blob: b4884906077af1c1da96448cd56c015cd7144d8b [file] [log] [blame]
/*
* 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
*
* 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 <linux/compiler.h>
#include <net.h>
#include "arp.h"
#include "bootp.h"
#include "tftp.h"
#ifdef CONFIG_CMD_RARP
#include "rarp.h"
#endif
#include "nfs.h"
#ifdef CONFIG_STATUS_LED
#include <status_led.h>
#include <miiphy.h>
#endif
#if defined(CONFIG_CMD_SNTP)
#include "sntp.h"
#endif
#include "cdp.h"
#if defined(CONFIG_CMD_DNS)
#include "dns.h"
#endif
#include "ping.h"
DECLARE_GLOBAL_DATA_PTR;
/** BOOTP EXTENTIONS **/
/* Our subnet mask (0=unknown) */
IPaddr_t NetOurSubnetMask;
/* Our gateways IP address */
IPaddr_t NetOurGatewayIP;
/* Our DNS IP address */
IPaddr_t NetOurDNSIP;
#if defined(CONFIG_BOOTP_DNS2)
/* Our 2nd DNS IP address */
IPaddr_t NetOurDNS2IP;
#endif
/* Our NIS domain */
char NetOurNISDomain[32] = {0,};
/* Our hostname */
char NetOurHostName[32] = {0,};
/* Our bootpath */
char NetOurRootPath[64] = {0,};
/* Our bootfile size in blocks */
ushort NetBootFileSize;
#ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */
IPaddr_t Mcast_addr;
#endif
/** END OF BOOTP EXTENTIONS **/
/* The actual transferred size of the bootfile (in bytes) */
ulong NetBootFileXferSize;
/* Our ethernet address */
uchar NetOurEther[6];
/* Boot server enet address */
uchar NetServerEther[6];
/* Our IP addr (0 = unknown) */
IPaddr_t NetOurIP;
/* Server IP addr (0 = unknown) */
IPaddr_t NetServerIP;
/* Current receive packet */
uchar *NetRxPacket;
/* Current rx packet length */
int NetRxPacketLen;
/* IP packet ID */
unsigned NetIPID;
/* Ethernet bcast address */
uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
uchar NetEtherNullAddr[6];
#ifdef CONFIG_API
void (*push_packet)(void *, int len) = 0;
#endif
/* Network loop state */
int NetState;
/* Tried all network devices */
int NetRestartWrap;
/* Network loop restarted */
static int NetRestarted;
/* At least one device configured */
static int NetDevExists;
/* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
/* default is without VLAN */
ushort NetOurVLAN = 0xFFFF;
/* ditto */
ushort NetOurNativeVLAN = 0xFFFF;
/* Boot File name */
char BootFile[128];
#if defined(CONFIG_CMD_SNTP)
/* NTP server IP address */
IPaddr_t NetNtpServerIP;
/* offset time from UTC */
int NetTimeOffset;
#endif
uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
/* Receive packet */
uchar *NetRxPackets[PKTBUFSRX];
/* Current RX packet handler */
static rxhand_f *packetHandler;
#ifdef CONFIG_CMD_TFTPPUT
static rxhand_icmp_f *packet_icmp_handler; /* Current ICMP rx handler */
#endif
/* Current timeout handler */
static thand_f *timeHandler;
/* Time base value */
static ulong timeStart;
/* Current timeout value */
static ulong timeDelta;
/* THE transmit packet */
uchar *NetTxPacket;
static int net_check_prereq(enum proto_t protocol);
static int NetTryCount;
/**********************************************************************/
/*
* Check if autoload is enabled. If so, use either NFS or TFTP to download
* the boot file.
*/
void net_auto_load(void)
{
const char *s = getenv("autoload");
if (s != NULL) {
if (*s == 'n') {
/*
* Just use BOOTP/RARP to configure system;
* Do not use TFTP to load the bootfile.
*/
NetState = NETLOOP_SUCCESS;
return;
}
#if defined(CONFIG_CMD_NFS)
if (strcmp(s, "NFS") == 0) {
/*
* Use NFS to load the bootfile.
*/
NfsStart();
return;
}
#endif
}
TftpStart(TFTPGET);
}
static void NetInitLoop(enum proto_t protocol)
{
static int env_changed_id;
int env_id = get_env_id();
/* update only when the environment has changed */
if (env_changed_id != env_id) {
NetOurIP = getenv_IPaddr("ipaddr");
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(enum proto_t protocol)
{
bd_t *bd = gd->bd;
int ret = -1;
NetRestarted = 0;
NetDevExists = 0;
NetTxPacket = NULL;
NetTryCount = 1;
ArpInit();
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;
}
bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
eth_halt();
eth_set_current();
if (eth_init(bd) < 0) {
eth_halt();
return -1;
}
restart:
memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
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;
case 2:
/* network device not configured */
break;
case 0:
NetDevExists = 1;
NetBootFileXferSize = 0;
switch (protocol) {
case TFTPGET:
#ifdef CONFIG_CMD_TFTPPUT
case TFTPPUT:
#endif
/* always use ARP to get server ethernet address */
TftpStart(protocol);
break;
#ifdef CONFIG_CMD_TFTPSRV
case TFTPSRV:
TftpStartServer();
break;
#endif
#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;
#if defined(CONFIG_CMD_RARP)
case RARP:
RarpTry = 0;
NetOurIP = 0;
RarpRequest();
break;
#endif
#if defined(CONFIG_CMD_PING)
case PING:
ping_start();
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;
}
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
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");
goto done;
}
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:
NetRestarted = 1;
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();
ret = NetBootFileXferSize;
goto done;
case NETLOOP_FAIL:
goto done;
}
}
done:
#ifdef CONFIG_CMD_TFTPPUT
/* Clear out the handlers */
NetSetHandler(NULL);
net_set_icmp_handler(NULL);
#endif
return ret;
}
/**********************************************************************/
static void
startAgainTimeout(void)
{
NetState = NETLOOP_RESTART;
}
static void
startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip,
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++;
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;
}
}
/**********************************************************************/
/*
* Miscelaneous bits.
*/
rxhand_f *
NetGetHandler(void)
{
return packetHandler;
}
void
NetSetHandler(rxhand_f *f)
{
packetHandler = f;
}
#ifdef CONFIG_CMD_TFTPPUT
void net_set_icmp_handler(rxhand_icmp_f *f)
{
packet_icmp_handler = f;
}
#endif
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(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 %08x\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 %08x/%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 */
}
#ifdef CONFIG_IP_DEFRAG
/*
* This function collects fragments in a single packet, according
* to the algorithm in RFC815. It returns NULL or the pointer to
* a complete packet, in static storage
*/
#ifndef CONFIG_NET_MAXDEFRAG
#define CONFIG_NET_MAXDEFRAG 16384
#endif
/*
* MAXDEFRAG, above, is chosen in the config file and is real data
* so we need to add the NFS overhead, which is more than TFTP.
* To use sizeof in the internal unnamed structures, we need a real
* instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
* The compiler doesn't complain nor allocates the actual structure
*/
static struct rpc_t rpc_specimen;
#define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
#define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)
/*
* this is the packet being assembled, either data or frag control.
* Fragments go by 8 bytes, so this union must be 8 bytes long
*/
struct hole {
/* first_byte is address of this structure */
u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */
u16 next_hole; /* index of next (in 8-b blocks), 0 == none */
u16 prev_hole; /* index of prev, 0 == none */
u16 unused;
};
static IP_t *__NetDefragment(IP_t *ip, int *lenp)
{
static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
static u16 first_hole, total_len;
struct hole *payload, *thisfrag, *h, *newh;
IP_t *localip = (IP_t *)pkt_buff;
uchar *indata = (uchar *)ip;
int offset8, start, len, done = 0;
u16 ip_off = ntohs(ip->ip_off);
/* payload starts after IP header, this fragment is in there */
payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP);
offset8 = (ip_off & IP_OFFS);
thisfrag = payload + offset8;
start = offset8 * 8;
len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
if (start + len > IP_MAXUDP) /* fragment extends too far */
return NULL;
if (!total_len || localip->ip_id != ip->ip_id) {
/* new (or different) packet, reset structs */
total_len = 0xffff;
payload[0].last_byte = ~0;
payload[0].next_hole = 0;
payload[0].prev_hole = 0;
first_hole = 0;
/* any IP header will work, copy the first we received */
memcpy(localip, ip, IP_HDR_SIZE_NO_UDP);
}
/*
* What follows is the reassembly algorithm. We use the payload
* array as a linked list of hole descriptors, as each hole starts
* at a multiple of 8 bytes. However, last byte can be whatever value,
* so it is represented as byte count, not as 8-byte blocks.
*/
h = payload + first_hole;
while (h->last_byte < start) {
if (!h->next_hole) {
/* no hole that far away */
return NULL;
}
h = payload + h->next_hole;
}
/* last fragment may be 1..7 bytes, the "+7" forces acceptance */
if (offset8 + ((len + 7) / 8) <= h - payload) {
/* no overlap with holes (dup fragment?) */
return NULL;
}
if (!(ip_off & IP_FLAGS_MFRAG)) {
/* no more fragmentss: truncate this (last) hole */
total_len = start + len;
h->last_byte = start + len;
}
/*
* There is some overlap: fix the hole list. This code doesn't
* deal with a fragment that overlaps with two different holes
* (thus being a superset of a previously-received fragment).
*/
if ((h >= thisfrag) && (h->last_byte <= start + len)) {
/* complete overlap with hole: remove hole */
if (!h->prev_hole && !h->next_hole) {
/* last remaining hole */
done = 1;
} else if (!h->prev_hole) {
/* first hole */
first_hole = h->next_hole;
payload[h->next_hole].prev_hole = 0;
} else if (!h->next_hole) {
/* last hole */
payload[h->prev_hole].next_hole = 0;
} else {
/* in the middle of the list */
payload[h->next_hole].prev_hole = h->prev_hole;
payload[h->prev_hole].next_hole = h->next_hole;
}
} else if (h->last_byte <= start + len) {
/* overlaps with final part of the hole: shorten this hole */
h->last_byte = start;
} else if (h >= thisfrag) {
/* overlaps with initial part of the hole: move this hole */
newh = thisfrag + (len / 8);
*newh = *h;
h = newh;
if (h->next_hole)
payload[h->next_hole].prev_hole = (h - payload);
if (h->prev_hole)
payload[h->prev_hole].next_hole = (h - payload);
else
first_hole = (h - payload);
} else {
/* fragment sits in the middle: split the hole */
newh = thisfrag + (len / 8);
*newh = *h;
h->last_byte = start;
h->next_hole = (newh - payload);
newh->prev_hole = (h - payload);
if (newh->next_hole)
payload[newh->next_hole].prev_hole = (newh - payload);
}
/* finally copy this fragment and possibly return whole packet */
memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len);
if (!done)
return NULL;
localip->ip_len = htons(total_len);
*lenp = total_len + IP_HDR_SIZE_NO_UDP;
return localip;
}
static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
{
u16 ip_off = ntohs(ip->ip_off);
if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
return ip; /* not a fragment */
return __NetDefragment(ip, lenp);
}
#else /* !CONFIG_IP_DEFRAG */
static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
{
u16 ip_off = ntohs(ip->ip_off);
if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
return ip; /* not a fragment */
return NULL;
}
#endif
/**
* Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
* drop others.
*
* @parma ip IP packet containing the ICMP
*/
static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et)
{
ICMP_t *icmph = (ICMP_t *)&ip->udp_src;
switch (icmph->type) {
case ICMP_REDIRECT:
if (icmph->code != ICMP_REDIR_HOST)
return;
printf(" ICMP Host Redirect to %pI4 ",
&icmph->un.gateway);
break;
default:
#if defined(CONFIG_CMD_PING)
ping_receive(et, ip, len);
#endif
#ifdef CONFIG_CMD_TFTPPUT
if (packet_icmp_handler)
packet_icmp_handler(icmph->type, icmph->code,
ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src),
icmph->un.data, ntohs(ip->udp_len));
#endif
break;
}
}
void
NetReceive(uchar *inpkt, int len)
{
Ethernet_t *et;
IP_t *ip;
#ifdef CONFIG_CMD_RARP
ARP_t *arp;
#endif
IPaddr_t tmp;
IPaddr_t src_ip;
int x;
#if defined(CONFIG_CMD_CDP)
int iscdp;
#endif
ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
debug("packet received\n");
NetRxPacket = inpkt;
NetRxPacketLen = len;
et = (Ethernet_t *)inpkt;
/* too small packet? */
if (len < ETHER_HDR_SIZE)
return;
#ifdef CONFIG_API
if (push_packet) {
(*push_packet)(inpkt, len);
return;
}
#endif
#if defined(CONFIG_CMD_CDP)
/* keep track if packet is CDP */
iscdp = is_cdp_packet(et->et_dest);
#endif
myvlanid = ntohs(NetOurVLAN);
if (myvlanid == (ushort)-1)
myvlanid = VLAN_NONE;
mynvlanid = ntohs(NetOurNativeVLAN);
if (mynvlanid == (ushort)-1)
mynvlanid = VLAN_NONE;
x = ntohs(et->et_protlen);
debug("packet received\n");
if (x < 1514) {
/*
* Got a 802 packet. Check the other protocol field.
*/
x = ntohs(et->et_prot);
ip = (IP_t *)(inpkt + E802_HDR_SIZE);
len -= E802_HDR_SIZE;
} else if (x != PROT_VLAN) { /* normal packet */
ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
len -= ETHER_HDR_SIZE;
} else { /* VLAN packet */
VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
debug("VLAN packet received\n");
/* too small packet? */
if (len < VLAN_ETHER_HDR_SIZE)
return;
/* if no VLAN active */
if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
#if defined(CONFIG_CMD_CDP)
&& iscdp == 0
#endif
)
return;
cti = ntohs(vet->vet_tag);
vlanid = cti & VLAN_IDMASK;
x = ntohs(vet->vet_type);
ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
len -= VLAN_ETHER_HDR_SIZE;
}
debug("Receive from protocol 0x%x\n", x);
#if defined(CONFIG_CMD_CDP)
if (iscdp) {
CDPHandler((uchar *)ip, len);
return;
}
#endif
if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
if (vlanid == VLAN_NONE)
vlanid = (mynvlanid & VLAN_IDMASK);
/* not matched? */
if (vlanid != (myvlanid & VLAN_IDMASK))
return;
}
switch (x) {
case PROT_ARP:
ArpReceive(et, ip, len);
break;
#ifdef CONFIG_CMD_RARP
case PROT_RARP:
debug("Got RARP\n");
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)) {
puts("invalid RARP header\n");
} else {
NetCopyIP(&NetOurIP, &arp->ar_data[16]);
if (NetServerIP == 0)
NetCopyIP(&NetServerIP, &arp->ar_data[6]);
memcpy(NetServerEther, &arp->ar_data[0], 6);
(*packetHandler)(0, 0, 0, 0, 0);
}
break;
#endif
case PROT_IP:
debug("Got IP\n");
/* Before we start poking the header, make sure it is there */
if (len < IP_HDR_SIZE) {
debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
return;
}
/* Check the packet length */
if (len < ntohs(ip->ip_len)) {
printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
return;
}
len = ntohs(ip->ip_len);
debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
/* Can't deal with anything except IPv4 */
if ((ip->ip_hl_v & 0xf0) != 0x40)
return;
/* Can't deal with IP options (headers != 20 bytes) */
if ((ip->ip_hl_v & 0x0f) > 0x05)
return;
/* Check the Checksum of the header */
if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
puts("checksum bad\n");
return;
}
/* If it is not for us, ignore it */
tmp = NetReadIP(&ip->ip_dst);
if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
#ifdef CONFIG_MCAST_TFTP
if (Mcast_addr != tmp)
#endif
return;
}
/* Read source IP address for later use */
src_ip = NetReadIP(&ip->ip_src);
/*
* The function returns the unchanged packet if it's not
* a fragment, and either the complete packet or NULL if
* it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
*/
ip = NetDefragment(ip, &len);
if (!ip)
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.
*
* Simon Glass <sjg@chromium.org>: We get an ICMP when
* we send a tftp packet to a dead connection, or when
* there is no server at the other end.
*/
if (ip->ip_p == IPPROTO_ICMP) {
receive_icmp(ip, len, src_ip, et);
return;
} else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
return;
}
#ifdef CONFIG_UDP_CHECKSUM
if (ip->udp_xsum != 0) {
ulong xsum;
ushort *sumptr;
ushort sumlen;
xsum = ip->ip_p;
xsum += (ntohs(ip->udp_len));
xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff;
xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff;
sumlen = ntohs(ip->udp_len);
sumptr = (ushort *) &(ip->udp_src);
while (sumlen > 1) {
ushort sumdata;
sumdata = *sumptr++;
xsum += ntohs(sumdata);
sumlen -= 2;
}
if (sumlen > 0) {
ushort sumdata;
sumdata = *(unsigned char *) sumptr;
sumdata = (sumdata << 8) & 0xff00;
xsum += sumdata;
}
while ((xsum >> 16) != 0) {
xsum = (xsum & 0x0000ffff) +
((xsum >> 16) & 0x0000ffff);
}
if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
printf(" UDP wrong checksum %08lx %08x\n",
xsum, ntohs(ip->udp_xsum));
return;
}
}
#endif
#ifdef CONFIG_NETCONSOLE
nc_input_packet((uchar *)ip + IP_HDR_SIZE,
ntohs(ip->udp_dst),
ntohs(ip->udp_src),
ntohs(ip->udp_len) - 8);
#endif
/*
* IP header OK. Pass the packet to the current handler.
*/
(*packetHandler)((uchar *)ip + IP_HDR_SIZE,
ntohs(ip->udp_dst),
src_ip,
ntohs(ip->udp_src),
ntohs(ip->udp_len) - 8);
break;
}
}
/**********************************************************************/
static int net_check_prereq(enum proto_t protocol)
{
switch (protocol) {
/* Fall through */
#if defined(CONFIG_CMD_PING)
case PING:
if (NetPingIP == 0) {
puts("*** ERROR: ping address not given\n");
return 1;
}
goto common;
#endif
#if defined(CONFIG_CMD_SNTP)
case SNTP:
if (NetNtpServerIP == 0) {
puts("*** ERROR: NTP server address not given\n");
return 1;
}
goto common;
#endif
#if defined(CONFIG_CMD_DNS)
case DNS:
if (NetOurDNSIP == 0) {
puts("*** ERROR: DNS server address not given\n");
return 1;
}
goto common;
#endif
#if defined(CONFIG_CMD_NFS)
case NFS:
#endif
case TFTPGET:
case TFTPPUT:
if (NetServerIP == 0) {
puts("*** ERROR: `serverip' not set\n");
return 1;
}
#if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
defined(CONFIG_CMD_DNS)
common:
#endif
/* Fall through */
case NETCONS:
case TFTPSRV:
if (NetOurIP == 0) {
puts("*** ERROR: `ipaddr' not set\n");
return 1;
}
/* Fall through */
#ifdef CONFIG_CMD_RARP
case RARP:
#endif
case BOOTP:
case CDP:
case DHCP:
if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
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;
}
/* Fall through */
default:
return 0;
}
return 0; /* OK */
}
/**********************************************************************/
int
NetCksumOk(uchar *ptr, int len)
{
return !((NetCksum(ptr, len) + 1) & 0xfffe);
}
unsigned
NetCksum(uchar *ptr, int len)
{
ulong xsum;
ushort *p = (ushort *)ptr;
xsum = 0;
while (len-- > 0)
xsum += *p++;
xsum = (xsum & 0xffff) + (xsum >> 16);
xsum = (xsum & 0xffff) + (xsum >> 16);
return xsum & 0xffff;
}
int
NetEthHdrSize(void)
{
ushort myvlanid;
myvlanid = ntohs(NetOurVLAN);
if (myvlanid == (ushort)-1)
myvlanid = VLAN_NONE;
return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
VLAN_ETHER_HDR_SIZE;
}
int
NetSetEther(uchar *xet, uchar * addr, uint prot)
{
Ethernet_t *et = (Ethernet_t *)xet;
ushort myvlanid;
myvlanid = ntohs(NetOurVLAN);
if (myvlanid == (ushort)-1)
myvlanid = VLAN_NONE;
memcpy(et->et_dest, addr, 6);
memcpy(et->et_src, NetOurEther, 6);
if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
et->et_protlen = htons(prot);
return ETHER_HDR_SIZE;
} else {
VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
vet->vet_vlan_type = htons(PROT_VLAN);
vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
vet->vet_type = htons(prot);
return VLAN_ETHER_HDR_SIZE;
}
}
void
NetSetIP(uchar *xip, IPaddr_t dest, int dport, int sport, int len)
{
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_HDR_SIZE / 4 (not including UDP) */
ip->ip_hl_v = 0x45;
ip->ip_tos = 0;
ip->ip_len = htons(IP_HDR_SIZE + len);
ip->ip_id = htons(NetIPID++);
ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
ip->ip_ttl = 255;
ip->ip_p = 17; /* UDP */
ip->ip_sum = 0;
/* already in network byte order */
NetCopyIP((void *)&ip->ip_src, &NetOurIP);
/* - "" - */
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(char *dst, const char *src, int size)
{
if (*src && (*src == '"')) {
++src;
--size;
}
while ((--size > 0) && *src && (*src != '"'))
*dst++ = *src++;
*dst = '\0';
}
#if defined(CONFIG_CMD_NFS) || \
defined(CONFIG_CMD_SNTP) || \
defined(CONFIG_CMD_DNS)
/*
* make port a little random (1024-17407)
* This keeps the math somewhat trivial to compute, and seems to work with
* all supported protocols/clients/servers
*/
unsigned int random_port(void)
{
return 1024 + (get_timer(0) % 0x4000);
}
#endif
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 VLAN_to_string(ushort x, char *s)
{
x = ntohs(x);
if (x == (ushort)-1)
x = VLAN_NONE;
if (x == VLAN_NONE)
strcpy(s, "none");
else
sprintf(s, "%d", x & VLAN_IDMASK);
}
ushort string_to_VLAN(const char *s)
{
ushort id;
if (s == NULL)
return htons(VLAN_NONE);
if (*s < '0' || *s > '9')
id = VLAN_NONE;
else
id = (ushort)simple_strtoul(s, NULL, 10);
return htons(id);
}
ushort getenv_VLAN(char *var)
{
return string_to_VLAN(getenv(var));
}