uint8_t handle_ethernet_packet()
{
uint16_t packet_size = 0;
packet_size = Enc28j60PacketReceive(sizeof(ethernet_buffer), ethernet_buffer);
if (packet_size == 0){
return 0;
}
// char buffer[30];
// sprintf(buffer, "ETH packet length: %" PRIu16, packet_size);
// DBG_DYNAMIC(buffer);
struct ethernet_header * header = (struct ethernet_header*)ethernet_buffer;
packet_size -=sizeof(*header);
uint8_t* data = (uint8_t*)(header +1);
uint8_t ret=1;
switch(header->type)
{
case HTON16(ETHERNET_TYPE_IP):
//DBG_STATIC("Recieved IP packet.");
//IP handle packet
ret = ip_handle_packet((struct ip_header*)data,packet_size,(const ethernet_address*)&header->src);
break;
case HTON16(ETHERNET_TYPE_ARP):
//DBG_STATIC("Recieved ARP packet.");
//ARP handle packet
ret = arp_handle_packet((struct arp_header*)data,packet_size);
// if(ret){
// DBG_STATIC("ARP packet successfully handled.");
// } else {
// DBG_STATIC("ARP packet FAILURE.")
// }
break;
default:
return 0;
}
ethernet_stats.rx_packets++;
return ret;
}
void LanTask (void)
{
uint16_t plen, dat_p = 0;
bool send;
while (1)
{
plen = Enc28j60PacketReceive(BUFFER_SIZE, buf);
/*plen will unequal to zero if there is a valid packet (without crc error) */
if (plen == 0) return;
// arp is broadcast if unknown but a host may also verify the mac address by sending it to a unicast address.
if (Eth_type_is_arp_and_my_ip(buf, plen))
{
Make_arp_answer_from_request(buf);
continue;
}
// check if the ip packet is for us:
if (Eth_type_is_ip_and_my_ip(buf, plen) == 0)
{
continue;
}
// ping
if((buf[IP_PROTO_P] == IP_PROTO_ICMP_V) && (buf[ICMP_TYPE_P] == ICMP_TYPE_ECHOREQUEST_V))
{
Make_echo_reply_from_request(buf, plen);
continue;
}
// tcp port www start, compare only the lower byte
if ((buf[IP_PROTO_P] == IP_PROTO_TCP_V) && (buf[TCP_DST_PORT_H_P] == 0) && (buf[TCP_DST_PORT_L_P] == mywwwport))
{
if (buf[TCP_FLAGS_P] & TCP_FLAGS_SYN_V)
{
Make_tcp_synack_from_syn(buf); // make_tcp_synack_from_syn does already send the syn,ack
continue;
}
if (buf[TCP_FLAGS_P] & TCP_FLAGS_ACK_V)
{
Init_len_info(buf); // init some data structures
dat_p = Get_tcp_data_pointer();
if (dat_p == 0)
{
// we can possibly have no data, just ack:
if (buf[TCP_FLAGS_P] & TCP_FLAGS_FIN_V)
{
Make_tcp_ack_from_any(buf);
}
continue;
}
}
send = false;
if (strncmp("GET ",(char *) & (buf[dat_p]), 4) != 0)
{
// head, post and other methods for possible status codes see:
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
plen = Fill_tcp_data_p(buf, 0, PSTR("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n<h1>200 OK</h1>"));
send = true;
}
if (!send)
{
char *p;
p = (char*) &(buf[dat_p+4]); // start of incomming payload
switch (GetCommand(p))
{
case 0:
break;
case 1:
countUp0 = false;
break;
case 2:
countUp0 = true;
break;
}
plen = PrintWebpage(buf);
send = true;
}
Make_tcp_ack_from_any(buf); // send ack for http get
Make_tcp_ack_with_data(buf, plen); // send data
continue;
}
// udp interface:
if (buf[IP_PROTO_P]==IP_PROTO_UDP_V)
{
uint8_t payloadlen=buf[UDP_LEN_L_P]-UDP_HEADER_LEN;
// the received command has to start with t and be 4 char long
// e.g "test\0"
if(payloadlen)
{
char msg1[]="Hello";
Make_udp_reply_from_request(buf,msg1,sizeof(msg1),MYUDPPORT);
}
}// End udp interface.
}// End while(1)
}// End LanTask