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/*
 *      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

Line No.	Rev	Author	Line
1	2	marcus.erl	`/*`
2			`* Copied from Linux Monitor (LiMon) - Networking.`
3			`*`
4			`* Copyright 1994 - 2000 Neil Russell.`
5			`* (See License)`
6			`* Copyright 2000 Roland Borde`
7			`* Copyright 2000 Paolo Scaffardi`
8			`* Copyright 2000, 2001 Wolfgang Denk`
9			`*/`
10
11			`/*`
12			`* General Desription:`
13			`*`
14			`* The user interface supports commands for BOOTP, RARP, and TFTP.`
15			`* Also, we support ARP internally. Depending on available data,`
16			`* these interact as follows:`
17			`*`
18			`* BOOTP:`
19			`*`
20			`* Prerequisites: - own ethernet address`
21			`* We want: - own IP address`
22			`* - TFTP server IP address`
23			`* - name of bootfile`
24			`* Next step: ARP`
25			`*`
26			`* RARP:`
27			`*`
28			`* Prerequisites: - own ethernet address`
29			`* We want: - own IP address`
30			`* - TFTP server IP address`
31			`* Next step: ARP`
32			`*`
33			`* ARP:`
34			`*`
35			`* Prerequisites: - own ethernet address`
36			`* - own IP address`
37			`* - TFTP server IP address`
38			`* We want: - TFTP server ethernet address`
39			`* Next step: TFTP`
40			`*`
41			`* DHCP:`
42			`*`
43			`* Prerequisites: - own ethernet address`
44			`* We want: - IP, Netmask, ServerIP, Gateway IP`
45			`* - bootfilename, lease time`
46			`* Next step: - TFTP`
47			`*`
48			`* TFTP:`
49			`*`
50			`* Prerequisites: - own ethernet address`
51			`* - own IP address`
52			`* - TFTP server IP address`
53			`* - TFTP server ethernet address`
54			`* - name of bootfile (if unknown, we use a default name`
55			`* derived from our own IP address)`
56			`* We want: - load the boot file`
57			`* Next step: none`
58			`*/`
59
60
61			`#include "common.h"`
62			`#include "support.h"`
63			`#include "net.h"`
64			`#include "bootp.h"`
65			`#include "tftp.h"`
66			`#include "rarp.h"`
67			`#include "arp.h"`
68			`#if OC_LAN==1`
69	140	julius	`#include "eth.h"`
70	2	marcus.erl	`#else if SMC91111_LAN==1`
71	140	julius	`#include "smc91111.h"`
72	2	marcus.erl	`#endif`
73
74			`#if 0`
75			`#define ET_DEBUG`
76			`#endif`
77
78			`/ BOOTP EXTENTIONS /`
79
80			`IPaddr_t NetOurSubnetMask=0; /* Our subnet mask (0=unknown) */`
81			`IPaddr_t NetOurGatewayIP=0; /* Our gateways IP address */`
82			`IPaddr_t NetOurDNSIP=0; /* Our DNS IP address */`
83			`char NetOurNISDomain[32]={0,}; /* Our NIS domain */`
84			`char NetOurHostName[32]={0,}; /* Our hostname */`
85			`char NetOurRootPath[64]={0,}; /* Our bootpath */`
86			`unsigned short NetBootFileSize=0; /* Our bootfile size in blocks */`
87
88			`/ END OF BOOTP EXTENTIONS /`
89
90			`unsigned long NetBootFileXferSize; /* The actual transferred size of the bootfile (in bytes) */`
91			`unsigned char NetOurEther[6]; /* Our ethernet address */`
92			`unsigned char NetServerEther[6] = /* Boot server enet address */`
93	140	julius	`{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };`
94	2	marcus.erl	`IPaddr_t NetOurIP; /* Our IP addr (0 = unknown) */`
95			`IPaddr_t NetServerIP; /* Our IP addr (0 = unknown) */`
96			`volatile unsigned char NetRxPkt; / Current receive packet */`
97			`int NetRxPktLen; /* Current rx packet length */`
98			`unsigned NetIPID; /* IP packet ID */`
99			`unsigned char NetBcastAddr[6] = /* Ethernet bcast address */`
100	140	julius	`{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };`
101	2	marcus.erl	`int NetState; /* Network loop state */`
102
103			`char BootFile[128]; /* Boot File name */`
104
105			`volatile unsigned char PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];`
106
107			`volatile unsigned char NetRxPackets[PKTBUFSRX]; / Receive packets */`
108
109			`static rxhand_f packetHandler; / Current RX packet handler */`
110			`static thand_f timeHandler; / Current timeout handler */`
111			`static unsigned long timeValue; /* Current timeout value */`
112			`volatile unsigned char NetTxPacket = 0; / THE transmit packet */`
113
114			`static int net_check_prereq (proto_t protocol);`
115
116			`/**********************************************************************/`
117			`/*`
118			`* Main network processing loop.`
119			`*/`
120			`int`
121			`NetLoop(proto_t protocol)`
122			`{`
123			`#if 1`
124	140	julius	`if (!NetTxPacket) {`
125			`int i;`
126			`printf("NetTxPacket begin setup\n");`
127			`/*`
128			`* Setup packet buffers, aligned correctly.`
129			`*/`
130			`NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);`
131			`NetTxPacket -= (unsigned long)NetTxPacket % PKTALIGN;`
132			`for (i = 0; i < PKTBUFSRX; i++) {`
133			`NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;`
134			`}`
135			`}`
136	2	marcus.erl
137	140	julius	`eth_halt();`
138			`eth_init(NetReceive);`
139	2	marcus.erl
140	140	julius	`restart:`
141	2	marcus.erl
142	140	julius	`NetCopyEther(NetOurEther, global.eth_add);`
143	2	marcus.erl
144	140	julius	`NetState = NETLOOP_CONTINUE;`
145	2	marcus.erl
146	140	julius	`/*`
147			`* Start the ball rolling with the given start function. From`
148			`* here on, this code is a state machine driven by received`
149			`* packets and timer events.`
150			`*/`
151	2	marcus.erl
152	140	julius	`if (protocol == TFTP) { /* TFTP */`
153			`NetOurIP = global.ip;`
154			`NetServerIP = global.srv_ip;`
155			`NetOurGatewayIP = global.gw_ip;`
156			`NetOurSubnetMask= global.mask;`
157	2	marcus.erl
158	140	julius	`if (net_check_prereq (protocol) != 0) {`
159			`return 0;`
160			`}`
161	2	marcus.erl
162	140	julius	`/* always use ARP to get server ethernet address */`
163			`ArpTry = 0;`
164	2	marcus.erl
165	140	julius	`ArpRequest ();`
166	2	marcus.erl
167			`#if (CONFIG_COMMANDS & CFG_CMD_DHCP)`
168	140	julius	`} else if (protocol == DHCP) {`
169			`if (net_check_prereq (protocol) != 0) {`
170			`return 0;`
171			`}`
172	2	marcus.erl
173	140	julius	`/* Start with a clean slate... */`
174			`NetOurIP = 0;`
175			`NetServerIP = 0;`
176			`DhcpRequest(); /* Basically same as BOOTP */`
177	2	marcus.erl
178			`#endif /* CFG_CMD_DHCP */`
179
180	140	julius	`} else { /* BOOTP or RARP */`
181	2	marcus.erl
182	140	julius	`/*`
183			`* initialize our IP addr to 0 in order to accept ANY`
184			`* IP addr assigned to us by the BOOTP / RARP server`
185			`*/`
186			`NetOurIP = 0;`
187			`NetServerIP = 0;`
188	2	marcus.erl
189	140	julius	`if (net_check_prereq (protocol) != 0) {`
190			`return 0;`
191			`}`
192	2	marcus.erl	`#ifdef BOOTP`
193	140	julius	`if (protocol == BOOTP) {`
194			`BootpTry = 0;`
195			`BootpRequest ();`
196			`}`
197	2	marcus.erl	`#endif`
198			`#ifdef RARP`
199			`if {`
200	140	julius	`RarpTry = 0;`
201			`RarpRequest ();`
202			`}`
203	2	marcus.erl	`#endif`
204	140	julius	`}`
205	2	marcus.erl
206	140	julius	`NetBootFileXferSize = 0;`
207	2	marcus.erl
208	140	julius	`/*`
209			`* Main packet reception loop. Loop receiving packets until`
210			* someone sets `NetQuit'.
211			`*/`
212			`for (;;) {`
213			`// WATCHDOG_RESET();`
214			`/*`
215			`* Check the ethernet for a new packet. The ethernet`
216			`* receive routine will process it.`
217			`*/`
218			`eth_rx();`
219	2	marcus.erl
220	140	julius	`/*`
221			`* Abort if ctrl-c was pressed.`
222			`*/`
223			`if (ctrlc()) {`
224			`eth_halt();`
225			`printf("\nAbort\n");`
226			`return 0;`
227			`}`
228	2	marcus.erl
229
230	140	julius	`/*`
231			`* Check for a timeout, and run the timeout handler`
232			`* if we have one.`
233			`*/`
234			`/*`
235			`if (timeHandler && (get_timer(0) > timeValue)) {`
236			`thand_f *x;`
237	2	marcus.erl
238	140	julius	`x = timeHandler;`
239			`timeHandler = (thand_f *)0;`
240			`(*x)();`
241			`}`
242			`*/`
243
244			`switch (NetState) {`
245	2	marcus.erl
246	140	julius	`case NETLOOP_RESTART:`
247			`goto restart;`
248	2	marcus.erl
249	140	julius	`case NETLOOP_SUCCESS:`
250			`if (NetBootFileXferSize > 0) {`
251			`printf("Bytes transferred = %ld (0x%lx)\n",`
252			`NetBootFileXferSize,`
253			`NetBootFileXferSize);`
254			`#ifdef TFTP_CALC_CHKSUM`
255			`printf("CHKSUM: 0x%lx\n", TFTP_CHKSUM);`
256			`#endif`
257			`}`
258			`eth_halt();`
259			`return NetBootFileXferSize;`
260	2	marcus.erl
261	140	julius	`case NETLOOP_FAIL:`
262			`return 0;`
263			`}`
264			`}`
265	2	marcus.erl	`#endif`
266			`}`
267
268			`/**********************************************************************/`
269
270
271			`#if 1`
272			`void`
273			`NetStartAgain(void)`
274			`{`
275	140	julius	`NetState = NETLOOP_RESTART;`
276	2	marcus.erl	`}`
277
278			`/**********************************************************************/`
279			`/*`
280			`* Miscelaneous bits.`
281			`*/`
282
283			`void`
284			`NetSetHandler(rxhand_f * f)`
285			`{`
286	140	julius	`packetHandler = f;`
287	2	marcus.erl	`}`
288
289
290			`void`
291			`NetSetTimeout(int iv, thand_f * f)`
292			`{`
293	140	julius	`if (iv == 0) {`
294			`timeHandler = (thand_f *)0;`
295			`} else {`
296			`timeHandler = f;`
297			`timeValue = get_timer(0) + iv;`
298			`}`
299	2	marcus.erl	`}`
300
301
302			`void`
303			`NetSendPacket(volatile unsigned char * pkt, int len)`
304			`{`
305
306			`#if OC_LAN==1`
307	140	julius	`unsigned char p = (unsigned char )0;`
308			`while (p == (unsigned char*) 0)`
309			`p = eth_get_tx_buf();`
310
311	2	marcus.erl	`memcpy(p, (void *)pkt, len);`
312			`eth_send(p, len);`
313			`#else if SMC91111_LAN==1`
314			`eth_send(pkt, len);`
315			`#endif`
316			`}`
317
318
319
320			`void`
321			`NetReceive(volatile unsigned char * pkt, int len)`
322			`{`
323	140	julius	`Ethernet_t *et;`
324			`IP_t *ip;`
325			`ARP_t *arp;`
326			`int x;`
327			`IPaddr_t ip_to_check; // Used as a temp variable to check IP`
328	2	marcus.erl
329	140	julius	`NetRxPkt = pkt;`
330			`NetRxPktLen = len;`
331			`et = (Ethernet_t *)pkt;`
332	2	marcus.erl
333	140	julius	`x = SWAP16(et->et_protlen);`
334	2	marcus.erl
335	140	julius	`if (x < 1514) {`
336			`/*`
337			`* Got a 802 packet. Check the other protocol field.`
338			`*/`
339			`x = SWAP16(et->et_prot);`
340			`ip = (IP_t *)(pkt + E802_HDR_SIZE);`
341			`len -= E802_HDR_SIZE;`
342			`} else {`
343			`ip = (IP_t *)(pkt + ETHER_HDR_SIZE);`
344			`len -= ETHER_HDR_SIZE;`
345			`}`
346	2	marcus.erl
347			`#ifdef ET_DEBUG`
348	140	julius	`printf("Receive from protocol 0x%x\n", x);`
349	2	marcus.erl	`#endif`
350
351	140	julius	`switch (x) {`
352	2	marcus.erl
353	140	julius	`case PROT_ARP:`
354			`/*`
355			`* We have to deal with two types of ARP packets:`
356			`* - REQUEST packets will be answered by sending our`
357			`* IP address - if we know it.`
358			`* - REPLY packates are expected only after we asked`
359			`* for the TFTP server's or the gateway's ethernet`
360			`* address; so if we receive such a packet, we set`
361			`* the server ethernet address`
362			`*/`
363	2	marcus.erl	`#ifdef ET_DEBUG`
364	140	julius	`printf("Got ARP\n");`
365	2	marcus.erl	`#endif`
366	140	julius	`arp = (ARP_t *)ip;`
367			`if (len < ARP_HDR_SIZE) {`
368			`printf("bad length %d < %d\n", len, ARP_HDR_SIZE);`
369			`return;`
370			`}`
371			`if (SWAP16(arp->ar_hrd) != ARP_ETHER) {`
372			`return;`
373			`}`
374			`if (SWAP16(arp->ar_pro) != PROT_IP) {`
375			`return;`
376			`}`
377			`if (arp->ar_hln != 6) {`
378			`return;`
379			`}`
380			`if (arp->ar_pln != 4) {`
381			`return;`
382			`}`
383
384			`memcpy((void) &ip_to_check, (void)&arp->ar_data[16],`
385			`sizeof(IPaddr_t));`
386			`if (NetOurIP == 0 \|\|`
387			`ip_to_check != NetOurIP) {`
388			`return;`
389			`}`
390	2	marcus.erl
391	140	julius	`switch (SWAP16(arp->ar_op)) {`
392			`case ARPOP_REQUEST: /* reply with our IP address */`
393	2	marcus.erl	`#ifdef ET_DEBUG`
394	140	julius	`printf("Got ARP REQUEST, return our IP\n");`
395	2	marcus.erl	`#endif`
396	140	julius	`NetSetEther((unsigned char *)et, et->et_src, PROT_ARP);`
397			`arp->ar_op = SWAP16(ARPOP_REPLY);`
398			`NetCopyEther(&arp->ar_data[10], &arp->ar_data[0]);`
399			`NetCopyEther(&arp->ar_data[0], NetOurEther);`
400			`//(IPaddr_t )(&arp->ar_data[16]) = (IPaddr_t )(&arp->ar_data[6]);`
401			`memcpy((void)&arp->ar_data[16],(void) &arp->ar_data[6],`
402			`sizeof(IPaddr_t));`
403			`//(IPaddr_t )(&arp->ar_data[6]) = NetOurIP;`
404			`memcpy((void)&arp->ar_data[6],(void) &NetOurIP,`
405			`sizeof(IPaddr_t));`
406
407			`NetSendPacket((unsigned char *)et,`
408			`((unsigned char *)arp-pkt)+ARP_HDR_SIZE);`
409			`return;`
410			`case ARPOP_REPLY: /* set TFTP server eth addr */`
411	2	marcus.erl	`#ifdef ET_DEBUG`
412	140	julius	`printf("Got ARP REPLY, set server/gtwy eth addr\n");`
413	2	marcus.erl	`#endif`
414	140	julius	`NetCopyEther(NetServerEther, &arp->ar_data[0]);`
415			`(packetHandler)(0,0,0,0); / start TFTP */`
416			`return;`
417			`default:`
418	2	marcus.erl	`#ifdef ET_DEBUG`
419	140	julius	`printf("Unexpected ARP opcode 0x%x\n", SWAP16(arp->ar_op));`
420	2	marcus.erl	`#endif`
421	140	julius	`return;`
422			`}`
423	2	marcus.erl
424	140	julius	`case PROT_RARP:`
425	2	marcus.erl	`#ifdef ET_DEBUG`
426	140	julius	`printf("Got RARP\n");`
427	2	marcus.erl	`#endif`
428	140	julius	`arp = (ARP_t *)ip;`
429			`if (len < ARP_HDR_SIZE) {`
430			`printf("bad length %d < %d\n", len, ARP_HDR_SIZE);`
431			`return;`
432			`}`
433	2	marcus.erl
434	140	julius	`if ((SWAP16(arp->ar_op) != RARPOP_REPLY) \|\|`
435			`(SWAP16(arp->ar_hrd) != ARP_ETHER) \|\|`
436			`(SWAP16(arp->ar_pro) != PROT_IP) \|\|`
437			`(arp->ar_hln != 6) \|\| (arp->ar_pln != 4)) {`
438	2	marcus.erl
439	140	julius	`printf("invalid RARP header\n");`
440			`} else {`
441			`//NetOurIP = ((IPaddr_t )&arp->ar_data[16]);`
442			`memcpy((void) &NetOurIP, (void) &arp->ar_data[16],`
443			`sizeof(IPaddr_t));`
444			`//NetServerIP = ((IPaddr_t )&arp->ar_data[6]);`
445			`memcpy((void) &NetServerIP,(void) &arp->ar_data[6],`
446			`sizeof(IPaddr_t));`
447	2	marcus.erl
448	140	julius	`NetCopyEther(NetServerEther, &arp->ar_data[0]);`
449	2	marcus.erl
450	140	julius	`(*packetHandler)(0,0,0,0);`
451			`}`
452			`break;`
453
454			`case PROT_IP:`
455	2	marcus.erl	`#ifdef ET_DEBUG`
456	140	julius	`printf("Got IP\n");`
457	2	marcus.erl	`#endif`
458	140	julius	`if (len < IP_HDR_SIZE) {`
459			`debug ("len bad %d < %d\n", len, IP_HDR_SIZE);`
460			`return;`
461			`}`
462			`if (len < SWAP16(ip->ip_len)) {`
463			`printf("len bad %d < %d\n", len, SWAP16(ip->ip_len));`
464			`return;`
465			`}`
466			`len = SWAP16(ip->ip_len);`
467	2	marcus.erl	`#ifdef ET_DEBUG`
468	140	julius	`printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);`
469	2	marcus.erl	`#endif`
470	140	julius	`if ((ip->ip_hl_v & 0xf0) != 0x40) {`
471			`return;`
472			`}`
473			`if (ip->ip_off & SWAP16c(0x1fff)) { /* Can't deal w/ fragments */`
474			`return;`
475			`}`
476			`if (!NetCksumOk((unsigned char *)ip, IP_HDR_SIZE_NO_UDP / 2)) {`
477			`//printf("checksum bad\n");`
478			`return;`
479			`}`
480	2	marcus.erl
481	140	julius	`memcpy((void)&ip_to_check,(void)&ip->ip_dst, sizeof (IPaddr_t));`
482	2	marcus.erl
483	140	julius	`if (NetOurIP &&`
484			`ip_to_check != NetOurIP &&`
485			`ip_to_check != 0xFFFFFFFF) {`
486			`return;`
487			`}`
488			`/*`
489			`* watch for ICMP host redirects`
490			`*`
491			`* There is no real handler code (yet). We just watch`
492			`* for ICMP host redirect messages. In case anybody`
493			`* sees these messages: please contact me`
494			`* (wd@denx.de), or - even better - send me the`
495			`* necessary fixes :-)`
496			`*`
497			`* Note: in all cases where I have seen this so far`
498			`* it was a problem with the router configuration,`
499			`* for instance when a router was configured in the`
500			`* BOOTP reply, but the TFTP server was on the same`

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