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net.c
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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, [email protected]
*/
/*
* 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
*
* NFS:
*
* Prerequisites: - own ethernet address
* - own IP 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
*
* SNTP:
*
* Prerequisites: - own ethernet address
* - own IP address
* We want: - network time
* 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 "nfs.h"
#ifdef CONFIG_STATUS_LED
#include <status_led.h>
#include <miiphy.h>
#endif
#if defined(CONFIG_CMD_SNTP)
#include "sntp.h"
#endif
#if defined(CONFIG_CDP_VERSION)
#include <timestamp.h>
#endif
#if defined(CONFIG_CMD_DNS)
#include "dns.h"
#endif
DECLARE_GLOBAL_DATA_PTR;
#ifndef CONFIG_ARP_TIMEOUT
# define ARP_TIMEOUT 5000UL /* Milliseconds before trying ARP again */
#else
# define ARP_TIMEOUT CONFIG_ARP_TIMEOUT
#endif
#ifndef CONFIG_NET_RETRY_COUNT
# define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */
#else
# define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT
#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 */
#if defined(CONFIG_BOOTP_DNS2)
IPaddr_t NetOurDNS2IP=0; /* Our 2nd DNS IP address */
#endif
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 */
#ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */
IPaddr_t Mcast_addr;
#endif
/** 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 */
{ 0, 0, 0, 0, 0, 0 };
IPaddr_t NetOurIP; /* Our IP addr (0 = unknown) */
IPaddr_t NetServerIP; /* Server IP addr (0 = unknown) */
volatile uchar *NetRxPacket; /* Current receive packet */
int NetRxPacketLen; /* Current rx packet length */
unsigned NetIPID; /* IP packet ID */
uchar NetBcastAddr[6] = /* Ethernet bcast address */
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
uchar NetEtherNullAddr[6] =
{ 0, 0, 0, 0, 0, 0 };
#ifdef CONFIG_API
void (*push_packet)(volatile void *, int len) = 0;
#endif
#if defined(CONFIG_CMD_CDP)
uchar NetCDPAddr[6] = /* Ethernet bcast address */
{ 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
#endif
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
/* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
ushort NetOurVLAN = 0xFFFF; /* default is without VLAN */
ushort NetOurNativeVLAN = 0xFFFF; /* ditto */
char BootFile[128]; /* Boot File name */
#if defined(CONFIG_CMD_PING)
IPaddr_t NetPingIP; /* the ip address to ping */
static void PingStart(void);
#endif
#if defined(CONFIG_CMD_CDP)
static void CDPStart(void);
#endif
#if defined(CONFIG_CMD_SNTP)
IPaddr_t NetNtpServerIP; /* NTP server IP address */
int NetTimeOffset=0; /* offset time from UTC */
#endif
#ifdef CONFIG_NETCONSOLE
void NcStart(void);
int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
#endif
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 timeStart; /* Time base value */
static ulong timeDelta; /* Current timeout value */
volatile uchar *NetTxPacket = 0; /* THE transmit packet */
static int net_check_prereq (proto_t protocol);
static int NetTryCount;
/**********************************************************************/
IPaddr_t NetArpWaitPacketIP;
IPaddr_t NetArpWaitReplyIP;
uchar *NetArpWaitPacketMAC; /* MAC address of waiting packet's destination */
uchar *NetArpWaitTxPacket; /* THE transmit packet */
int NetArpWaitTxPacketSize;
uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
ulong NetArpWaitTimerStart;
int NetArpWaitTry;
void ArpRequest (void)
{
int i;
volatile uchar *pkt;
ARP_t *arp;
debug("ARP broadcast %d\n", NetArpWaitTry);
pkt = NetTxPacket;
pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
arp = (ARP_t *) pkt;
arp->ar_hrd = htons (ARP_ETHER);
arp->ar_pro = htons (PROT_IP);
arp->ar_hln = 6;
arp->ar_pln = 4;
arp->ar_op = htons (ARPOP_REQUEST);
memcpy (&arp->ar_data[0], NetOurEther, 6); /* source ET addr */
NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP); /* source IP addr */
for (i = 10; i < 16; ++i) {
arp->ar_data[i] = 0; /* dest ET addr = 0 */
}
if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
(NetOurIP & NetOurSubnetMask)) {
if (NetOurGatewayIP == 0) {
puts ("## Warning: gatewayip needed but not set\n");
NetArpWaitReplyIP = NetArpWaitPacketIP;
} else {
NetArpWaitReplyIP = NetOurGatewayIP;
}
} else {
NetArpWaitReplyIP = NetArpWaitPacketIP;
}
NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
(void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
}
void ArpTimeoutCheck(void)
{
ulong t;
if (!NetArpWaitPacketIP)
return;
t = get_timer(0);
/* check for arp timeout */
if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
NetArpWaitTry++;
if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
puts ("\nARP Retry count exceeded; starting again\n");
NetArpWaitTry = 0;
NetStartAgain();
} else {
NetArpWaitTimerStart = t;
ArpRequest();
}
}
}
static void
NetInitLoop(proto_t protocol)
{
static int env_changed_id = 0;
bd_t *bd = gd->bd;
int env_id = get_env_id ();
/* update only when the environment has changed */
if (env_changed_id != env_id) {
NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
NetOurGatewayIP = getenv_IPaddr ("gatewayip");
NetOurSubnetMask= getenv_IPaddr ("netmask");
NetServerIP = getenv_IPaddr ("serverip");
NetOurNativeVLAN = getenv_VLAN("nvlan");
NetOurVLAN = getenv_VLAN("vlan");
#if defined(CONFIG_CMD_DNS)
NetOurDNSIP = getenv_IPaddr("dnsip");
#endif
env_changed_id = env_id;
}
return;
}
/**********************************************************************/
/*
* Main network processing loop.
*/
int
NetLoop(proto_t protocol)
{
bd_t *bd = gd->bd;
#ifdef CONFIG_NET_MULTI
NetRestarted = 0;
NetDevExists = 0;
#endif
/* XXX problem with bss workaround */
NetArpWaitPacketMAC = NULL;
NetArpWaitTxPacket = NULL;
NetArpWaitPacketIP = 0;
NetArpWaitReplyIP = 0;
NetArpWaitTxPacket = NULL;
NetTxPacket = NULL;
NetTryCount = 1;
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;
}
}
if (!NetArpWaitTxPacket) {
NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
NetArpWaitTxPacketSize = 0;
}
eth_halt();
#ifdef CONFIG_NET_MULTI
eth_set_current();
#endif
if (eth_init(bd) < 0) {
eth_halt();
return(-1);
}
restart:
#ifdef CONFIG_NET_MULTI
memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
#else
eth_getenv_enetaddr("ethaddr", NetOurEther);
#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.
*/
NetInitLoop(protocol);
switch (net_check_prereq (protocol)) {
case 1:
/* network not configured */
eth_halt();
return (-1);
#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 */
TftpStart();
break;
#if defined(CONFIG_CMD_DHCP)
case DHCP:
BootpTry = 0;
NetOurIP = 0;
DhcpRequest(); /* Basically same as BOOTP */
break;
#endif
case BOOTP:
BootpTry = 0;
NetOurIP = 0;
BootpRequest ();
break;
case RARP:
RarpTry = 0;
NetOurIP = 0;
RarpRequest ();
break;
#if defined(CONFIG_CMD_PING)
case PING:
PingStart();
break;
#endif
#if defined(CONFIG_CMD_NFS)
case NFS:
NfsStart();
break;
#endif
#if defined(CONFIG_CMD_CDP)
case CDP:
CDPStart();
break;
#endif
#ifdef CONFIG_NETCONSOLE
case NETCONS:
NcStart();
break;
#endif
#if defined(CONFIG_CMD_SNTP)
case SNTP:
SntpStart();
break;
#endif
#if defined(CONFIG_CMD_DNS)
case DNS:
DnsStart();
break;
#endif
default:
break;
}
NetBootFileXferSize = 0;
break;
}
#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
#if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
/*
* Echo the inverted link state to the fault LED.
*/
if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
} else {
status_led_set (STATUS_LED_RED, STATUS_LED_ON);
}
#endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
#endif /* CONFIG_MII, ... */
/*
* Main packet reception loop. Loop receiving packets until
* someone sets `NetState' to a state that terminates.
*/
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();
puts ("\nAbort\n");
return (-1);
}
ArpTimeoutCheck();
/*
* Check for a timeout, and run the timeout handler
* if we have one.
*/
if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
thand_f *x;
#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
# if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
defined(CONFIG_STATUS_LED) && \
defined(STATUS_LED_RED)
/*
* Echo the inverted link state to the fault LED.
*/
if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
} else {
status_led_set (STATUS_LED_RED, STATUS_LED_ON);
}
# endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
#endif /* CONFIG_MII, ... */
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[20];
printf("Bytes transferred = %ld (%lx hex)\n",
NetBootFileXferSize,
NetBootFileXferSize);
sprintf(buf, "%lX", NetBootFileXferSize);
setenv("filesize", buf);
sprintf(buf, "%lX", (unsigned long)load_addr);
setenv("fileaddr", buf);
}
eth_halt();
return NetBootFileXferSize;
case NETLOOP_FAIL:
return (-1);
}
}
}
/**********************************************************************/
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)
{
char *nretry;
int retry_forever = 0;
unsigned long retrycnt = 0;
nretry = getenv("netretry");
if (nretry) {
if (!strcmp(nretry, "yes"))
retry_forever = 1;
else if (!strcmp(nretry, "no"))
retrycnt = 0;
else if (!strcmp(nretry, "once"))
retrycnt = 1;
else
retrycnt = simple_strtoul(nretry, NULL, 0);
} else
retry_forever = 1;
if ((!retry_forever) && (NetTryCount >= retrycnt)) {
eth_halt();
NetState = NETLOOP_FAIL;
return;
}
NetTryCount++;
#ifndef CONFIG_NET_MULTI
NetSetTimeout (10000UL, startAgainTimeout);
NetSetHandler (startAgainHandler);
#else /* !CONFIG_NET_MULTI*/
eth_halt ();
#if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
eth_try_another (!NetRestarted);
#endif
eth_init (gd->bd);
if (NetRestartWrap) {
NetRestartWrap = 0;
if (NetDevExists) {
NetSetTimeout (10000UL, startAgainTimeout);
NetSetHandler (startAgainHandler);
} else {
NetState = NETLOOP_FAIL;
}
} else {
NetState = NETLOOP_RESTART;
}
#endif /* CONFIG_NET_MULTI */
}
/**********************************************************************/
/*
* Miscelaneous bits.
*/
void
NetSetHandler(rxhand_f * f)
{
packetHandler = f;
}
void
NetSetTimeout(ulong iv, thand_f * f)
{
if (iv == 0) {
timeHandler = (thand_f *)0;
} else {
timeHandler = f;
timeStart = get_timer(0);
timeDelta = iv;
}
}
void
NetSendPacket(volatile uchar * pkt, int len)
{
(void) eth_send(pkt, len);
}
int
NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
{
uchar *pkt;
/* convert to new style broadcast */
if (dest == 0)
dest = 0xFFFFFFFF;
/* if broadcast, make the ether address a broadcast and don't do ARP */
if (dest == 0xFFFFFFFF)
ether = NetBcastAddr;
/* if MAC address was not discovered yet, save the packet and do an ARP request */
if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
debug("sending ARP for %08lx\n", dest);
NetArpWaitPacketIP = dest;
NetArpWaitPacketMAC = ether;
pkt = NetArpWaitTxPacket;
pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
NetSetIP (pkt, dest, dport, sport, len);
memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
/* size of the waiting packet */
NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
/* and do the ARP request */
NetArpWaitTry = 1;
NetArpWaitTimerStart = get_timer(0);
ArpRequest();
return 1; /* waiting */
}
debug("sending UDP to %08lx/%pM\n", dest, ether);
pkt = (uchar *)NetTxPacket;
pkt += NetSetEther (pkt, ether, PROT_IP);
NetSetIP (pkt, dest, dport, sport, len);
(void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
return 0; /* transmitted */
}
#if defined(CONFIG_CMD_PING)
static ushort PingSeqNo;
int PingSend(void)
{
static uchar mac[6];
volatile IP_t *ip;
volatile ushort *s;
uchar *pkt;
/* XXX always send arp request */
memcpy(mac, NetEtherNullAddr, 6);
debug("sending ARP for %08lx\n", NetPingIP);
NetArpWaitPacketIP = NetPingIP;
NetArpWaitPacketMAC = mac;
pkt = NetArpWaitTxPacket;
pkt += NetSetEther(pkt, mac, PROT_IP);
ip = (volatile IP_t *)pkt;
/*
* Construct an IP and ICMP 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_NO_UDP + 8);
ip->ip_id = htons(NetIPID++);
ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
ip->ip_ttl = 255;
ip->ip_p = 0x01; /* ICMP */
ip->ip_sum = 0;
NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
NetCopyIP((void*)&ip->ip_dst, &NetPingIP); /* - "" - */
ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
s = &ip->udp_src; /* XXX ICMP starts here */
s[0] = htons(0x0800); /* echo-request, code */
s[1] = 0; /* checksum */
s[2] = 0; /* identifier */
s[3] = htons(PingSeqNo++); /* sequence number */
s[1] = ~NetCksum((uchar *)s, 8/2);
/* size of the waiting packet */
NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
/* and do the ARP request */
NetArpWaitTry = 1;
NetArpWaitTimerStart = get_timer(0);
ArpRequest();
return 1; /* waiting */
}
static void
PingTimeout (void)
{
eth_halt();
NetState = NETLOOP_FAIL; /* we did not get the reply */
}
static void
PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
{
IPaddr_t tmp;
volatile IP_t *ip = (volatile IP_t *)pkt;
tmp = NetReadIP((void *)&ip->ip_src);
if (tmp != NetPingIP)
return;
NetState = NETLOOP_SUCCESS;
}
static void PingStart(void)
{
#if defined(CONFIG_NET_MULTI)
printf ("Using %s device\n", eth_get_name());
#endif /* CONFIG_NET_MULTI */
NetSetTimeout (10000UL, PingTimeout);
NetSetHandler (PingHandler);
PingSend();
}
#endif
#if defined(CONFIG_CMD_CDP)
#define CDP_DEVICE_ID_TLV 0x0001
#define CDP_ADDRESS_TLV 0x0002
#define CDP_PORT_ID_TLV 0x0003
#define CDP_CAPABILITIES_TLV 0x0004
#define CDP_VERSION_TLV 0x0005
#define CDP_PLATFORM_TLV 0x0006
#define CDP_NATIVE_VLAN_TLV 0x000a
#define CDP_APPLIANCE_VLAN_TLV 0x000e
#define CDP_TRIGGER_TLV 0x000f
#define CDP_POWER_CONSUMPTION_TLV 0x0010
#define CDP_SYSNAME_TLV 0x0014
#define CDP_SYSOBJECT_TLV 0x0015
#define CDP_MANAGEMENT_ADDRESS_TLV 0x0016
#define CDP_TIMEOUT 250UL /* one packet every 250ms */
static int CDPSeq;
static int CDPOK;
ushort CDPNativeVLAN;
ushort CDPApplianceVLAN;
static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
static ushort CDP_compute_csum(const uchar *buff, ushort len)
{
ushort csum;
int odd;
ulong result = 0;
ushort leftover;
ushort *p;
if (len > 0) {
odd = 1 & (ulong)buff;
if (odd) {
result = *buff << 8;
len--;
buff++;
}
while (len > 1) {
p = (ushort *)buff;
result += *p++;
buff = (uchar *)p;
if (result & 0x80000000)
result = (result & 0xFFFF) + (result >> 16);
len -= 2;
}
if (len) {
leftover = (signed short)(*(const signed char *)buff);
/* CISCO SUCKS big time! (and blows too):
* CDP uses the IP checksum algorithm with a twist;
* for the last byte it *sign* extends and sums.
*/
result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
}
while (result >> 16)
result = (result & 0xFFFF) + (result >> 16);
if (odd)
result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
}
/* add up 16-bit and 17-bit words for 17+c bits */
result = (result & 0xffff) + (result >> 16);
/* add up 16-bit and 2-bit for 16+c bit */
result = (result & 0xffff) + (result >> 16);
/* add up carry.. */
result = (result & 0xffff) + (result >> 16);
/* negate */
csum = ~(ushort)result;
/* run time endian detection */
if (csum != htons(csum)) /* little endian */
csum = htons(csum);
return csum;
}
int CDPSendTrigger(void)
{
volatile uchar *pkt;
volatile ushort *s;
volatile ushort *cp;
Ethernet_t *et;
int len;
ushort chksum;
#if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \
defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM)
char buf[32];
#endif
pkt = NetTxPacket;
et = (Ethernet_t *)pkt;
/* NOTE: trigger sent not on any VLAN */
/* form ethernet header */
memcpy(et->et_dest, NetCDPAddr, 6);
memcpy(et->et_src, NetOurEther, 6);
pkt += ETHER_HDR_SIZE;
/* SNAP header */
memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
pkt += sizeof(CDP_SNAP_hdr);
/* CDP header */
*pkt++ = 0x02; /* CDP version 2 */
*pkt++ = 180; /* TTL */
s = (volatile ushort *)pkt;
cp = s;
*s++ = htons(0); /* checksum (0 for later calculation) */
/* CDP fields */
#ifdef CONFIG_CDP_DEVICE_ID
*s++ = htons(CDP_DEVICE_ID_TLV);
*s++ = htons(CONFIG_CDP_DEVICE_ID);
sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
memcpy((uchar *)s, buf, 16);
s += 16 / 2;
#endif
#ifdef CONFIG_CDP_PORT_ID
*s++ = htons(CDP_PORT_ID_TLV);
memset(buf, 0, sizeof(buf));
sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
len = strlen(buf);
if (len & 1) /* make it even */
len++;
*s++ = htons(len + 4);
memcpy((uchar *)s, buf, len);
s += len / 2;
#endif
#ifdef CONFIG_CDP_CAPABILITIES
*s++ = htons(CDP_CAPABILITIES_TLV);
*s++ = htons(8);
*(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
s += 2;
#endif
#ifdef CONFIG_CDP_VERSION
*s++ = htons(CDP_VERSION_TLV);
memset(buf, 0, sizeof(buf));
strcpy(buf, CONFIG_CDP_VERSION);
len = strlen(buf);
if (len & 1) /* make it even */
len++;
*s++ = htons(len + 4);
memcpy((uchar *)s, buf, len);
s += len / 2;
#endif
#ifdef CONFIG_CDP_PLATFORM
*s++ = htons(CDP_PLATFORM_TLV);
memset(buf, 0, sizeof(buf));
strcpy(buf, CONFIG_CDP_PLATFORM);
len = strlen(buf);
if (len & 1) /* make it even */
len++;
*s++ = htons(len + 4);
memcpy((uchar *)s, buf, len);
s += len / 2;
#endif
#ifdef CONFIG_CDP_TRIGGER
*s++ = htons(CDP_TRIGGER_TLV);
*s++ = htons(8);
*(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
s += 2;
#endif
#ifdef CONFIG_CDP_POWER_CONSUMPTION
*s++ = htons(CDP_POWER_CONSUMPTION_TLV);
*s++ = htons(6);
*s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
#endif
/* length of ethernet packet */
len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
et->et_protlen = htons(len);
len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
if (chksum == 0)
chksum = 0xFFFF;
*cp = htons(chksum);
(void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
return 0;
}
static void
CDPTimeout (void)
{
CDPSeq++;
if (CDPSeq < 3) {
NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
CDPSendTrigger();
return;
}
/* if not OK try again */
if (!CDPOK)
NetStartAgain();
else
NetState = NETLOOP_SUCCESS;
}
static void
CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
{
/* nothing */
}
static void
CDPHandler(const uchar * pkt, unsigned len)
{
const uchar *t;
const ushort *ss;
ushort type, tlen;
uchar applid;