gpz | 452b5bd | 2003-05-19 08:21:01 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2001, Adam Dunkels. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by Adam Dunkels. |
| 16 | * 4. The name of the author may not be used to endorse or promote |
| 17 | * products derived from this software without specific prior |
| 18 | * written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS |
| 21 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 22 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| 24 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| 26 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 28 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 29 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 30 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | * This file is part of the uIP TCP/IP stack. |
| 33 | * |
oliverschmidt | a05e0b2 | 2005-02-24 22:05:24 +0000 | [diff] [blame] | 34 | * $Id: uip_arch.c,v 1.3 2005/02/24 22:05:24 oliverschmidt Exp $ |
gpz | 452b5bd | 2003-05-19 08:21:01 +0000 | [diff] [blame] | 35 | * |
| 36 | */ |
| 37 | |
| 38 | |
| 39 | #include "uip.h" |
| 40 | #include "uip_arch.h" |
| 41 | |
| 42 | #define BUF ((uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN]) |
| 43 | #define IP_PROTO_TCP 6 |
| 44 | |
| 45 | /*-----------------------------------------------------------------------------------*/ |
gpz | 452b5bd | 2003-05-19 08:21:01 +0000 | [diff] [blame] | 46 | void |
| 47 | uip_add_rcv_nxt(u16_t n) |
| 48 | { |
| 49 | uip_conn->rcv_nxt[3] += (n & 0xff); |
| 50 | uip_conn->rcv_nxt[2] += (n >> 8); |
| 51 | |
| 52 | if(uip_conn->rcv_nxt[2] < (n >> 8)) { |
| 53 | ++uip_conn->rcv_nxt[1]; |
| 54 | if(uip_conn->rcv_nxt[1] == 0) { |
| 55 | ++uip_conn->rcv_nxt[0]; |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | |
| 60 | if(uip_conn->rcv_nxt[3] < (n & 0xff)) { |
| 61 | ++uip_conn->rcv_nxt[2]; |
| 62 | if(uip_conn->rcv_nxt[2] == 0) { |
| 63 | ++uip_conn->rcv_nxt[1]; |
| 64 | if(uip_conn->rcv_nxt[1] == 0) { |
| 65 | ++uip_conn->rcv_nxt[0]; |
| 66 | } |
| 67 | } |
| 68 | } |
| 69 | } |
| 70 | /*-----------------------------------------------------------------------------------*/ |
| 71 | void |
| 72 | uip_add32(u8_t *op32, u16_t op16) |
| 73 | { |
| 74 | |
| 75 | uip_acc32[3] = op32[3] + (op16 & 0xff); |
| 76 | uip_acc32[2] = op32[2] + (op16 >> 8); |
| 77 | uip_acc32[1] = op32[1]; |
| 78 | uip_acc32[0] = op32[0]; |
| 79 | |
| 80 | if(uip_acc32[2] < (op16 >> 8)) { |
| 81 | ++uip_acc32[1]; |
| 82 | if(uip_acc32[1] == 0) { |
| 83 | ++uip_acc32[0]; |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | |
| 88 | if(uip_acc32[3] < (op16 & 0xff)) { |
| 89 | ++uip_acc32[2]; |
| 90 | if(uip_acc32[2] == 0) { |
| 91 | ++uip_acc32[1]; |
| 92 | if(uip_acc32[1] == 0) { |
| 93 | ++uip_acc32[0]; |
| 94 | } |
| 95 | } |
| 96 | } |
| 97 | } |
| 98 | /*-----------------------------------------------------------------------------------*/ |
gpz | 452b5bd | 2003-05-19 08:21:01 +0000 | [diff] [blame] | 99 | u16_t |
| 100 | uip_chksum(u16_t *sdata, u16_t len) |
| 101 | { |
| 102 | u16_t acc; |
| 103 | |
| 104 | for(acc = 0; len > 1; len -= 2) { |
| 105 | acc += *sdata; |
| 106 | if(acc < *sdata) { |
| 107 | /* Overflow, so we add the carry to acc (i.e., increase by |
| 108 | one). */ |
| 109 | ++acc; |
| 110 | } |
| 111 | ++sdata; |
| 112 | } |
| 113 | |
| 114 | /* add up any odd byte */ |
| 115 | if(len == 1) { |
| 116 | acc += htons(((u16_t)(*(u8_t *)sdata)) << 8); |
| 117 | if(acc < htons(((u16_t)(*(u8_t *)sdata)) << 8)) { |
| 118 | ++acc; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | return acc; |
| 123 | } |
| 124 | /*-----------------------------------------------------------------------------------*/ |
| 125 | u16_t |
| 126 | uip_ipchksum(void) |
| 127 | { |
oliverschmidt | a05e0b2 | 2005-02-24 22:05:24 +0000 | [diff] [blame] | 128 | return uip_chksum((u16_t *)&uip_buf[UIP_LLH_LEN], UIP_IPH_LEN); |
gpz | 452b5bd | 2003-05-19 08:21:01 +0000 | [diff] [blame] | 129 | } |
| 130 | /*-----------------------------------------------------------------------------------*/ |
| 131 | u16_t |
| 132 | uip_tcpchksum(void) |
| 133 | { |
| 134 | u16_t hsum, sum; |
| 135 | |
| 136 | |
| 137 | /* Compute the checksum of the TCP header. */ |
oliverschmidt | a05e0b2 | 2005-02-24 22:05:24 +0000 | [diff] [blame] | 138 | hsum = uip_chksum((u16_t *)&uip_buf[UIP_LLH_LEN + UIP_IPH_LEN], UIP_TCPH_LEN); |
gpz | 452b5bd | 2003-05-19 08:21:01 +0000 | [diff] [blame] | 139 | |
| 140 | /* Compute the checksum of the data in the TCP packet and add it to |
| 141 | the TCP header checksum. */ |
| 142 | sum = uip_chksum((u16_t *)uip_appdata, |
oliverschmidt | a05e0b2 | 2005-02-24 22:05:24 +0000 | [diff] [blame] | 143 | (u16_t)(((((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - |
| 144 | UIP_IPTCPH_LEN))); |
gpz | 452b5bd | 2003-05-19 08:21:01 +0000 | [diff] [blame] | 145 | |
| 146 | if((sum += hsum) < hsum) { |
| 147 | ++sum; |
| 148 | } |
| 149 | |
| 150 | if((sum += BUF->srcipaddr[0]) < BUF->srcipaddr[0]) { |
| 151 | ++sum; |
| 152 | } |
| 153 | if((sum += BUF->srcipaddr[1]) < BUF->srcipaddr[1]) { |
| 154 | ++sum; |
| 155 | } |
| 156 | if((sum += BUF->destipaddr[0]) < BUF->destipaddr[0]) { |
| 157 | ++sum; |
| 158 | } |
| 159 | if((sum += BUF->destipaddr[1]) < BUF->destipaddr[1]) { |
| 160 | ++sum; |
| 161 | } |
| 162 | if((sum += (u16_t)htons((u16_t)IP_PROTO_TCP)) < (u16_t)htons((u16_t)IP_PROTO_TCP)) { |
| 163 | ++sum; |
| 164 | } |
| 165 | |
oliverschmidt | a05e0b2 | 2005-02-24 22:05:24 +0000 | [diff] [blame] | 166 | hsum = (u16_t)HTONS((((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - UIP_IPH_LEN); |
gpz | 452b5bd | 2003-05-19 08:21:01 +0000 | [diff] [blame] | 167 | |
| 168 | if((sum += hsum) < hsum) { |
| 169 | ++sum; |
| 170 | } |
| 171 | |
| 172 | return sum; |
| 173 | } |
| 174 | /*-----------------------------------------------------------------------------------*/ |