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https://github.com/RIOT-OS/RIOT.git
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66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
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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 "udp.h"
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#include "msg.h"
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#include "sys/net/sixlowpan/sixlowip.h"
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#include "sys/net/sixlowpan/sixlowpan.h"
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#include "socket.h"
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#include "in.h"
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#include "sys/net/net_help/net_help.h"
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#include "sys/net/net_help/msg_help.h"
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uint16_t udp_csum(ipv6_hdr_t *ipv6_header, udp_hdr_t *udp_header)
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{
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uint16_t sum;
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uint16_t len = udp_header->length;
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sum = len + IPPROTO_UDP;
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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*)udp_header, len);
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return (sum == 0) ? 0xffff : HTONS(sum);
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}
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void udp_packet_handler(void)
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{
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msg_t m_recv_ip, m_send_ip, m_recv_udp, m_send_udp;
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ipv6_hdr_t *ipv6_header;
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udp_hdr_t *udp_header;
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uint8_t *payload;
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socket_internal_t *udp_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 = ((ipv6_hdr_t*)m_recv_ip.content.ptr);
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udp_header = ((udp_hdr_t*)(m_recv_ip.content.ptr + IPV6_HDR_LEN));
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payload = (uint8_t*)(m_recv_ip.content.ptr + IPV6_HDR_LEN + UDP_HDR_LEN);
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chksum = udp_csum(ipv6_header, udp_header);
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if (chksum == 0xffff)
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{
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udp_socket = get_udp_socket(ipv6_header, udp_header);
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if (udp_socket != NULL)
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{
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m_send_udp.content.ptr = (char*)ipv6_header;
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msg_send_receive(&m_send_udp, &m_recv_udp, udp_socket->recv_pid);
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}
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else
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{
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printf("Dropped UDP Message because no process ID was found for delivery!\n");
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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)!\n", chksum);
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}
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msg_reply(&m_recv_ip, &m_send_ip);
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}
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}
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