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////////////////////////////////////////////////////////////////////////////////
//
// Filename: manping.cpp
//
// Project: OpenArty, an entirely open SoC based upon the Arty platform
//
// Purpose: To command the network to ping a target.
//
//
// Creator: Dan Gisselquist, Ph.D.
// Gisselquist Technology, LLC
//
////////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2015-2017, Gisselquist Technology, LLC
//
// This program is free software (firmware): you can redistribute it and/or
// modify it under the terms of the GNU General Public License as published
// by the Free Software Foundation, either version 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. (It's in the $(ROOT)/doc directory. Run make with no
// target there if the PDF file isn't present.) If not, see
// <http://www.gnu.org/licenses/> for a copy.
//
// License: GPL, v3, as defined and found on www.gnu.org,
// http://www.gnu.org/licenses/gpl.html
//
//
////////////////////////////////////////////////////////////////////////////////
//
//
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <strings.h>
#include <ctype.h>
#include <string.h>
#include <signal.h>
#include <assert.h>
#include "port.h"
#include "regdefs.h"
#define TXGO 0x04000
#define NOHWCRC 0x08000
#define NOHWMAC 0x10000
#define NETRESET 0x20000
//
// Define DONT_INVERT for debugging only, as it will break the interface
// test
//
// #define DONT_INVERT
FPGA *m_fpga;
void closeup(int v) {
m_fpga->kill();
exit(0);
}
void usage(void) {
printf("USAGE: manping EN:RX:xx:xx:xx:xx AR:TY:EN:TX:xx:xx de.st.ip.x ar.ty.ip.x\n");
}
bool strtoenetaddr(char *s, unsigned char *addr) {
char *p, *c;
p = s;
addr[0] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
c = strchr(p,':');
if((!c) || ((c-p)>=3))
return false;
p = c+1;
addr[1] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
c = strchr(p,':');
if((!c) || ((c-p)>=3))
return false;
p = c+1;
addr[2] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
c = strchr(p,':');
if((!c) || ((c-p)>=3))
return false;
p = c+1;
addr[3] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
c = strchr(p,':');
if((!c) || ((c-p)>=3))
return false;
p = c+1;
addr[4] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
c = strchr(p,':');
if((!c) || ((c-p)>=3))
return false;
p = c+1;
addr[5] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
return true;
}
bool strtoinetaddr(char *s, unsigned char *addr) {
char *p, *c;
p = s;
addr[0] = (unsigned char)(strtoul(p, NULL, 10)&0x0ff);
c = strchr(p,'.');
if((!c) || ((c-p)>3))
return false;
p = c+1;
addr[1] = (unsigned char)(strtoul(p, NULL, 10)&0x0ff);
c = strchr(p,'.');
if((!c) || ((c-p)>3))
return false;
p = c+1;
addr[2] = (unsigned char)(strtoul(p, NULL, 10)&0x0ff);
c = strchr(p,'.');
if((!c) || ((c-p)>3))
return false;
p = c+1;
addr[3] = (unsigned char)(strtoul(p, NULL, 10)&0x0ff);
return true;
}
unsigned calccrc(const int bytelen, const unsigned *buf) {
const unsigned int taps = 0xedb88320u;
#ifdef DONT_INVERT
unsigned int crc = 0;
#else
unsigned int crc = 0xffffffff; // initial value
#endif
int bidx;
int bp = 0;
for(bidx = 0; bidx<bytelen; bidx++) {
if (bidx == 14)
bidx+=2;
unsigned char byte = buf[(bidx>>2)]>>(24-((bidx&3)<<3));
// printf("CRC[%2d]: %02x ([%2d]0x%08x)\n", bidx, byte, (bidx>>2), buf[(bidx>>2)]);
for(int bit=8; --bit>= 0; byte >>= 1) {
if ((crc ^ byte) & 1) {
crc >>= 1;
crc ^= taps;
} else
crc >>= 1;
} bp++;
}
#ifndef DONT_INVERT
crc ^= 0xffffffff;
#endif
// Now, we need to reverse these bytes
// ABCD
unsigned a,b,c,d;
a = (crc>>24); // &0x0ff;
b = (crc>>16)&0x0ff;
c = (crc>> 8)&0x0ff;
d = crc; // (crc )&0x0ff;
crc = (d<<24)|(c<<16)|(b<<8)|a;
// printf("%d bytes processed\n", bp);
return crc;
}
void ipchecksum(unsigned *packet) {
int npkt = (packet[0]>>24)&0x0f;
unsigned checksum = 0;
packet[2] &= 0xffff0000;
printf("PKT[2] set to %08x\n", packet[2]);
printf("checksum = %08x\n", checksum);
for(int i=0; i<npkt; i++)
checksum += packet[i] & 0x0ffff;
printf("checksum = %08x\n", checksum);
for(int i=0; i<npkt; i++)
checksum += (packet[i]>>16)&0x0ffff;
printf("checksum = %08x\n", checksum);
checksum = (checksum & 0x0ffff) + (checksum >> 16);
checksum = (checksum & 0x0ffff) + (checksum >> 16);
packet[2] |= (checksum & 0x0ffff)^0x0ffff;
printf("PKT[2] set to 0x%08x\n", packet[2]);
checksum = 0;
for(int i=0; i<npkt; i++)
checksum += packet[i] & 0x0ffff;
for(int i=0; i<npkt; i++)
checksum += (packet[i]>>16)&0x0ffff;
checksum = (checksum & 0x0ffff) + (checksum >> 16);
checksum = (checksum & 0x0ffff) + (checksum >> 16);
checksum ^= 0x0ffff;
assert(checksum == 0);
}
void clear_scope(FPGA *fpga) {
unsigned scopev;
scopev = m_fpga->readio(R_NETSCOPE);
int delay = (scopev>>20)&0x0f;
delay = (1<<(delay))-32;
m_fpga->writeio(R_NETSCOPE, (delay));
}
int main(int argc, char **argv) {
bool config_hw_mac = true, config_hw_crc = true;
FPGA::BUSW txstat;
int argn;
unsigned checksum;
unsigned urand[16], nu = 0;
{
FILE *fp;
for(int i=0; i<16; i++)
urand[i] = rand();
// Now, see if we can do better than the library random
// number generator--but don't fail if we can't.
fp = fopen("/dev/urandom", "r");
if (fp != NULL) {
int nr = fread(urand, sizeof(short), 16, fp);
fclose(fp);
if (nr<0)
printf("Could not generate random numbers from /dev/urandom!\nTest may not be valid.\n");
}
}
FPGAOPEN(m_fpga);
signal(SIGSTOP, closeup);
signal(SIGHUP, closeup);
txstat = m_fpga->readio(R_NET_TXCMD);
// Take the ethernet out of reset
if ((txstat & NETRESET) != 0)
m_fpga->writeio(R_NET_TXCMD, (txstat &=(~NETRESET)));
unsigned packet[14];
unsigned char smac[6], dmac[6];
unsigned char sip[4], dip[4];
// I know the ethernet MAC of the computer I wish to test with
dmac[0] = 0xc8; dmac[1] = 0x3a; dmac[2] = 0x35;
dmac[3] = 0xd2; dmac[4] = 0x07; dmac[5] = 0xb1;
// And just something from /dev/urandom to create our source address
smac[0] = 0xd2; smac[1] = 0xd8; smac[2] = 0x28;
smac[3] = 0xe8; smac[4] = 0xb0; smac[5] = 0x96;
// Similarly with the destination IP of the computer I wish to test with
dip[0] = 192; dip[1] = 168; dip[2] = 10; dip[3] = 1;
// and let's pick a source IP just ... somewhere on that network
sip[0] = 192; sip[1] = 168; sip[2] = 10; sip[3] = 22;
clear_scope(m_fpga);
argn = 1;
{
bool bad_address = false;
char *badp = NULL;
if ((argn<argc)&&(strchr(argv[argn], ':'))) {
if (!strtoenetaddr(argv[argn++], dmac)) {
badp = argv[argn-1];
bad_address = true;
} else if ((argn<argc)&&(strchr(argv[argn], ':'))) {
if (!strtoenetaddr(argv[argn++], smac)) {
badp = argv[argn-1];
bad_address = true;
}
}
} if ((argn<argc)&&(!bad_address)&&(strchr(argv[argn], '.'))) {
if (!strtoinetaddr(argv[argn++], dip)) {
badp = argv[argn-1];
bad_address = true;
} else if ((argn<argc)&&(strchr(argv[argn], '.'))) {
if (!strtoinetaddr(argv[argn++], sip)) {
badp = argv[argn-1];
bad_address = true;
}
}
}
if (bad_address) {
usage();
fprintf(stderr, "ERR: could not comprehend address, %s\n", badp);
exit(EXIT_FAILURE);
}
}
printf("Building packet\n");
printf("From %3d.%3d.%3d.%3d [%02x:%02x:%02x:%02x:%02x:%02x]\n",
sip[0], sip[1], sip[2], sip[3],
smac[0], smac[1], smac[2], smac[3], smac[4], smac[5]);
printf("To %3d.%3d.%3d.%3d [%02x:%02x:%02x:%02x:%02x:%02x]\n",
dip[0], dip[1], dip[2], dip[3],
dmac[0], dmac[1], dmac[2], dmac[3], dmac[4], dmac[5]);
// Let's build ourselves a ping packet
packet[ 0] = (dmac[0]<<24)|(dmac[1]<<16)|(dmac[2]<<8)|(dmac[3]);
packet[ 1] = (dmac[4]<<24)|(dmac[5]<<16)|(smac[0]<<8)|(smac[1]);
packet[ 2] = (smac[2]<<24)|(smac[3]<<16)|(smac[4]<<8)|(smac[5]);
packet[ 3] = 0x08000800;
packet[ 4] = 0x4500001c; // IPv4, 20byte header, type of service = 0
packet[ 5] = (urand[nu++]&0xffff0000); // Packet ID
packet[ 6] = 0x80010000; // no flags, fragment offset=0, ttl=0, proto=1
packet[ 7] = (sip[0]<<24)|(sip[1]<<16)|(sip[2]<<8)|(sip[3]);
packet[ 8] = (dip[0]<<24)|(dip[1]<<16)|(dip[2]<<8)|(dip[3]);
// Ping payload: type = 0x08 (PING, the response will be zero)
// CODE = 0
// Checksum will be filled in later
packet[ 9] = 0x08000000;
// This is the PING identifier and sequence number. For now, we'll
// just feed it random information--doesn't really matter what
packet[10] = urand[nu++];
// Now, the minimum ethernet packet is 16 words. So, let's flush
// ourselves out to that minimum length.
packet[11] = 0;
packet[12] = 0;
packet[13] = 0;
packet[14] = 0;
// Calculate the IP header checksum
ipchecksum(&packet[4]);
// Calculate the PING payload checksum
checksum = packet[ 9] & 0x0ffff;
checksum += (packet[ 9]>>16)&0x0ffff;
checksum += packet[10] & 0x0ffff;
checksum += (packet[10]>>16)&0x0ffff;
checksum = ((checksum >> 16)&0x0ffff) + (checksum & 0x0ffff);
checksum = ((checksum >> 16)&0x0ffff) + (checksum & 0x0ffff);
packet[ 9] = ((packet[9] & 0xffff0000)|(checksum))^0x0ffff;
// Calculate the CRC--assuming we'll use it.
packet[15] = calccrc(15*4, packet);
// Clear any/all pending receiving errors or packets
m_fpga->writeio(R_NET_RXCMD, 0x0fffff);
if (config_hw_mac) {
int ln;
m_fpga->writeio(R_NET_MACHI, (smac[0]<<8)|(smac[1]));
m_fpga->writeio(R_NET_MACLO, (smac[2]<<24)|(smac[3]<<16)|(smac[4]<<8)|(smac[5]));
// Now, let's rebuild our packet for the non-hw-mac option,
// now that we know the CRC. In general, we're just going
// to copy the packet we created earlier, but we need to
// shift things as we do so.
packet[ 0] = (dmac[0]<<24)|(dmac[1]<<16)|(dmac[2]<<8)|(dmac[3]);
packet[ 1] = (dmac[4]<<24)|(dmac[5]<<16)|0x0800;
packet[ 2] = packet[ 4];
packet[ 3] = packet[ 5];
packet[ 4] = packet[ 6];
packet[ 5] = packet[ 7];
packet[ 6] = packet[ 8];
packet[ 7] = packet[ 9];
packet[ 8] = packet[10];
packet[ 9] = packet[11];
packet[10] = packet[12];
packet[11] = packet[13];
packet[12] = packet[14];
packet[13] = packet[15];
ln = (config_hw_crc)?9:14;
printf("Packet:\n");
for(int i=0; i<14; i++)
printf("\t%2d: 0x%08x\n", i, packet[i]);
// Load the packet into the hardware buffer
m_fpga->writei(R_NET_TXBUF, ln, packet);
// And give it the transmit command.
{ unsigned cmd;
cmd = TXGO|(ln<<2)|((config_hw_crc)?0:NOHWCRC);
m_fpga->writeio(R_NET_TXCMD, cmd);
printf("Sent TX command: 0x%x\n", cmd);
}
} else {
int ln;
ln = (config_hw_crc)?11:12;
printf("Packet:\n");
for(int i=0; i<15; i++)
printf("\t%3d: 0x%08x\n", i, packet[i]);
printf("\tCRC: 0x%08x\n", packet[15]);
// Load the packet into the hardware buffer
m_fpga->writei(R_NET_TXBUF, ln, packet);
// And give it the transmit command
m_fpga->writeio(R_NET_TXCMD, TXGO|NOHWMAC|(ln<<2)|((config_hw_crc)?0:NOHWCRC));
}
// First, we need to look for any ARP requests, and we'll need to
// respond to them. If during this time we get a ping response
// packet, we're done.
printf("\nLooking for a response ...\n");
unsigned rxstat;
int errcount = 0;
do {
rxstat = m_fpga->readio(R_NET_RXCMD);
if (rxstat & 0x04000) {
int rxlen;
unsigned *buf;
printf("RX Status = %08x\n", rxstat);
rxlen = ((rxstat & 0x03fff)+3)>>2;
buf = new unsigned[rxlen];
m_fpga->readi(R_NET_RXBUF, rxlen, buf);
for(int i=0; i<rxlen; i++)
printf("\tRX[%2d]: 0x%08x\n", i, buf[i]);
delete[] buf;
// m_fpga->writeio(R_NET_RXCMD, 0xffffff);
break;
}
} while(((rxstat & 0x04000)==0)&&(errcount++ < 500));
rxstat = m_fpga->readio(R_NET_RXCMD);
printf("Final Rx Status = %08x\n", rxstat);
delete m_fpga;
}
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