519 lines
12 KiB
C
519 lines
12 KiB
C
/*
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* Copyright (c) 2001, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the uIP TCP/IP stack.
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*
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*
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*/
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#include "net/uip.h"
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#include "net/uip_arch.h"
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#define BUF ((uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
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#define IP_PROTO_TCP 6
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#define IP_PROTO_UDP 17
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/*-----------------------------------------------------------------------------------*/
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#pragma optimize(push, off)
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void
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uip_add32(uint8_t *op32, uint16_t op16)
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{
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asm("ldy #3");
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asm("jsr ldaxysp");
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asm("sta ptr1");
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asm("stx ptr1+1");
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asm("ldy #0");
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asm("lda (sp),y");
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asm("ldy #3");
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asm("clc");
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asm("adc (ptr1),y");
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asm("sta _uip_acc32+3");
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asm("dey");
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asm("lda (ptr1),y");
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asm("ldy #1");
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asm("adc (sp),y");
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asm("sta _uip_acc32+2");
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asm("ldy #1");
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asm("lda (ptr1),y");
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asm("adc #0");
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asm("sta _uip_acc32+1");
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asm("dey");
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asm("lda (ptr1),y");
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asm("adc #0");
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asm("sta _uip_acc32+0");
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}
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#pragma optimize(pop)
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/*-----------------------------------------------------------------------------------*/
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static uint16_t chksum_ptr, chksum_len, chksum_tmp;
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static uint8_t chksum_protocol;
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static uint16_t chksum(void);
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/*-----------------------------------------------------------------------------------*/
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#pragma optimize(push, off)
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uint16_t
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chksum(void) {
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asm("lda #0");
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asm("sta tmp1");
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asm("sta tmp1+1");
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asm("lda _chksum_ptr");
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asm("sta ptr1");
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asm("lda _chksum_ptr+1");
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asm("sta ptr1+1");
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asm("lda _chksum_len+1");
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asm("beq chksumlast");
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/* If checksum is > 256, do the first runs. */
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asm("ldy #0");
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asm("clc");
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asm("chksumloop_256:");
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asm("lda (ptr1),y");
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asm("adc tmp1");
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asm("sta tmp1");
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asm("iny");
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asm("lda (ptr1),y");
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asm("adc tmp1+1");
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asm("sta tmp1+1");
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asm("iny");
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asm("bne chksumloop_256");
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asm("inc ptr1+1");
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asm("dec _chksum_len+1");
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asm("bne chksumloop_256");
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asm("chksum_endloop_256:");
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asm("lda tmp1");
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asm("adc #0");
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asm("sta tmp1");
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asm("lda tmp1+1");
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asm("adc #0");
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asm("sta tmp1+1");
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asm("bcs chksum_endloop_256");
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asm("chksumlast:");
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asm("lda _chksum_len");
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asm("lsr");
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asm("bcc chksum_noodd");
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asm("ldy _chksum_len");
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asm("dey");
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asm("lda (ptr1),y");
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asm("clc");
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asm("adc tmp1");
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asm("sta tmp1");
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asm("bcc noinc1");
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asm("inc tmp1+1");
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asm("bne noinc1");
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asm("inc tmp1");
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asm("noinc1:");
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asm("dec _chksum_len");
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asm("chksum_noodd:");
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asm("clc");
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asm("php");
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asm("ldy _chksum_len");
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asm("chksum_loop1:");
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asm("cpy #0");
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asm("beq chksum_loop1_end");
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asm("plp");
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asm("dey");
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asm("dey");
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asm("lda (ptr1),y");
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asm("adc tmp1");
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asm("sta tmp1");
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asm("iny");
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asm("lda (ptr1),y");
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asm("adc tmp1+1");
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asm("sta tmp1+1");
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asm("dey");
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asm("php");
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asm("jmp chksum_loop1");
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asm("chksum_loop1_end:");
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asm("plp");
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asm("chksum_endloop:");
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asm("lda tmp1");
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asm("adc #0");
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asm("sta tmp1");
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asm("lda tmp1+1");
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asm("adc #0");
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asm("sta tmp1+1");
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asm("bcs chksum_endloop");
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asm("lda tmp1");
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asm("ldx tmp1+1");
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}
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#pragma optimize(pop)
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/*-----------------------------------------------------------------------------------*/
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uint16_t
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uip_chksum(uint16_t *buf, uint16_t len)
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{
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/* unsigned long sum;
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sum = 0;
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chksum_ptr = (uint16_t)buf;
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while(len >= 256) {
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chksum_len = 256;
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sum += chksum();
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len -= 256;
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chksum_ptr += 256;
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}
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if(len < 256) {
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chksum_len = len;
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sum += chksum();
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}
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while((sum >> 16) != 0) {
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sum = (sum >> 16) + (sum & 0xffff);
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}
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return sum;*/
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chksum_len = len;
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chksum_ptr = (uint16_t)buf;
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return chksum();
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}
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/*-----------------------------------------------------------------------------------*/
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uint16_t
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uip_ipchksum(void)
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{
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chksum_ptr = (uint16_t)uip_buf + UIP_LLH_LEN;
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chksum_len = UIP_IPH_LEN;
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return chksum();
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}
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/*-----------------------------------------------------------------------------------*/
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#pragma optimize(push, off)
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static uint16_t
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transport_chksum(uint8_t protocol)
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{
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chksum_protocol = protocol;
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chksum_ptr = (uint16_t)&uip_buf[UIP_LLH_LEN + UIP_IPH_LEN];
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chksum_len = UIP_TCPH_LEN;
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chksum_tmp = chksum();
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chksum_ptr = (uint16_t)uip_appdata;
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asm("lda _uip_aligned_buf+3+%b", UIP_LLH_LEN);
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asm("sec");
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asm("sbc #%b", UIP_IPTCPH_LEN);
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asm("sta _chksum_len");
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asm("lda _uip_aligned_buf+2+%b", UIP_LLH_LEN);
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asm("sbc #0");
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asm("sta _chksum_len+1");
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asm("jsr %v", chksum);
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asm("clc");
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asm("adc _chksum_tmp");
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asm("sta _chksum_tmp");
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asm("txa");
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asm("adc _chksum_tmp+1");
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asm("sta _chksum_tmp+1");
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/* Fold carry */
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/* asm("bcc noinc");
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asm("inc _chksum_tmp");
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asm("noinc:");*/
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asm("tcpchksum_loop1:");
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asm("lda _chksum_tmp");
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asm("adc #0");
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asm("sta _chksum_tmp");
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asm("lda _chksum_tmp+1");
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asm("adc #0");
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asm("sta _chksum_tmp+1");
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asm("bcs tcpchksum_loop1");
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asm("lda _uip_aligned_buf+3+%b", UIP_LLH_LEN);
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asm("sec");
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asm("sbc #%b", UIP_IPH_LEN);
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asm("sta _chksum_len");
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asm("lda _uip_aligned_buf+2+%b", UIP_LLH_LEN);
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asm("sbc #0");
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asm("sta _chksum_len+1");
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asm("ldy #$0c");
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asm("clc");
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asm("php");
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asm("tcpchksum_loop2:");
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asm("plp");
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asm("lda _uip_aligned_buf+%b,y", UIP_LLH_LEN);
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asm("adc _chksum_tmp");
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asm("sta _chksum_tmp");
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asm("iny");
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asm("lda _uip_aligned_buf+%b,y", UIP_LLH_LEN);
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asm("adc _chksum_tmp+1");
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asm("sta _chksum_tmp+1");
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asm("iny");
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asm("php");
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asm("cpy #$14");
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asm("bne tcpchksum_loop2");
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asm("plp");
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asm("lda _chksum_tmp");
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asm("adc #0");
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asm("sta _chksum_tmp");
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asm("lda _chksum_tmp+1");
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asm("adc %v", chksum_protocol);
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asm("sta _chksum_tmp+1");
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asm("lda _chksum_tmp");
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asm("adc _chksum_len+1");
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asm("sta _chksum_tmp");
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asm("lda _chksum_tmp+1");
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asm("adc _chksum_len");
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asm("sta _chksum_tmp+1");
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asm("tcpchksum_loop3:");
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asm("lda _chksum_tmp");
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asm("adc #0");
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asm("sta _chksum_tmp");
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asm("lda _chksum_tmp+1");
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asm("adc #0");
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asm("sta _chksum_tmp+1");
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asm("bcs tcpchksum_loop3");
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return chksum_tmp;
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}
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#pragma optimize(pop)
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/*-----------------------------------------------------------------------------------*/
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uint16_t
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uip_tcpchksum(void)
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{
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return transport_chksum(IP_PROTO_TCP);
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#if 0
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chksum_ptr = (uint16_t)&uip_buf[UIP_LLH_LEN + UIP_IPH_LEN];
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chksum_len = UIP_TCPH_LEN;
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chksum_tmp = chksum();
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chksum_ptr = (uint16_t)uip_appdata;
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asm("lda _uip_buf+3+%b", UIP_LLH_LEN);
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asm("sec");
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asm("sbc #%b", UIP_IPTCPH_LEN);
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asm("sta _chksum_len");
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asm("lda _uip_buf+2+%b", UIP_LLH_LEN);
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asm("sbc #0");
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asm("sta _chksum_len+1");
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asm("jsr %v", chksum);
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asm("clc");
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asm("adc _chksum_tmp");
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asm("sta _chksum_tmp");
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asm("txa");
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asm("adc _chksum_tmp+1");
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asm("sta _chksum_tmp+1");
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/* Fold carry */
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/* asm("bcc noinc");
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asm("inc _chksum_tmp");
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asm("noinc:");*/
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asm("tcpchksum_loop1:");
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asm("lda _chksum_tmp");
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asm("adc #0");
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asm("sta _chksum_tmp");
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asm("lda _chksum_tmp+1");
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asm("adc #0");
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asm("sta _chksum_tmp+1");
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asm("bcs tcpchksum_loop1");
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asm("lda _uip_buf+3+%b", UIP_LLH_LEN);
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asm("sec");
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asm("sbc #%b", UIP_IPH_LEN);
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asm("sta _chksum_len");
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asm("lda _uip_buf+2+%b", UIP_LLH_LEN);
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asm("sbc #0");
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asm("sta _chksum_len+1");
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asm("ldy #$0c");
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asm("clc");
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asm("php");
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asm("tcpchksum_loop2:");
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asm("plp");
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asm("lda _uip_buf+%b,y", UIP_LLH_LEN);
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asm("adc _chksum_tmp");
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asm("sta _chksum_tmp");
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asm("iny");
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asm("lda _uip_buf+%b,y", UIP_LLH_LEN);
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asm("adc _chksum_tmp+1");
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asm("sta _chksum_tmp+1");
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asm("iny");
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asm("php");
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asm("cpy #$14");
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asm("bne tcpchksum_loop2");
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asm("plp");
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asm("lda _chksum_tmp");
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asm("adc #0");
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asm("sta _chksum_tmp");
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asm("lda _chksum_tmp+1");
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asm("adc #6"); /* IP_PROTO_TCP */
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asm("sta _chksum_tmp+1");
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asm("lda _chksum_tmp");
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asm("adc _chksum_len+1");
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asm("sta _chksum_tmp");
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asm("lda _chksum_tmp+1");
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asm("adc _chksum_len");
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asm("sta _chksum_tmp+1");
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asm("tcpchksum_loop3:");
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asm("lda _chksum_tmp");
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asm("adc #0");
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asm("sta _chksum_tmp");
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asm("lda _chksum_tmp+1");
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asm("adc #0");
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asm("sta _chksum_tmp+1");
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asm("bcs tcpchksum_loop3");
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return chksum_tmp;
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#endif
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}
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/*-----------------------------------------------------------------------------------*/
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#if UIP_UDP_CHECKSUMS
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uint16_t
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uip_udpchksum(void)
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{
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return transport_chksum(IP_PROTO_UDP);
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#if 0
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chksum_ptr = (uint16_t)&uip_buf[20 + UIP_LLH_LEN];
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chksum_len = 20;
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chksum_tmp = chksum();
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chksum_ptr = (uint16_t)uip_appdata;
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asm("lda _uip_buf+3+%b", UIP_LLH_LEN);
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asm("sec");
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asm("sbc #40");
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asm("sta _chksum_len");
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asm("lda _uip_buf+2+%b", UIP_LLH_LEN);
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asm("sbc #0");
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asm("sta _chksum_len+1");
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asm("jsr %v", chksum);
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asm("clc");
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asm("adc _chksum_tmp");
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asm("sta _chksum_tmp");
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asm("txa");
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asm("adc _chksum_tmp+1");
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asm("sta _chksum_tmp+1");
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/* Fold carry */
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/* asm("bcc noinc");
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asm("inc _chksum_tmp");
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asm("noinc:");*/
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asm("tcpchksum_loop1:");
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asm("lda _chksum_tmp");
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asm("adc #0");
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asm("sta _chksum_tmp");
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asm("lda _chksum_tmp+1");
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asm("adc #0");
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asm("sta _chksum_tmp+1");
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asm("bcs tcpchksum_loop1");
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asm("lda _uip_buf+3+%b", UIP_LLH_LEN);
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asm("sec");
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asm("sbc #20");
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asm("sta _chksum_len");
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asm("lda _uip_buf+2+%b", UIP_LLH_LEN);
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asm("sbc #0");
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asm("sta _chksum_len+1");
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asm("ldy #$0c");
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asm("clc");
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asm("php");
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asm("tcpchksum_loop2:");
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asm("plp");
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asm("lda _uip_buf+%b,y", UIP_LLH_LEN);
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asm("adc _chksum_tmp");
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asm("sta _chksum_tmp");
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asm("iny");
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asm("lda _uip_buf+%b,y", UIP_LLH_LEN);
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asm("adc _chksum_tmp+1");
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asm("sta _chksum_tmp+1");
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asm("iny");
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asm("php");
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asm("cpy #$14");
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asm("bne tcpchksum_loop2");
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asm("plp");
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asm("lda _chksum_tmp");
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asm("adc #0");
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asm("sta _chksum_tmp");
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asm("lda _chksum_tmp+1");
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asm("adc #17"); /* IP_PROTO_UDP */
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asm("sta _chksum_tmp+1");
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asm("lda _chksum_tmp");
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asm("adc _chksum_len+1");
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asm("sta _chksum_tmp");
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asm("lda _chksum_tmp+1");
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asm("adc _chksum_len");
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asm("sta _chksum_tmp+1");
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asm("tcpchksum_loop3:");
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asm("lda _chksum_tmp");
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asm("adc #0");
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asm("sta _chksum_tmp");
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asm("lda _chksum_tmp+1");
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asm("adc #0");
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asm("sta _chksum_tmp+1");
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asm("bcs tcpchksum_loop3");
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return chksum_tmp;
|
|
#endif
|
|
}
|
|
#endif /* UIP_UDP_CHECKSUMS */
|
|
/*-----------------------------------------------------------------------------------*/
|