| /* |
| * Copyright (c) 2001, Adam Dunkels. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * This product includes software developed by Adam Dunkels. |
| * 4. The name of the author may not be used to endorse or promote |
| * products derived from this software without specific prior |
| * written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS |
| * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| * This file is part of the uIP TCP/IP stack. |
| * |
| * $Id: uip_arch.c,v 1.3 2005/02/24 22:07:16 oliverschmidt Exp $ |
| * |
| */ |
| |
| |
| #include "uip.h" |
| #include "uip_arch.h" |
| |
| #define BUF ((uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN]) |
| #define IP_PROTO_TCP 6 |
| |
| /*-----------------------------------------------------------------------------------*/ |
| #if UIP_BUFSIZE > 255 |
| /*-----------------------------------------------------------------------------------*/ |
| void |
| uip_add_rcv_nxt(u16_t n) |
| { |
| uip_conn->rcv_nxt[3] += (n & 0xff); |
| uip_conn->rcv_nxt[2] += (n >> 8); |
| |
| if(uip_conn->rcv_nxt[2] < (n >> 8)) { |
| ++uip_conn->rcv_nxt[1]; |
| if(uip_conn->rcv_nxt[1] == 0) { |
| ++uip_conn->rcv_nxt[0]; |
| } |
| } |
| |
| |
| if(uip_conn->rcv_nxt[3] < (n & 0xff)) { |
| ++uip_conn->rcv_nxt[2]; |
| if(uip_conn->rcv_nxt[2] == 0) { |
| ++uip_conn->rcv_nxt[1]; |
| if(uip_conn->rcv_nxt[1] == 0) { |
| ++uip_conn->rcv_nxt[0]; |
| } |
| } |
| } |
| } |
| /*-----------------------------------------------------------------------------------*/ |
| void |
| uip_add32(u8_t *op32, u16_t op16) |
| { |
| |
| uip_acc32[3] = op32[3] + (op16 & 0xff); |
| uip_acc32[2] = op32[2] + (op16 >> 8); |
| uip_acc32[1] = op32[1]; |
| uip_acc32[0] = op32[0]; |
| |
| if(uip_acc32[2] < (op16 >> 8)) { |
| ++uip_acc32[1]; |
| if(uip_acc32[1] == 0) { |
| ++uip_acc32[0]; |
| } |
| } |
| |
| |
| if(uip_acc32[3] < (op16 & 0xff)) { |
| ++uip_acc32[2]; |
| if(uip_acc32[2] == 0) { |
| ++uip_acc32[1]; |
| if(uip_acc32[1] == 0) { |
| ++uip_acc32[0]; |
| } |
| } |
| } |
| } |
| /*-----------------------------------------------------------------------------------*/ |
| #else /* UIP_BUFSIZE > 255 */ |
| /*-----------------------------------------------------------------------------------*/ |
| void |
| uip_add_rcv_nxt(u8_t n) |
| { |
| uip_conn->rcv_nxt[3] += n; |
| if(uip_conn->rcv_nxt[3] < n) { |
| ++uip_conn->rcv_nxt[2]; |
| if(uip_conn->rcv_nxt[2] == 0) { |
| ++uip_conn->rcv_nxt[1]; |
| if(uip_conn->rcv_nxt[1] == 0) { |
| ++uip_conn->rcv_nxt[0]; |
| } |
| } |
| } |
| } |
| /*-----------------------------------------------------------------------------------*/ |
| void |
| uip_add32(u8_t *op32, u8_t op8) |
| { |
| uip_acc32[3] = op32[3] + op8; |
| uip_acc32[2] = op32[2]; |
| uip_acc32[1] = op32[1]; |
| uip_acc32[0] = op32[0]; |
| |
| if(uip_acc32[3] < op8) { |
| ++uip_acc32[2]; |
| if(uip_acc32[2] == 0) { |
| ++uip_acc32[1]; |
| if(uip_acc32[1] == 0) { |
| ++uip_acc32[0]; |
| } |
| } |
| } |
| } |
| /*-----------------------------------------------------------------------------------*/ |
| #endif /* UIP_BUFSIZE > 255 */ |
| |
| u16_t |
| uip_chksum(u16_t *sdata, u16_t len) |
| { |
| u8_t *dataptr; |
| u16_t acc; |
| |
| for(acc = 0; len > 1; len -= 2) { |
| acc += *sdata; |
| if(acc < *sdata) { |
| /* Overflow, so we add the carry to acc (i.e., increase by |
| one). */ |
| ++acc; |
| } |
| ++sdata; |
| } |
| |
| dataptr = sdata; |
| |
| /* add up any odd byte */ |
| if(len == 1) { |
| acc += htons(((u16_t)(*dataptr)) << 8); |
| if(acc < htons(((u16_t)(*dataptr)) << 8)) { |
| ++acc; |
| } |
| } |
| |
| return acc; |
| } |
| /*-----------------------------------------------------------------------------------*/ |
| u16_t |
| uip_ipchksum(void) |
| { |
| return uip_chksum((u16_t *)&uip_buf[UIP_LLH_LEN], UIP_IPH_LEN); |
| } |
| /*-----------------------------------------------------------------------------------*/ |
| u16_t |
| uip_tcpchksum(void) |
| { |
| u16_t hsum, sum; |
| |
| |
| /* Compute the checksum of the TCP header. */ |
| hsum = uip_chksum((u16_t *)&uip_buf[UIP_LLH_LEN + UIP_IPH_LEN], UIP_TCPH_LEN); |
| |
| /* Compute the checksum of the data in the TCP packet and add it to |
| the TCP header checksum. */ |
| sum = uip_chksum((u16_t *)uip_appdata, |
| (u16_t)(((((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - |
| UIP_IPTCPH_LEN))); |
| |
| |
| if((sum += hsum) < hsum) { |
| ++sum; |
| } |
| |
| if((sum += BUF->srcipaddr[0]) < BUF->srcipaddr[0]) { |
| ++sum; |
| } |
| if((sum += BUF->srcipaddr[1]) < BUF->srcipaddr[1]) { |
| ++sum; |
| } |
| if((sum += BUF->destipaddr[0]) < BUF->destipaddr[0]) { |
| ++sum; |
| } |
| if((sum += BUF->destipaddr[1]) < BUF->destipaddr[1]) { |
| ++sum; |
| } |
| if((sum += (u16_t)HTONS((u16_t)IP_PROTO_TCP)) < (u16_t)HTONS((u16_t)IP_PROTO_TCP)) { |
| ++sum; |
| } |
| |
| hsum = (u16_t)HTONS((((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - UIP_IPH_LEN); |
| |
| if((sum += hsum) < hsum) { |
| ++sum; |
| } |
| |
| return sum; |
| } |
| /*-----------------------------------------------------------------------------------*/ |