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117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
/*
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* tcp.c
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*
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* Created on: 29.09.2011
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* Author: Oliver
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*/
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#include <stdio.h>
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#include <thread.h>
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#include <string.h>
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#include "tcp.h"
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#include "in.h"
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#include "socket.h"
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#include "sys/net/net_help/net_help.h"
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void printArrayRange_tcp(uint8_t *udp_header, uint16_t len)
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{
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int i = 0;
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printf("-------------MEMORY-------------\n");
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for (i = 0; i < len; i++)
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{
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printf("%#x ", *(udp_header+i));
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}
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printf("-------------MEMORY-------------\n");
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}
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uint16_t tcp_csum(ipv6_hdr_t *ipv6_header, tcp_hdr_t *tcp_header){
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uint16_t sum;
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uint16_t len = ipv6_header->length;
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sum = len + IPPROTO_TCP;
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sum = csum(sum, (uint8_t *)&ipv6_header->srcaddr, 2 * sizeof(ipv6_addr_t));
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sum = csum(sum, (uint8_t*)tcp_header, len);
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return (sum == 0) ? 0xffff : HTONS(sum);
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}
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void tcp_packet_handler (void)
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{
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msg_t m_recv_ip, m_send_ip, m_recv_tcp, m_send_tcp;
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struct ipv6_hdr_t *ipv6_header;
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struct tcp_hdr_t *tcp_header;
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uint8_t *payload;
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socket_internal_t *tcp_socket = NULL;
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uint16_t chksum;
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while (1)
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{
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msg_receive(&m_recv_ip);
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ipv6_header = ((struct ipv6_hdr_t*)&buffer);
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tcp_header = ((struct tcp_hdr_t*)(&buffer[IPV6_HDR_LEN]));
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payload = &buffer[IPV6_HDR_LEN+TCP_HDR_LEN];
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chksum = tcp_csum(ipv6_header, tcp_header);
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printf("Checksum is %x!\n", chksum);
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tcp_socket = get_tcp_socket(tcp_header->dst_port);
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if ((chksum != 0xffff) && (tcp_socket != NULL))
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{
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uint8_t tcp_flags = tcp_header->reserved_flags;
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//TODO: URG Flag and PSH flag are currently being ignored
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if (IS_TCP_ACK(tcp_flags))
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{
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// only ACK Bit set
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}
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else if (IS_TCP_RST(tcp_flags))
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{
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// only RST Bit set
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}
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else if (IS_TCP_SYN(tcp_flags))
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{
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// only SYN Bit set, request new queued socket
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socket_t *new_socket = new_tcp_queued_socket(ipv6_header, tcp_header, tcp_socket);
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if (new_socket != NULL)
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{
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// notify socket function accept(..) that a new connection request has arrived
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m_send_tcp.content.ptr = (char*)buffer;
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m_send_tcp.content.value = IPV6_HDR_LEN + ipv6_header->length;
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msg_send(&m_send_tcp, tcp_socket->pid, 0);
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}
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else
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{
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printf("Dropped TCP Message because an error occured while requesting a new queued socket!\n");
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}
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}
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else if (IS_TCP_SYN_ACK(tcp_flags))
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{
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// only SYN and ACK Bit set
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}
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else if (IS_TCP_FIN(tcp_flags))
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{
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// only FIN Bit set
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}
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else if (IS_TCP_FIN_ACK(tcp_flags))
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{
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// only FIN and ACK Bit set
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}
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else
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{
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// TODO: any other case
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}
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}
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else
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{
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printf("Wrong checksum (%x) or no corresponding socket found!\n", chksum);
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}
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tcp_socket = NULL;
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msg_reply(&m_recv_ip, &m_send_ip);
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}
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}
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