOG(bsp_log("tcp data: Add pkt[%x] len[%d].\n",
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diff changeset
314 pkt, data_len));
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diff changeset
315 } else {
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diff changeset
316 s->rxlist = pkt;
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diff changeset
317 s->rxcnt = data_len;
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diff changeset
318 s->rxptr = data_ptr;
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diff changeset
319 BSPLOG(bsp_log("tcp data: pkt[%x] len[%d].\n",
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diff changeset
320 pkt, data_len));
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321 }
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diff changeset
322 return 1;
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323 }
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324 }
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diff changeset
325 return 0;
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diff changeset
326 }
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diff changeset
327
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diff changeset
328
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diff changeset
329 static void
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diff changeset
330 handle_ack(tcp_socket_t *s, pktbuf_t *pkt)
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331 {
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diff changeset
332 tcp_header_t *tcp = pkt->tcp_hdr;
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diff changeset
333 dword ack;
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diff changeset
334 int advance;
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diff changeset
335 char *dp;
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diff changeset
336
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parents:
diff changeset
337 /* process ack value in packet */
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diff changeset
338 ack = ntohl(tcp->acknum);
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339
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340 BSPLOG(bsp_log("Rcvd tcp ACK %x\n", ack));
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341
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diff changeset
342 if (SEQ_GT(ack, s->seq)) {
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diff changeset
343 __timer_cancel(&s->timer);
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diff changeset
344 advance = ack - s->seq;
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diff changeset
345 if (advance > s->data_bytes)
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diff changeset
346 advance = s->data_bytes;
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diff changeset
347
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348 BSPLOG(bsp_log("seq advance %d", advance));
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349
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diff changeset
350 if (advance > 0) {
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diff changeset
351 s->seq += advance;
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diff changeset
352 s->data_bytes -= advance;
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diff changeset
353 if (s->data_bytes) {
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diff changeset
354 /* other end ack'd only part of the pkt */
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355 BSPLOG(bsp_log(" %d bytes left", s->data_bytes));
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356 dp = (char *)(s->pkt.tcp_hdr + 1);
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diff changeset
357 memcpy(dp, dp + advance, s->data_bytes);
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diff changeset
358 }
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diff changeset
359 }
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diff changeset
360 }
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diff changeset
361 BSPLOG(bsp_log("\n"));
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diff changeset
362 }
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diff changeset
363
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diff changeset
364
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diff changeset
365 /*
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jlarmour
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diff changeset
366 * Handle incoming TCP packets.
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diff changeset
367 */
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diff changeset
368 void
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diff changeset
369 __tcp_handler(pktbuf_t *pkt, ip_route_t *r)
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diff changeset
370 {
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diff changeset
371 tcp_header_t *tcp = pkt->tcp_hdr;
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diff changeset
372 ip_header_t *ip = pkt->ip_hdr;
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diff changeset
373 tcp_socket_t *prev,*s;
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diff changeset
374 dword ack;
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diff changeset
375 int queued = 0;
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diff changeset
376
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jlarmour
parents:
diff changeset
377 /* set length for pseudo sum calculation */
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diff changeset
378 ip->length = htons(pkt->pkt_bytes);
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diff changeset
379
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diff changeset
380 if (__sum((word *)tcp, pkt->pkt_bytes, __pseudo_sum(ip)) == 0) {
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diff changeset
381 for (prev = NULL, s = tcp_list; s; prev = s, s = s->next) {
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parents:
diff changeset
382 if (s->our_port == ntohs(tcp->dest_port)) {
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jlarmour
parents:
diff changeset
383 if (s->his_port == 0)
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jlarmour
parents:
diff changeset
384 break;
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parents:
diff changeset
385 if (s->his_port == ntohs(tcp->src_port) &&
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jlarmour
parents:
diff changeset
386 !memcmp(r->ip_addr, s->his_addr.ip_addr, sizeof(ip_addr_t)))
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jlarmour
parents:
diff changeset
387 break;
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jlarmour
parents:
diff changeset
388 }
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jlarmour
parents:
diff changeset
389 }
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jlarmour
parents:
diff changeset
390
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jlarmour
parents:
diff changeset
391 if (s) {
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jlarmour
parents:
diff changeset
392 /* found the socket this packet belongs to */
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jlarmour
parents:
diff changeset
393
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jlarmour
parents:
diff changeset
394 /* refresh his ethernet address */
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diff changeset
395 memcpy(s->his_addr.enet_addr, r->enet_addr, sizeof(enet_addr_t));
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jlarmour
parents:
diff changeset
396
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jlarmour
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diff changeset
397 if (s->state != _SYN_RCVD && tcp->flags & TCP_FLAG_RST) {
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jlarmour
parents:
diff changeset
398 BSPLOG(bsp_log("TCP_FLAG_RST rcvd\n"));
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jlarmour
parents:
diff changeset
399 do_reset(s);
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jlarmour
parents:
diff changeset
400 __pktbuf_free(pkt);
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jlarmour
parents:
diff changeset
401 return;
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jlarmour
parents:
diff changeset
402 }
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jlarmour
parents:
diff changeset
403
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jlarmour
parents:
diff changeset
404 switch (s->state) {
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jlarmour
parents:
diff changeset
405
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jlarmour
parents:
diff changeset
406 case _SYN_SENT:
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jlarmour
parents:
diff changeset
407 /* active open not supported */
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jlarmour
parents:
diff changeset
408 break;
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jlarmour
parents:
diff changeset
409
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jlarmour
parents:
diff changeset
410 case _LISTEN:
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jlarmour
parents:
diff changeset
411 if (tcp->flags & TCP_FLAG_SYN) {
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jlarmour
parents:
diff changeset
412 s->state = _SYN_RCVD;
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jlarmour
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diff changeset
413 s->ack = ntohl(tcp->seqnum) + 1;
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jlarmour
parents:
diff changeset
414 s->his_port = ntohs(tcp->src_port);
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jlarmour
parents:
diff changeset
415 memcpy(s->his_addr.ip_addr, r->ip_addr, sizeof(ip_addr_t));
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jlarmour
parents:
diff changeset
416 s->data_bytes = 0;
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jlarmour
parents:
diff changeset
417 s->ack_pending = 0;
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jlarmour
parents:
diff changeset
418
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jlarmour
parents:
diff changeset
419 BSPLOG(bsp_log("SYN from %d.%d.%d.%d:%d (seq %x)\n",
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jlarmour
parents:
diff changeset
420 s->his_addr.ip_addr[0],s->his_addr.ip_addr[1],
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jlarmour
parents:
diff changeset
421 s->his_addr.ip_addr[2],s->his_addr.ip_addr[3],
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jlarmour
parents:
diff changeset
422 s->his_port, ntohl(tcp->seqnum)));
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jlarmour
parents:
diff changeset
423
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jlarmour
parents:
diff changeset
424 tcp_send(s, TCP_FLAG_SYN | TCP_FLAG_ACK, 0);
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jlarmour
parents:
diff changeset
425 }
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jlarmour
parents:
diff changeset
426 else
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jlarmour
parents:
diff changeset
427 send_reset(pkt, r);
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jlarmour
parents:
diff changeset
428 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
429
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
430 case _SYN_RCVD:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
431 BSPLOG(bsp_log("_SYN_RCVD timer cancel.\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
432 __timer_cancel(&s->timer);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
433
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
434 /* go back to _LISTEN state if reset */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
435 if (tcp->flags & TCP_FLAG_RST) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
436 s->state = _LISTEN;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
437
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
438 BSPLOG(bsp_log("_SYN_RCVD --> _LISTEN\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
439
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
440 } else if (tcp->flags & TCP_FLAG_SYN) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
441 /* apparently our SYN/ACK was lost? */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
442 tcp_send(s, 0, 1);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
443
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
444 BSPLOG(bsp_log("retransmitting SYN/ACK\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
445
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
446 } else if ((tcp->flags & TCP_FLAG_ACK) &&
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
447 ntohl(tcp->acknum) == (s->seq + 1)) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
448 /* we've established the connection */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
449 s->state = _ESTABLISHED;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
450 s->seq++;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
451
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
452 BSPLOG(bsp_log("ACK received - connection established\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
453 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
454 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
455
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
456 case _ESTABLISHED:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
457 case _CLOSE_WAIT:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
458 ack = s->ack; /* save original ack */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
459 if (tcp->flags & TCP_FLAG_ACK)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
460 handle_ack(s, pkt);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
461
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
462 queued = handle_data(s, pkt);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
463
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
464 if ((tcp->flags & TCP_FLAG_FIN) &&
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
465 ntohl(tcp->seqnum) == s->ack) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
466
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
467 BSPLOG(bsp_log("FIN received - going to _CLOSE_WAIT\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
468
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
469 s->ack++;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
470 s->state = _CLOSE_WAIT;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
471 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
472 /*
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
473 * Send an ack if neccessary.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
474 */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
475 if (s->ack != ack || s->ack_pending) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
476 /*
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
477 * we can't send an ack if our write packet is holding outgoing
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
478 * data pending an incoming ack.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
479 */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
480 if (s->data_bytes == 0) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
481 BSPLOG(bsp_log("Sending ack: new[%x] old[%x]\n",
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
482 s->ack, ack));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
483 __timer_cancel(&s->timer);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
484 tcp_send(s, TCP_FLAG_ACK, 0);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
485 s->ack_pending = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
486 } else
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
487 s->ack_pending = 1;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
488 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
489 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
490
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
491 case _LAST_ACK:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
492 if (tcp->flags & TCP_FLAG_ACK) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
493 handle_ack(s, pkt);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
494 if (ntohl(tcp->acknum) == (s->seq + 1)) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
495 BSPLOG(bsp_log("_LAST_ACK --> _CLOSED\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
496 s->state = _CLOSED;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
497 unlink_socket(s);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
498 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
499 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
500 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
501
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
502 case _FIN_WAIT_1:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
503 if (tcp->flags & TCP_FLAG_ACK) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
504 handle_ack(s, pkt);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
505 if (ntohl(tcp->acknum) == (s->seq + 1)) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
506 /* got ACK for FIN packet */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
507 if (tcp->flags & TCP_FLAG_FIN) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
508 BSPLOG(bsp_log("_FIN_WAIT_1 --> _TIME_WAIT\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
509 s->ack++;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
510 s->state = _TIME_WAIT;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
511 tcp_send(s, TCP_FLAG_ACK, 0);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
512 } else {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
513 s->state = _FIN_WAIT_2;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
514 BSPLOG(bsp_log("_FIN_WAIT_1 --> _FIN_WAIT_2\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
515 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
516 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
517 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
518 if (tcp->flags & TCP_FLAG_FIN) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
519 BSPLOG(bsp_log("_FIN_WAIT_1 --> _CLOSING\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
520 __timer_cancel(&s->timer);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
521 s->ack++;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
522 s->state = _CLOSING;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
523 tcp_send(s, TCP_FLAG_FIN | TCP_FLAG_ACK, 0);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
524 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
525 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
526
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
527 case _FIN_WAIT_2:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
528 queued = handle_data(s, pkt);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
529 if (tcp->flags & TCP_FLAG_FIN) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
530 BSPLOG(bsp_log("_FIN_WAIT_2 --> _TIME_WAIT\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
531 s->ack++;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
532 s->state = _TIME_WAIT;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
533 tcp_send(s, TCP_FLAG_ACK, 0);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
534 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
535 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
536
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
537 case _CLOSING:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
538 if (tcp->flags & TCP_FLAG_ACK) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
539 handle_ack(s, pkt);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
540 if (ntohl(tcp->acknum) == (s->seq + 1)) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
541 /* got ACK for FIN packet */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
542 BSPLOG(bsp_log("_CLOSING --> _TIME_WAIT\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
543 __timer_cancel(&s->timer);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
544 s->state = _TIME_WAIT;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
545 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
546 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
547 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
548
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
549 case _TIME_WAIT:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
550 BSPLOG(bsp_log("_TIME_WAIT resend.\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
551 tcp_send(s, 0, 1); /* just resend ack */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
552 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
553 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
554 } else {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
555 BSPLOG(bsp_log("Unexpected segment from: %d.%d.%d.%d:%d\n",
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
556 r->ip_addr[0], r->ip_addr[1], r->ip_addr[3],
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
557 r->ip_addr[4], ntohs(tcp->src_port)));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
558 send_reset(pkt, r);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
559 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
560 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
561 if (!queued)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
562 __pktbuf_free(pkt);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
563 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
564
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
565
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
566 void
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
567 __tcp_poll(void)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
568 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
569 __enet_poll();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
570 __timer_poll();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
571 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
572
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
573
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
574 int
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
575 __tcp_listen(tcp_socket_t *s, word port)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
576 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
577 BSPLOG(bsp_log("tcp_listen: s[%p] port[%x]\n", s, port));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
578
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
579 memset(s, 0, sizeof(tcp_socket_t));
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jlarmour
parents:
diff changeset
580 s->state = _LISTEN;
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jlarmour
parents:
diff changeset
581 s->our_port = port;
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jlarmour
parents:
diff changeset
582 s->pkt.buf = (word *)s->pktbuf;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
583 s->pkt.bufsize = ETH_MAX_PKTLEN;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
584 #if 0
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jlarmour
parents:
diff changeset
585 s->pkt.eth_hdr = (eth_header_t *)s->pkt.buf;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
586 s->pkt.ip_hdr = (ip_header_t *)(s->pkt.eth_hdr + 1);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
587 #else
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
588 s->pkt.ip_hdr = (ip_header_t *)s->pkt.buf;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
589 #endif
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
590 s->pkt.tcp_hdr = (tcp_header_t *)(s->pkt.ip_hdr + 1);
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jlarmour
parents:
diff changeset
591
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
592 s->next = tcp_list;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
593
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
594 #if 1
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jlarmour
parents:
diff changeset
595 /* limit to one open socket at a time */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
596 if (s->next) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
597 BSPLOG(bsp_log("tcp_listen: recursion error\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
598 BSPLOG(while(1));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
599 }
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jlarmour
parents:
diff changeset
600 #endif
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jlarmour
parents:
diff changeset
601
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
602 tcp_list = s;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
603
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
604 return 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
605 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
606
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
607
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
608 /*
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
609 * Block while waiting for all data to be transmitted.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
610 */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
611 void
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
612 __tcp_drain(tcp_socket_t *s)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
613 {
143
6b5f480c6929 Merge from eCos master repository on 2000-12-08-02:09:36-GMT
jlarmour
parents: 115
diff changeset
614 // BSPLOG(bsp_log("__tcp_drain.\n"));
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
615 while (s->state != _CLOSED && s->data_bytes)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
616 __tcp_poll();
143
6b5f480c6929 Merge from eCos master repository on 2000-12-08-02:09:36-GMT
jlarmour
parents: 115
diff changeset
617 // BSPLOG(bsp_log("__tcp_drain done.\n"));
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
618 }
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jlarmour
parents:
diff changeset
619
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
620
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
621
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
622 /*
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
623 * Close the tcp connection.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
624 */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
625 void
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
626 __tcp_close(tcp_socket_t *s)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
627 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
628 __tcp_drain(s);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
629 if (s->state == _ESTABLISHED || s->state == _SYN_RCVD) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
630 BSPLOG(bsp_log("__tcp_close: going to _FIN_WAIT_1\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
631 s->state = _FIN_WAIT_1;
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jlarmour
parents:
diff changeset
632 tcp_send(s, TCP_FLAG_ACK | TCP_FLAG_FIN, 0);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
633 } else if (s->state == _CLOSE_WAIT) {
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jlarmour
parents:
diff changeset
634
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
635 BSPLOG(bsp_log("__tcp_close: going to _LAST_ACK\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
636
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jlarmour
parents:
diff changeset
637 s->state = _LAST_ACK;
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jlarmour
parents:
diff changeset
638 tcp_send(s, TCP_FLAG_ACK | TCP_FLAG_FIN, 0);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
639 }
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jlarmour
parents:
diff changeset
640 free_rxlist(s);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
641 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
642
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
643
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
644 /*
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
645 * Wait for connection to be fully closed.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
646 */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
647 void
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
648 __tcp_close_wait(tcp_socket_t *s)
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jlarmour
parents:
diff changeset
649 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
650 BSPLOG(bsp_log("__tcp_close_wait.\n"));
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jlarmour
parents:
diff changeset
651 while (s->state != _CLOSED)
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jlarmour
parents:
diff changeset
652 __tcp_poll();
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jlarmour
parents:
diff changeset
653 BSPLOG(bsp_log("__tcp_close_wait done.\n"));
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jlarmour
parents:
diff changeset
654 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
655
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
656
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
657 /*
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
658 * Read up to 'len' bytes without blocking.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
659 */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
660 int
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
661 __tcp_read(tcp_socket_t *s, char *buf, int len)
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jlarmour
parents:
diff changeset
662 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
663 int nread;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
664 pktbuf_t *pkt;
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jlarmour
parents:
diff changeset
665 tcp_header_t *tcp;
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jlarmour
parents:
diff changeset
666
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
667 if (len <= 0 || s->rxcnt == 0)
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jlarmour
parents:
diff changeset
668 return 0;
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jlarmour
parents:
diff changeset
669
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
670 if (s->state != _ESTABLISHED && s->rxcnt == 0)
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jlarmour
parents:
diff changeset
671 return -1;
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jlarmour
parents:
diff changeset
672
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
673 nread = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
674 while (len) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
675 if (len < s->rxcnt) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
676 memcpy(buf, s->rxptr, len);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
677 BSPLOG(bsp_log("tcp_read: read %d bytes.\n", len));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
678 s->rxptr += len;
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jlarmour
parents:
diff changeset
679 s->rxcnt -= len;
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jlarmour
parents:
diff changeset
680 nread += len;
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jlarmour
parents:
diff changeset
681
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
682 BSPLOG(bsp_log("tcp_read: %d bytes left in rxlist head.\n",
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
683 s->rxcnt));
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jlarmour
parents:
diff changeset
684
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
685 break;
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jlarmour
parents:
diff changeset
686 } else {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
687 memcpy(buf, s->rxptr, s->rxcnt);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
688 BSPLOG(bsp_log("tcp_read: read %d bytes. pkt[%x] freed.\n",
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
689 s->rxcnt, s->rxlist));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
690 nread += s->rxcnt;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
691 buf += s->rxcnt;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
692 len -= s->rxcnt;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
693
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
694 /* setup for next packet in list */
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
695 pkt = s->rxlist;
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jlarmour
parents:
diff changeset
696 s->rxlist = pkt->next;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
697 __pktbuf_free(pkt);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
698
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
699 if ((pkt = s->rxlist) != NULL) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
700 tcp = pkt->tcp_hdr;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
701 s->rxcnt = pkt->pkt_bytes - (tcp->hdr_len << 2);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
702 s->rxptr = ((char *)tcp) + (tcp->hdr_len << 2);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
703
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
704 BSPLOG(bsp_log("tcp_read: next pkt[%x] has %d bytes.\n",
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
705 s->rxlist, s->rxcnt));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
706 } else {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
707
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
708 BSPLOG(bsp_log("tcp_read: no more data.\n"));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
709
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
710 s->rxcnt = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
711 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
712 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
713 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
714 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
715 return nread;
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jlarmour
parents:
diff changeset
716 }
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jlarmour
parents:
diff changeset
717
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jlarmour
parents:
diff changeset
718
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jlarmour
parents:
diff changeset
719 int
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jlarmour
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diff changeset
720 __tcp_write(tcp_socket_t *s, char *buf, int len)
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jlarmour
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diff changeset
721 {
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jlarmour
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diff changeset
722 tcp_header_t *tcp = s->pkt.tcp_hdr;
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jlarmour
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diff changeset
723
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jlarmour
parents:
diff changeset
724 if (len <= 0)
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jlarmour
parents:
diff changeset
725 return 0;
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jlarmour
parents:
diff changeset
726
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jlarmour
parents:
diff changeset
727 if (s->state != _ESTABLISHED && s->state != _CLOSE_WAIT)
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jlarmour
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diff changeset
728 return -1;
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jlarmour
parents:
diff changeset
729
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jlarmour
parents:
diff changeset
730 if (s->data_bytes)
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jlarmour
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diff changeset
731 return 0;
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jlarmour
parents:
diff changeset
732
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jlarmour
parents:
diff changeset
733 if (len > MAX_TCP_DATA)
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jlarmour
parents:
diff changeset
734 len = MAX_TCP_DATA;
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jlarmour
parents:
diff changeset
735
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jlarmour
parents:
diff changeset
736 memcpy(tcp + 1, buf, len);
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jlarmour
parents:
diff changeset
737 s->data_bytes = len;
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jlarmour
parents:
diff changeset
738
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jlarmour
parents:
diff changeset
739 tcp_send(s, TCP_FLAG_ACK, 0);
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jlarmour
parents:
diff changeset
740
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jlarmour
parents:
diff changeset
741 return len;
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jlarmour
parents:
diff changeset
742 }
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jlarmour
parents:
diff changeset
743