Subversion Repositories openrisc_2011-10-31

/*
 *	Copied from Linux Monitor (LiMon) - Networking.
 *
 *	Copyright 1994 - 2000 Neil Russell.
 *	(See License)
 *	Copyright 2000 Roland Borde
 *	Copyright 2000 Paolo Scaffardi
 *	Copyright 2000, 2001 Wolfgang Denk
 */
 
/*
 * General Desription:
 *
 * The user interface supports commands for BOOTP, RARP, and TFTP.
 * Also, we support ARP internally. Depending on available data,
 * these interact as follows:
 *
 * BOOTP:
 *
 *	Prerequisites:	- own ethernet address
 *	We want:	- own IP address
 *			- TFTP server IP address
 *			- name of bootfile
 *	Next step:	ARP
 *
 * RARP:
 *
 *	Prerequisites:	- own ethernet address
 *	We want:	- own IP address
 *			- TFTP server IP address
 *	Next step:	ARP
 *
 * ARP:
 *
 *	Prerequisites:	- own ethernet address
 *			- own IP address
 *			- TFTP server IP address
 *	We want:	- TFTP server ethernet address
 *	Next step:	TFTP
 *
 * DHCP:
 *
 *     Prerequisites:   - own ethernet address
 *     We want:         - IP, Netmask, ServerIP, Gateway IP
 *                      - bootfilename, lease time
 *     Next step:       - TFTP
 *
 * TFTP:
 *
 *	Prerequisites:	- own ethernet address
 *			- own IP address
 *			- TFTP server IP address
 *			- TFTP server ethernet address
 *			- name of bootfile (if unknown, we use a default name
 *			  derived from our own IP address)
 *	We want:	- load the boot file
 *	Next step:	none
 */
 
 
#include "common.h"
#include "support.h"
#include "net.h"
#include "bootp.h"
#include "tftp.h"
#include "rarp.h"
#include "arp.h"
#if OC_LAN==1
#include "eth.h"
#else if SMC91111_LAN==1
#include "smc91111.h"
#endif
 
#if 0
#define ET_DEBUG
#endif
 
/** BOOTP EXTENTIONS **/
 
IPaddr_t	NetOurSubnetMask=0;		/* Our subnet mask (0=unknown)	*/
IPaddr_t	NetOurGatewayIP=0;		/* Our gateways IP address	*/
IPaddr_t	NetOurDNSIP=0;			/* Our DNS IP address		*/
char		NetOurNISDomain[32]={0,};	/* Our NIS domain		*/
char		NetOurHostName[32]={0,};	/* Our hostname			*/
char		NetOurRootPath[64]={0,};	/* Our bootpath			*/
unsigned short		NetBootFileSize=0;		/* Our bootfile size in blocks	*/
 
/** END OF BOOTP EXTENTIONS **/
 
unsigned long		NetBootFileXferSize;	/* The actual transferred size of the bootfile (in bytes) */
unsigned char		NetOurEther[6];		/* Our ethernet address			*/
unsigned char		NetServerEther[6] =	/* Boot server enet address		*/
  { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
IPaddr_t	NetOurIP;		/* Our IP addr (0 = unknown)		*/
IPaddr_t	NetServerIP;		/* Our IP addr (0 = unknown)		*/
volatile unsigned char *NetRxPkt;		/* Current receive packet		*/
int		NetRxPktLen;		/* Current rx packet length		*/
unsigned	NetIPID;		/* IP packet ID				*/
unsigned char		NetBcastAddr[6] =	/* Ethernet bcast address		*/
  { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
int		NetState;		/* Network loop state			*/
 
char		BootFile[128];		/* Boot File name			*/
 
volatile unsigned char	PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 
volatile unsigned char *NetRxPackets[PKTBUFSRX]; /* Receive packets			*/
 
static rxhand_f *packetHandler;		/* Current RX packet handler		*/
static thand_f *timeHandler;		/* Current timeout handler		*/
static unsigned long	timeValue;		/* Current timeout value		*/
volatile unsigned char *NetTxPacket = 0;	/* THE transmit packet			*/
 
static int net_check_prereq (proto_t protocol);
 
/**********************************************************************/
/*
 *	Main network processing loop.
 */
int
NetLoop(proto_t protocol)
{
#if 1
  if (!NetTxPacket) {
    int	i;
    printf("NetTxPacket begin setup\n");
    /*
     *	Setup packet buffers, aligned correctly.
     */
    NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
    NetTxPacket -= (unsigned long)NetTxPacket % PKTALIGN;
    for (i = 0; i < PKTBUFSRX; i++) {
      NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
    }
  }
 
  eth_halt();
  eth_init(NetReceive);
 
 restart:
 
  NetCopyEther(NetOurEther, global.eth_add);
 
  NetState = NETLOOP_CONTINUE;
 
  /*
   *	Start the ball rolling with the given start function.  From
   *	here on, this code is a state machine driven by received
   *	packets and timer events.
   */
 
  if (protocol == TFTP) {			/* TFTP */
    NetOurIP	= global.ip;
    NetServerIP	= global.srv_ip;
    NetOurGatewayIP = global.gw_ip;
    NetOurSubnetMask= global.mask;
 
    if (net_check_prereq (protocol) != 0) {
      return 0;
    }
 
    /* always use ARP to get server ethernet address */
    ArpTry = 0;
 
    ArpRequest ();
 
#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
  } else if (protocol == DHCP) {
    if (net_check_prereq (protocol) != 0) {
      return 0;
    }
 
    /* Start with a clean slate... */
    NetOurIP = 0;
    NetServerIP = 0;
    DhcpRequest();		/* Basically same as BOOTP */
 
#endif	/* CFG_CMD_DHCP */
 
  } else {				/* BOOTP or RARP */
 
    /*
     * initialize our IP addr to 0 in order to accept ANY
     * IP addr assigned to us by the BOOTP / RARP server
     */
    NetOurIP = 0;
    NetServerIP = 0;
 
    if (net_check_prereq (protocol) != 0) {
      return 0;
    }
#ifdef BOOTP
    if (protocol == BOOTP) {
      BootpTry = 0;
      BootpRequest ();
    } 
#endif
#ifdef RARP
    if {
      RarpTry	 = 0;
      RarpRequest ();
    }
#endif
  }
 
  NetBootFileXferSize = 0;
 
  /*
   *	Main packet reception loop.  Loop receiving packets until
   *	someone sets `NetQuit'.
   */
  for (;;) {
    //		WATCHDOG_RESET();
    /*
     *	Check the ethernet for a new packet.  The ethernet
     *	receive routine will process it.
     */
    eth_rx();
 
    /*
     *	Abort if ctrl-c was pressed.
     */
    if (ctrlc()) {
      eth_halt();
      printf("\nAbort\n");
      return 0;
    }
 
 
    /*
     *	Check for a timeout, and run the timeout handler
     *	if we have one.
     */
    /*
      if (timeHandler && (get_timer(0) > timeValue)) {
      thand_f *x;
 
      x = timeHandler;
      timeHandler = (thand_f *)0;
      (*x)();
      }
    */
 
    switch (NetState) {
 
    case NETLOOP_RESTART:
      goto restart;
 
    case NETLOOP_SUCCESS:
      if (NetBootFileXferSize > 0) {
	printf("Bytes transferred = %ld (0x%lx)\n",
	       NetBootFileXferSize,
	       NetBootFileXferSize);
#ifdef TFTP_CALC_CHKSUM
	printf("CHKSUM: 0x%lx\n", TFTP_CHKSUM);
#endif
      }
      eth_halt();
      return NetBootFileXferSize;
 
    case NETLOOP_FAIL:
      return 0;
    }
  }
#endif
}
 
/**********************************************************************/
 
 
#if 1
void
NetStartAgain(void)
{
  NetState = NETLOOP_RESTART;
}
 
/**********************************************************************/
/*
 *	Miscelaneous bits.
 */
 
void
NetSetHandler(rxhand_f * f)
{
  packetHandler = f;
}
 
 
void
NetSetTimeout(int iv, thand_f * f)
{
  if (iv == 0) {
    timeHandler = (thand_f *)0;
  } else {
    timeHandler = f;
    timeValue = get_timer(0) + iv;
  }
}
 
 
void
NetSendPacket(volatile unsigned char * pkt, int len)
{
 
#if OC_LAN==1
  unsigned char *p = (unsigned char *)0;
  while (p == (unsigned char*) 0)
    p = eth_get_tx_buf();
 
  memcpy(p, (void *)pkt, len);
  eth_send(p, len);
#else if SMC91111_LAN==1
  eth_send(pkt, len);
#endif
}
 
 
 
void
NetReceive(volatile unsigned char * pkt, int len)
{
  Ethernet_t *et;
  IP_t	*ip;
  ARP_t	*arp;
  int	x;
  IPaddr_t ip_to_check; // Used as a temp variable to check IP
 
  NetRxPkt = pkt;
  NetRxPktLen = len;
  et = (Ethernet_t *)pkt;
 
  x = SWAP16(et->et_protlen);
 
  if (x < 1514) {
    /*
     *	Got a 802 packet.  Check the other protocol field.
     */
    x = SWAP16(et->et_prot);
    ip = (IP_t *)(pkt + E802_HDR_SIZE);
    len -= E802_HDR_SIZE;
  } else {
    ip = (IP_t *)(pkt + ETHER_HDR_SIZE);
    len -= ETHER_HDR_SIZE;
  }
 
#ifdef ET_DEBUG
  printf("Receive from protocol 0x%x\n", x);
#endif
 
  switch (x) {
 
  case PROT_ARP:
    /*
     * We have to deal with two types of ARP packets:
     * - REQUEST packets will be answered by sending  our
     *   IP address - if we know it.
     * - REPLY packates are expected only after we asked
     *   for the TFTP server's or the gateway's ethernet
     *   address; so if we receive such a packet, we set
     *   the server ethernet address
     */
#ifdef ET_DEBUG
    printf("Got ARP\n");
#endif
    arp = (ARP_t *)ip;
    if (len < ARP_HDR_SIZE) {
      printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
      return;
    }
    if (SWAP16(arp->ar_hrd) != ARP_ETHER) {
      return;
    }
    if (SWAP16(arp->ar_pro) != PROT_IP) {
      return;
    }
    if (arp->ar_hln != 6) {
      return;
    }
    if (arp->ar_pln != 4) {
      return;
    }
 
    memcpy((void*) &ip_to_check, (void*)&arp->ar_data[16],
	   sizeof(IPaddr_t));
    if (NetOurIP == 0 ||
	ip_to_check != NetOurIP) {
      return;
    }
 
    switch (SWAP16(arp->ar_op)) {
    case ARPOP_REQUEST:		/* reply with our IP address  */
#ifdef ET_DEBUG
      printf("Got ARP REQUEST, return our IP\n");
#endif
      NetSetEther((unsigned char *)et, et->et_src, PROT_ARP);
      arp->ar_op = SWAP16(ARPOP_REPLY);
      NetCopyEther(&arp->ar_data[10], &arp->ar_data[0]);
      NetCopyEther(&arp->ar_data[0], NetOurEther);
      //*(IPaddr_t *)(&arp->ar_data[16]) = *(IPaddr_t *)(&arp->ar_data[6]);
      memcpy((void*)&arp->ar_data[16],(void*) &arp->ar_data[6],
	     sizeof(IPaddr_t));
      //*(IPaddr_t *)(&arp->ar_data[6]) = NetOurIP;
      memcpy((void*)&arp->ar_data[6],(void*) &NetOurIP,
	     sizeof(IPaddr_t));
 
      NetSendPacket((unsigned char *)et,
		    ((unsigned char *)arp-pkt)+ARP_HDR_SIZE);
      return;
    case ARPOP_REPLY:		/* set TFTP server eth addr	*/
#ifdef ET_DEBUG
      printf("Got ARP REPLY, set server/gtwy eth addr\n");
#endif
      NetCopyEther(NetServerEther, &arp->ar_data[0]);
      (*packetHandler)(0,0,0,0);	/* start TFTP */
      return;
    default:
#ifdef ET_DEBUG
      printf("Unexpected ARP opcode 0x%x\n", SWAP16(arp->ar_op));
#endif
      return;
    }
 
  case PROT_RARP:
#ifdef ET_DEBUG
    printf("Got RARP\n");
#endif
    arp = (ARP_t *)ip;
    if (len < ARP_HDR_SIZE) {
      printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
      return;
    }
 
    if ((SWAP16(arp->ar_op) != RARPOP_REPLY) ||
	(SWAP16(arp->ar_hrd) != ARP_ETHER)   ||
	(SWAP16(arp->ar_pro) != PROT_IP)     ||
	(arp->ar_hln != 6) || (arp->ar_pln != 4)) {
 
      printf("invalid RARP header\n");
    } else {
      //NetOurIP = *((IPaddr_t *)&arp->ar_data[16]);
      memcpy((void*) &NetOurIP, (void*) &arp->ar_data[16],
	     sizeof(IPaddr_t));
      //NetServerIP = *((IPaddr_t *)&arp->ar_data[6]);
      memcpy((void*) &NetServerIP,(void*) &arp->ar_data[6],
	     sizeof(IPaddr_t));
 
      NetCopyEther(NetServerEther, &arp->ar_data[0]);
 
      (*packetHandler)(0,0,0,0);
    }
    break;
 
  case PROT_IP:
#ifdef ET_DEBUG
    printf("Got IP\n");
#endif
    if (len < IP_HDR_SIZE) {
      debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
      return;
    }
    if (len < SWAP16(ip->ip_len)) {
      printf("len bad %d < %d\n", len, SWAP16(ip->ip_len));
      return;
    }
    len = SWAP16(ip->ip_len);
#ifdef ET_DEBUG
    printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
#endif
    if ((ip->ip_hl_v & 0xf0) != 0x40) {
      return;
    }
    if (ip->ip_off & SWAP16c(0x1fff)) { /* Can't deal w/ fragments */
      return;
    }
    if (!NetCksumOk((unsigned char *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
      //printf("checksum bad\n");
      return;
    }
 
    memcpy((void*)&ip_to_check,(void*)&ip->ip_dst, sizeof (IPaddr_t));
 
    if (NetOurIP &&
	ip_to_check != NetOurIP &&
	ip_to_check != 0xFFFFFFFF) {
      return;
    }
    /*
     * watch for ICMP host redirects
     *
     * There is no real handler code (yet). We just watch
     * for ICMP host redirect messages. In case anybody
     * sees these messages: please contact me
     * (wd@denx.de), or - even better - send me the
     * necessary fixes :-)
     *
     * Note: in all cases where I have seen this so far
     * it was a problem with the router configuration,
     * for instance when a router was configured in the
     * BOOTP reply, but the TFTP server was on the same
     * subnet. So this is probably a warning that your
     * configuration might be wrong. But I'm not really
     * sure if there aren't any other situations.
     */
    if (ip->ip_p == IPPROTO_ICMP) {
      ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
 
      if (icmph->type != ICMP_REDIRECT)
	return;
      if (icmph->code != ICMP_REDIR_HOST)
	return;
      printf (" ICMP Host Redirect to ");
      print_IPaddr(icmph->un.gateway);
      putc(' ');
    } else if (ip->ip_p != IPPROTO_UDP) {	/* Only UDP packets */
      return;
    }
 
    /*
     *	IP header OK.  Pass the packet to the current handler.
     */
    (*packetHandler)((unsigned char *)ip +IP_HDR_SIZE,
		     SWAP16(ip->udp_dst),
		     SWAP16(ip->udp_src),
		     SWAP16(ip->udp_len) - 8);
 
    break;
  }
}
 
 
/**********************************************************************/
 
static int net_check_prereq (proto_t protocol)
{
  switch (protocol) {
  case ARP:	/* nothing to do */
    break;
 
  case TFTP:
    if (NetServerIP == 0) {
      printf	 ("*** ERROR: `serverip' not set\n");
      return (1);
    }
 
    if (NetOurIP == 0) {
      printf ("*** ERROR: `ipaddr' not set\n");
      return (1);
    }
    /* Fall through */
 
  case DHCP:
  case RARP:
  case BOOTP:
    if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
      printf ("*** ERROR: `ethaddr' not set\n");
      return (1);
    }
    /* Fall through */
  }
  return (0);	/* OK */
}
/**********************************************************************/
 
int
NetCksumOk(unsigned char * ptr, int len)
{
  return !((NetCksum(ptr, len) + 1) & 0xfffe);
}
 
 
unsigned
NetCksum(unsigned char * ptr, int len)
{
  unsigned long	xsum;
 
  xsum = 0;
  while (len-- > 0)
    {
      xsum += (*((unsigned short *)ptr));
      ptr += sizeof(short);
    }
 
  xsum = (xsum & 0xffff) + (xsum >> 16);
  xsum = (xsum & 0xffff) + (xsum >> 16);
  return (xsum & 0xffff);
}
 
 
void
NetCopyEther(volatile unsigned char * to, unsigned char * from)
{
  int	i;
 
  for (i = 0; i < 6; i++)
    *to++ = *from++;
}
 
 
void
NetSetEther(volatile unsigned char * xet, unsigned char * addr, unsigned long prot)
{
  volatile Ethernet_t *et = (Ethernet_t *)xet;
 
  NetCopyEther(et->et_dest, addr);
  NetCopyEther(et->et_src, NetOurEther);
  et->et_protlen = SWAP16(prot);
}
 
 
void
NetSetIP(volatile unsigned char * xip, IPaddr_t dest, int dport, int sport, int len)
{
  volatile IP_t *ip = (IP_t *)xip;
 
  /*
   *	If the data is an odd number of bytes, zero the
   *	byte after the last byte so that the checksum
   *	will work.
   */
  if (len & 1)
    xip[IP_HDR_SIZE + len] = 0;
 
  /*
   *	Construct an IP and UDP header.
   (need to set no fragment bit - XXX)
  */
  ip->ip_hl_v  = 0x45;		/* IP_HDR_SIZE / 4 (not including UDP) */
  ip->ip_tos   = 0;
  ip->ip_len   = SWAP16(IP_HDR_SIZE + len);
  ip->ip_id    = SWAP16(NetIPID++);
  ip->ip_off   = SWAP16c(0x4000);	/* No fragmentation */
  ip->ip_ttl   = 255;
  ip->ip_p     = 17;		/* UDP */
  ip->ip_sum   = 0;
  //ip->ip_src   = NetOurIP;
  memcpy((void*)&ip->ip_src,(void*) &NetOurIP,
	sizeof(IPaddr_t));  
  //ip->ip_dst   = dest;
  memcpy((void*)&ip->ip_dst,(void*) &dest,
	sizeof(IPaddr_t));
  ip->udp_src  = SWAP16(sport);
  ip->udp_dst  = SWAP16(dport);
  ip->udp_len  = SWAP16(8 + len);
  ip->udp_xsum = 0;
  ip->ip_sum   = ~NetCksum((unsigned char *)ip, IP_HDR_SIZE_NO_UDP / 2);
}
 
void copy_filename (unsigned char *dst, unsigned char *src, int size)
{
  if (*src && (*src == '"')) {
    ++src;
    --size;
  }
 
  while ((--size > 0) && *src && (*src != '"')) {
    *dst++ = *src++;
  }
  *dst = '\0';
}
 
void ip_to_string (IPaddr_t x, char *s)
{
  char num[] = "0123456789ABCDEF";
  int i;
 
  x = SWAP32(x);
 
  for(i = 28; i >= 0; i -= 4)
    *s++ = num[((x >> i) & 0x0f)];
  *s = 0;
}
 
void print_IPaddr (IPaddr_t x)
{
  char tmp[12];
 
  ip_to_string(x, tmp);
 
  printf(tmp);
}
 
static unsigned int i2a(char* dest,unsigned int x) {
  register unsigned int tmp=x;
  register unsigned int len=0;
  if (x>=100) { *dest++=tmp/100+'0'; tmp=tmp%100; ++len; }
  if (x>=10) { *dest++=tmp/10+'0'; tmp=tmp%10; ++len; }
  *dest++=tmp+'0';
  return len+1;
}
 
char *inet_ntoa(unsigned long in) {
  static char buf[20];
  unsigned int len;
  unsigned char *ip=(unsigned char*)&in;
 
  len=i2a(buf,ip[0]); buf[len]='.'; ++len;
  len+=i2a(buf+ len,ip[1]); buf[len]='.'; ++len;
  len+=i2a(buf+ len,ip[2]); buf[len]='.'; ++len;
  len+=i2a(buf+ len,ip[3]); buf[len]=0;
  return buf;
}
 
unsigned long inet_aton(const char *cp)
{
  unsigned long a[4];
  unsigned long ret;
  char *p = (char *)cp;
  int i,d;
  if (strcmp(cp, "255.255.255.255") == 0)
    return -1;
 
  for(i = 0; i < 4; i++) {
    a[i] = strtoul(p, 0, 0);
    for(d=1; (p[d] != '.') && (i < 3); d++);
    p = &p[d+1];
  }
 
  ret = (a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]; 
  return ret;
}
 
#endif