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wdenk 2002-10-31 22:12:35 +00:00
parent fef08ee805
commit 2d966958cd
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358
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/*
* LiMon Monitor (LiMon) - Network.
*
* Copyright 1994 - 2000 Neil Russell.
* (See License)
*
*
* History
* 9/16/00 bor adapted to TQM823L/STK8xxL board, RARP/TFTP boot added
*/
#ifndef __NET_H__
#define __NET_H__
#if !defined(CONFIG_NET_MULTI) && defined(CONFIG_8xx)
#include <commproc.h>
#if defined(FEC_ENET) || defined(SCC_ENET)
#define CONFIG_NET_MULTI
#endif
#endif
#include <asm/byteorder.h> /* for nton* / ntoh* stuff */
/*
* The number of receive packet buffers, and the required packet buffer
* alignment in memory.
*
*/
#define PKTBUFSRX 4
#define PKTALIGN 32
typedef ulong IPaddr_t;
/*
* The current receive packet handler. Called with a pointer to the
* application packet, and a protocol type (PORT_BOOTPC or PORT_TFTP).
* All other packets are dealt with without calling the handler.
*/
typedef void rxhand_f(uchar *, unsigned, unsigned, unsigned);
/*
* A timeout handler. Called after time interval has expired.
*/
typedef void thand_f(void);
#ifdef CONFIG_NET_MULTI
#define NAMESIZE 16
enum eth_state_t {
ETH_STATE_INIT,
ETH_STATE_PASSIVE,
ETH_STATE_ACTIVE
};
struct eth_device {
char name[NAMESIZE];
unsigned char enetaddr[6];
int iobase;
int state;
int (*init) (struct eth_device*, bd_t*);
int (*send) (struct eth_device*, volatile void* pachet, int length);
int (*recv) (struct eth_device*);
void (*halt) (struct eth_device*);
struct eth_device *next;
void *priv;
};
extern int eth_initialize(bd_t *bis); /* Initialize network subsystem */
extern int eth_register(struct eth_device* dev);/* Register network device */
extern void eth_try_another(int first_restart); /* Change the device */
extern struct eth_device *eth_get_dev(void); /* get the current device MAC */
extern void eth_set_enetaddr(int num, char* a); /* Set new MAC address */
#endif
extern int eth_init(bd_t *bis); /* Initialize the device */
extern int eth_send(volatile void *packet, int length); /* Send a packet */
extern int eth_rx(void); /* Check for received packets */
extern void eth_halt(void); /* stop SCC */
/**********************************************************************/
/*
* Protocol headers.
*/
/*
* Ethernet header
*/
typedef struct {
uchar et_dest[6]; /* Destination node */
uchar et_src[6]; /* Source node */
ushort et_protlen; /* Protocol or length */
uchar et_dsap; /* 802 DSAP */
uchar et_ssap; /* 802 SSAP */
uchar et_ctl; /* 802 control */
uchar et_snap1; /* SNAP */
uchar et_snap2;
uchar et_snap3;
ushort et_prot; /* 802 protocol */
} Ethernet_t;
#define ETHER_HDR_SIZE 14 /* Ethernet header size */
#define E802_HDR_SIZE 22 /* 802 ethernet header size */
#define PROT_IP 0x0800 /* IP protocol */
#define PROT_ARP 0x0806 /* IP ARP protocol */
#define PROT_RARP 0x8035 /* IP ARP protocol */
#define IPPROTO_ICMP 1 /* Internet Control Message Protocol */
#define IPPROTO_UDP 17 /* User Datagram Protocol */
/*
* Internet Protocol (IP) header.
*/
typedef struct {
uchar ip_hl_v; /* header length and version */
uchar ip_tos; /* type of service */
ushort ip_len; /* total length */
ushort ip_id; /* identification */
ushort ip_off; /* fragment offset field */
uchar ip_ttl; /* time to live */
uchar ip_p; /* protocol */
ushort ip_sum; /* checksum */
IPaddr_t ip_src; /* Source IP address */
IPaddr_t ip_dst; /* Destination IP address */
ushort udp_src; /* UDP source port */
ushort udp_dst; /* UDP destination port */
ushort udp_len; /* Length of UDP packet */
ushort udp_xsum; /* Checksum */
} IP_t;
#define IP_HDR_SIZE_NO_UDP (sizeof (IP_t) - 8)
#define IP_HDR_SIZE (sizeof (IP_t))
/*
* Address Resolution Protocol (ARP) header.
*/
typedef struct
{
ushort ar_hrd; /* Format of hardware address */
# define ARP_ETHER 1 /* Ethernet hardware address */
ushort ar_pro; /* Format of protocol address */
uchar ar_hln; /* Length of hardware address */
uchar ar_pln; /* Length of protocol address */
ushort ar_op; /* Operation */
# define ARPOP_REQUEST 1 /* Request to resolve address */
# define ARPOP_REPLY 2 /* Response to previous request */
# define RARPOP_REQUEST 3 /* Request to resolve address */
# define RARPOP_REPLY 4 /* Response to previous request */
/*
* The remaining fields are variable in size, according to
* the sizes above, and are defined as appropriate for
* specific hardware/protocol combinations.
*/
uchar ar_data[0];
#if 0
uchar ar_sha[]; /* Sender hardware address */
uchar ar_spa[]; /* Sender protocol address */
uchar ar_tha[]; /* Target hardware address */
uchar ar_tpa[]; /* Target protocol address */
#endif /* 0 */
} ARP_t;
#define ARP_HDR_SIZE (8+20) /* Size assuming ethernet */
/*
* ICMP stuff (just enough to handle (host) redirect messages)
*/
#define ICMP_REDIRECT 5 /* Redirect (change route) */
/* Codes for REDIRECT. */
#define ICMP_REDIR_NET 0 /* Redirect Net */
#define ICMP_REDIR_HOST 1 /* Redirect Host */
typedef struct icmphdr {
uchar type;
uchar code;
ushort checksum;
union {
struct {
ushort id;
ushort sequence;
} echo;
ulong gateway;
struct {
ushort __unused;
ushort mtu;
} frag;
} un;
} ICMP_t;
/*
* Maximum packet size; used to allocate packet storage.
* TFTP packets can be 524 bytes + IP header + ethernet header.
* Lets be conservative, and go for 38 * 16. (Must also be
* a multiple of 32 bytes).
*/
/*
* AS.HARNOIS : Better to set PKTSIZE to maximum size because
* traffic type is not always controlled
* maximum packet size = 1518
* maximum packet size and multiple of 32 bytes = 1536
*/
#define PKTSIZE 1518
#define PKTSIZE_ALIGN 1536
/*#define PKTSIZE 608*/
/*
* Maximum receive ring size; that is, the number of packets
* we can buffer before overflow happens. Basically, this just
* needs to be enough to prevent a packet being discarded while
* we are processing the previous one.
*/
#define RINGSZ 4
#define RINGSZ_LOG2 2
/**********************************************************************/
/*
* Globals.
*
* Note:
*
* All variables of type IPaddr_t are stored in NETWORK byte order
* (big endian).
*/
/* net.c */
/** BOOTP EXTENTIONS **/
extern IPaddr_t NetOurGatewayIP; /* Our gateway IP addresse */
extern IPaddr_t NetOurSubnetMask; /* Our subnet mask (0 = unknown)*/
extern IPaddr_t NetOurDNSIP; /* Our Domain Name Server (0 = unknown)*/
extern char NetOurNISDomain[32]; /* Our NIS domain */
extern char NetOurHostName[32]; /* Our hostname */
extern char NetOurRootPath[64]; /* Our root path */
extern ushort NetBootFileSize; /* Our boot file size in blocks */
/** END OF BOOTP EXTENTIONS **/
extern ulong NetBootFileXferSize; /* size of bootfile in bytes */
extern uchar NetOurEther[6]; /* Our ethernet address */
extern uchar NetServerEther[6]; /* Boot server enet address */
extern IPaddr_t NetOurIP; /* Our IP addr (0 = unknown) */
extern IPaddr_t NetServerIP; /* Server IP addr (0 = unknown) */
extern volatile uchar * NetTxPacket; /* THE transmit packet */
extern volatile uchar * NetRxPackets[PKTBUFSRX];/* Receive packets */
extern volatile uchar * NetRxPkt; /* Current receive packet */
extern int NetRxPktLen; /* Current rx packet length */
extern unsigned NetIPID; /* IP ID (counting) */
extern uchar NetBcastAddr[6]; /* Ethernet boardcast address */
extern int NetState; /* Network loop state */
#define NETLOOP_CONTINUE 1
#define NETLOOP_RESTART 2
#define NETLOOP_SUCCESS 3
#define NETLOOP_FAIL 4
#ifdef CONFIG_NET_MULTI
extern int NetRestartWrap; /* Tried all network devices */
#endif
typedef enum { BOOTP, RARP, ARP, TFTP, DHCP } proto_t;
/* from net/net.c */
extern char BootFile[128]; /* Boot File name */
/* Initialize the network adapter */
extern int NetLoop(proto_t);
/* Shutdown adapters and cleanup */
extern void NetStop(void);
/* Load failed. Start again. */
extern void NetStartAgain(void);
/* Set ethernet header */
extern void NetSetEther(volatile uchar *, uchar *, uint);
/* Set IP header */
extern void NetSetIP(volatile uchar *, IPaddr_t, int, int, int);
/* Checksum */
extern int NetCksumOk(uchar *, int); /* Return true if cksum OK */
extern uint NetCksum(uchar *, int); /* Calculate the checksum */
/* Set callbacks */
extern void NetSetHandler(rxhand_f *); /* Set RX packet handler */
extern void NetSetTimeout(int, thand_f *); /* Set timeout handler */
/* Transmit "NetTxPacket" */
extern void NetSendPacket(volatile uchar *, int);
/* Processes a received packet */
extern void NetReceive(volatile uchar *, int);
/* Print an IP address on the console */
extern void print_IPaddr (IPaddr_t);
/*
* The following functions are a bit ugly, but necessary to deal with
* alignment restrictions on ARM.
*
* We're using inline functions, which had the smallest memory
* footprint in our tests.
*/
/* return IP *in network byteorder* */
static inline IPaddr_t NetReadIP(void *from)
{
IPaddr_t ip;
memcpy((void*)&ip, from, sizeof(ip));
return ip;
}
/* return ulong *in network byteorder* */
static inline ulong NetReadLong(ulong *from)
{
ulong l;
memcpy((void*)&l, (void*)from, sizeof(l));
return l;
}
/* write IP *in network byteorder* */
static inline void NetWriteIP(void *to, IPaddr_t ip)
{
memcpy(to, (void*)&ip, sizeof(ip));
}
/* copy IP */
static inline void NetCopyIP(void *to, void *from)
{
memcpy(to, from, sizeof(IPaddr_t));
}
/* copy ulong */
static inline void NetCopyLong(ulong *to, ulong *from)
{
memcpy((void*)to, (void*)from, sizeof(ulong));
}
/* Convert an IP address to a string */
extern void ip_to_string (IPaddr_t x, char *s);
/* read an IP address from a environment variable */
extern IPaddr_t getenv_IPaddr (char *);
/* copy a filename (allow for "..." notation, limit length) */
extern void copy_filename (uchar *dst, uchar *src, int size);
/**********************************************************************/
#endif /* __NET_H__ */

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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 2000-2002 Wolfgang Denk, wd@denx.de
*/
/*
* 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 <watchdog.h>
#include <command.h>
#include <net.h>
#include "bootp.h"
#include "tftp.h"
#include "rarp.h"
#include "arp.h"
#if (CONFIG_COMMANDS & CFG_CMD_NET)
#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 */
ushort NetBootFileSize=0; /* Our bootfile size in blocks */
/** END OF BOOTP EXTENTIONS **/
ulong NetBootFileXferSize; /* The actual transferred size of the bootfile (in bytes) */
uchar NetOurEther[6]; /* Our ethernet address */
uchar 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 uchar *NetRxPkt; /* Current receive packet */
int NetRxPktLen; /* Current rx packet length */
unsigned NetIPID; /* IP packet ID */
uchar NetBcastAddr[6] = /* Ethernet bcast address */
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
int NetState; /* Network loop state */
#ifdef CONFIG_NET_MULTI
int NetRestartWrap = 0; /* Tried all network devices */
static int NetRestarted = 0; /* Network loop restarted */
static int NetDevExists = 0; /* At least one device configured */
#endif
char BootFile[128]; /* Boot File name */
volatile uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets */
static rxhand_f *packetHandler; /* Current RX packet handler */
static thand_f *timeHandler; /* Current timeout handler */
static ulong timeValue; /* Current timeout value */
volatile uchar *NetTxPacket = 0; /* THE transmit packet */
static int net_check_prereq (proto_t protocol);
/**********************************************************************/
/*
* Main network processing loop.
*/
int
NetLoop(proto_t protocol)
{
DECLARE_GLOBAL_DATA_PTR;
bd_t *bd = gd->bd;
#ifdef CONFIG_NET_MULTI
NetRestarted = 0;
NetDevExists = 0;
#endif
if (!NetTxPacket) {
int i;
/*
* Setup packet buffers, aligned correctly.
*/
NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
for (i = 0; i < PKTBUFSRX; i++) {
NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
}
}
eth_halt();
eth_init(bd);
restart:
#ifdef CONFIG_NET_MULTI
memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
#else
memcpy (NetOurEther, bd->bi_enetaddr, 6);
#endif
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.
*/
switch (protocol) {
case TFTP:
NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
NetServerIP = getenv_IPaddr ("serverip");
NetOurGatewayIP = getenv_IPaddr ("gatewayip");
NetOurSubnetMask= getenv_IPaddr ("netmask");
break;
case BOOTP:
case 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;
break;
default:
break;
}
switch (net_check_prereq (protocol)) {
case 1:
/* network not configured */
return 0;
#ifdef CONFIG_NET_MULTI
case 2:
/* network device not configured */
break;
#endif /* CONFIG_NET_MULTI */
case 0:
#ifdef CONFIG_NET_MULTI
NetDevExists = 1;
#endif
switch (protocol) {
case TFTP:
/* always use ARP to get server ethernet address */
ArpTry = 0;
ArpRequest ();
break;
#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
case DHCP:
/* Start with a clean slate... */
NetOurIP = 0;
NetServerIP = 0;
DhcpRequest(); /* Basically same as BOOTP */
break;
#endif /* CFG_CMD_DHCP */
case BOOTP:
BootpTry = 0;
BootpRequest ();
break;
case RARP:
RarpTry = 0;
RarpRequest ();
break;
default:
break;
}
NetBootFileXferSize = 0;
break;
}
/*
* Main packet reception loop. Loop receiving packets until
* someone sets `NetQuit'.
*/
for (;;) {
WATCHDOG_RESET();
#ifdef CONFIG_SHOW_ACTIVITY
{
extern void show_activity(int arg);
show_activity(1);
}
#endif
/*
* 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:
#ifdef CONFIG_NET_MULTI
NetRestarted = 1;
#endif
goto restart;
case NETLOOP_SUCCESS:
if (NetBootFileXferSize > 0) {
char buf[10];
printf("Bytes transferred = %ld (%lx hex)\n",
NetBootFileXferSize,
NetBootFileXferSize);
sprintf(buf, "%lx", NetBootFileXferSize);
setenv("filesize", buf);
}
eth_halt();
return NetBootFileXferSize;
case NETLOOP_FAIL:
return 0;
}
}
}
/**********************************************************************/
static void
startAgainTimeout(void)
{
NetState = NETLOOP_RESTART;
}
static void
startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
{
/* Totally ignore the packet */
}
void
NetStartAgain(void)
{
#ifndef CONFIG_NET_MULTI
NetSetTimeout(10 * CFG_HZ, startAgainTimeout);
NetSetHandler(startAgainHandler);
#else
DECLARE_GLOBAL_DATA_PTR;
eth_halt();
eth_try_another(!NetRestarted);
eth_init(gd->bd);
if (NetRestartWrap)
{
NetRestartWrap = 0;
if (NetDevExists)
{
NetSetTimeout(10 * CFG_HZ, startAgainTimeout);
NetSetHandler(startAgainHandler);
}
else
{
NetState = NETLOOP_FAIL;
}
}
else
{
NetState = NETLOOP_RESTART;
}
#endif
}
/**********************************************************************/
/*
* 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 uchar * pkt, int len)
{
(void) eth_send(pkt, len);
}
void
NetReceive(volatile uchar * pkt, int len)
{
Ethernet_t *et;
IP_t *ip;
ARP_t *arp;
IPaddr_t tmp;
int x;
NetRxPkt = pkt;
NetRxPktLen = len;
et = (Ethernet_t *)pkt;
x = ntohs(et->et_protlen);
if (x < 1514) {
/*
* Got a 802 packet. Check the other protocol field.
*/
x = ntohs(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 (ntohs(arp->ar_hrd) != ARP_ETHER) {
return;
}
if (ntohs(arp->ar_pro) != PROT_IP) {
return;
}
if (arp->ar_hln != 6) {
return;
}
if (arp->ar_pln != 4) {
return;
}
if (NetOurIP == 0) {
return;
}
if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
return;
}
switch (ntohs(arp->ar_op)) {
case ARPOP_REQUEST: /* reply with our IP address */
#ifdef ET_DEBUG
printf("Got ARP REQUEST, return our IP\n");
#endif
NetSetEther((uchar *)et, et->et_src, PROT_ARP);
arp->ar_op = htons(ARPOP_REPLY);
memcpy (&arp->ar_data[10], &arp->ar_data[0], 6);
NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
memcpy (&arp->ar_data[ 0], NetOurEther, 6);
NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
NetSendPacket((uchar *)et,((uchar *)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
memcpy (NetServerEther, &arp->ar_data[0], 6);
(*packetHandler)(0,0,0,0); /* start TFTP */
return;
default:
#ifdef ET_DEBUG
printf("Unexpected ARP opcode 0x%x\n", ntohs(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 ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
(ntohs(arp->ar_hrd) != ARP_ETHER) ||
(ntohs(arp->ar_pro) != PROT_IP) ||
(arp->ar_hln != 6) || (arp->ar_pln != 4)) {
printf("invalid RARP header\n");
} else {
NetCopyIP(&NetOurIP, &arp->ar_data[16]);
NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
memcpy (NetServerEther, &arp->ar_data[ 0], 6);
(*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 < ntohs(ip->ip_len)) {
printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
return;
}
len = ntohs(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 & htons(0x1fff)) { /* Can't deal w/ fragments */
return;
}
if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
printf("checksum bad\n");
return;
}
tmp = NetReadIP(&ip->ip_dst);
if (NetOurIP && tmp != NetOurIP && tmp != 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;
puts (" 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)((uchar *)ip +IP_HDR_SIZE,
ntohs(ip->udp_dst),
ntohs(ip->udp_src),
ntohs(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) {
puts ("*** ERROR: `serverip' not set\n");
return (1);
}
if (NetOurIP == 0) {
puts ("*** 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) {
#ifdef CONFIG_NET_MULTI
extern int eth_get_dev_index (void);
int num = eth_get_dev_index();
switch (num) {
case -1:
puts ("*** ERROR: No ethernet found.\n");
return (1);
case 0:
puts ("*** ERROR: `ethaddr' not set\n");
break;
default:
printf ("*** ERROR: `eth%daddr' not set\n",
num);
break;
}
NetStartAgain ();
return (2);
#else
puts ("*** ERROR: `ethaddr' not set\n");
return (1);
#endif
}
/* Fall through */
}
return (0); /* OK */
}
/**********************************************************************/
int
NetCksumOk(uchar * ptr, int len)
{
return !((NetCksum(ptr, len) + 1) & 0xfffe);
}
unsigned
NetCksum(uchar * ptr, int len)
{
ulong xsum;
xsum = 0;
while (len-- > 0)
xsum += *((ushort *)ptr)++;
xsum = (xsum & 0xffff) + (xsum >> 16);
xsum = (xsum & 0xffff) + (xsum >> 16);
return (xsum & 0xffff);
}
void
NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
{
Ethernet_t *et = (Ethernet_t *)xet;
memcpy (et->et_dest, addr, 6);
memcpy (et->et_src, NetOurEther, 6);
et->et_protlen = htons(prot);
}
void
NetSetIP(volatile uchar * 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 = htons(IP_HDR_SIZE + len);
ip->ip_id = htons(NetIPID++);
ip->ip_off = htons(0x4000); /* No fragmentation */
ip->ip_ttl = 255;
ip->ip_p = 17; /* UDP */
ip->ip_sum = 0;
NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
NetCopyIP((void*)&ip->ip_dst, &dest); /* - "" - */
ip->udp_src = htons(sport);
ip->udp_dst = htons(dport);
ip->udp_len = htons(8 + len);
ip->udp_xsum = 0;
ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
}
void copy_filename (uchar *dst, uchar *src, int size)
{
if (*src && (*src == '"')) {
++src;
--size;
}
while ((--size > 0) && *src && (*src != '"')) {
*dst++ = *src++;
}
*dst = '\0';
}
#endif /* CFG_CMD_NET */
void ip_to_string (IPaddr_t x, char *s)
{
x = ntohl(x);
sprintf (s,"%d.%d.%d.%d",
(int)((x >> 24) & 0xff),
(int)((x >> 16) & 0xff),
(int)((x >> 8) & 0xff),
(int)((x >> 0) & 0xff)
);
}
void print_IPaddr (IPaddr_t x)
{
char tmp[16];
ip_to_string(x, tmp);
puts(tmp);
}
IPaddr_t getenv_IPaddr (char *var)
{
IPaddr_t addr;
char *s, *e;
int i;
s = getenv (var);
for (addr=0, i=0; i<4; ++i) {
ulong val = s ? simple_strtoul(s, &e, 10) : 0;
addr <<= 8;
addr |= (val & 0xFF);
if (s) {
s = (*e) ? e+1 : e;
}
}
return (htonl(addr));
}