diff options
Diffstat (limited to 'u-boot/net/net.c')
| -rw-r--r-- | u-boot/net/net.c | 1934 |
1 files changed, 1934 insertions, 0 deletions
diff --git a/u-boot/net/net.c b/u-boot/net/net.c new file mode 100644 index 0000000..a609632 --- /dev/null +++ b/u-boot/net/net.c @@ -0,0 +1,1934 @@ +/* + * 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 <net.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 +#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; + +#if defined(CONFIG_CMD_RARP) + case RARP: + RarpTry = 0; + NetOurIP = 0; + RarpRequest (); + break; +#endif +#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; + ushort vlan, nvlan; + + /* minimum size? */ + if (len < sizeof(CDP_SNAP_hdr) + 4) + goto pkt_short; + + /* check for valid CDP SNAP header */ + if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0) + return; + + pkt += sizeof(CDP_SNAP_hdr); + len -= sizeof(CDP_SNAP_hdr); + + /* Version of CDP protocol must be >= 2 and TTL != 0 */ + if (pkt[0] < 0x02 || pkt[1] == 0) + return; + + /* if version is greater than 0x02 maybe we'll have a problem; output a warning */ + if (pkt[0] != 0x02) + printf("** WARNING: CDP packet received with a protocol version %d > 2\n", + pkt[0] & 0xff); + + if (CDP_compute_csum(pkt, len) != 0) + return; + + pkt += 4; + len -= 4; + + vlan = htons(-1); + nvlan = htons(-1); + while (len > 0) { + if (len < 4) + goto pkt_short; + + ss = (const ushort *)pkt; + type = ntohs(ss[0]); + tlen = ntohs(ss[1]); + if (tlen > len) { + goto pkt_short; + } + + pkt += tlen; + len -= tlen; + + ss += 2; /* point ss to the data of the TLV */ + tlen -= 4; + + switch (type) { + case CDP_DEVICE_ID_TLV: + break; + case CDP_ADDRESS_TLV: + break; + case CDP_PORT_ID_TLV: + break; + case CDP_CAPABILITIES_TLV: + break; + case CDP_VERSION_TLV: + break; + case CDP_PLATFORM_TLV: + break; + case CDP_NATIVE_VLAN_TLV: + nvlan = *ss; + break; + case CDP_APPLIANCE_VLAN_TLV: + t = (const uchar *)ss; + while (tlen > 0) { + if (tlen < 3) + goto pkt_short; + + applid = t[0]; + ss = (const ushort *)(t + 1); + +#ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE + if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE) + vlan = *ss; +#else + vlan = ntohs(*ss); /* XXX will this work; dunno */ +#endif + t += 3; tlen -= 3; + } + break; + case CDP_TRIGGER_TLV: + break; + case CDP_POWER_CONSUMPTION_TLV: + break; + case CDP_SYSNAME_TLV: + break; + case CDP_SYSOBJECT_TLV: + break; + case CDP_MANAGEMENT_ADDRESS_TLV: + break; + } + } + + CDPApplianceVLAN = vlan; + CDPNativeVLAN = nvlan; + + CDPOK = 1; + return; + + pkt_short: + printf("** CDP packet is too short\n"); + return; +} + +static void CDPStart(void) +{ +#if defined(CONFIG_NET_MULTI) + printf ("Using %s device\n", eth_get_name()); +#endif + CDPSeq = 0; + CDPOK = 0; + + CDPNativeVLAN = htons(-1); + CDPApplianceVLAN = htons(-1); + + NetSetTimeout (CDP_TIMEOUT, CDPTimeout); + NetSetHandler (CDPDummyHandler); + + CDPSendTrigger(); +} +#endif + +#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] __attribute__((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 + +void +NetReceive(volatile uchar * inpkt, int len) +{ + Ethernet_t *et; + IP_t *ip; + ARP_t *arp; + IPaddr_t tmp; + int x; + uchar *pkt; +#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 = memcmp(et->et_dest, NetCDPAddr, 6) == 0; +#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: + /* + * 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 + */ + debug("Got ARP\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_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 */ + debug("Got ARP REQUEST, return our IP\n"); + pkt = (uchar *)et; + pkt += NetSetEther(pkt, 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); + (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE); + return; + + case ARPOP_REPLY: /* arp reply */ + /* are we waiting for a reply */ + if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC) + break; + +#ifdef CONFIG_KEEP_SERVERADDR + if (NetServerIP == NetArpWaitPacketIP) { + char buf[20]; + sprintf(buf, "%pM", arp->ar_data); + setenv("serveraddr", buf); + } +#endif + + debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n", + arp->ar_data); + + tmp = NetReadIP(&arp->ar_data[6]); + + /* matched waiting packet's address */ + if (tmp == NetArpWaitReplyIP) { + debug("Got it\n"); + /* save address for later use */ + memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6); + +#ifdef CONFIG_NETCONSOLE + (*packetHandler)(0,0,0,0); +#endif + /* modify header, and transmit it */ + memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6); + (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize); + + /* no arp request pending now */ + NetArpWaitPacketIP = 0; + NetArpWaitTxPacketSize = 0; + NetArpWaitPacketMAC = NULL; + + } + return; + default: + debug("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op)); + return; + } + 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); + } + 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; + } + /* + * 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) + */ + if (!(ip = NetDefragment(ip, &len))) + 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); + + switch (icmph->type) { + case ICMP_REDIRECT: + if (icmph->code != ICMP_REDIR_HOST) + return; + printf (" ICMP Host Redirect to %pI4 ", &icmph->un.gateway); + return; +#if defined(CONFIG_CMD_PING) + case ICMP_ECHO_REPLY: + /* + * IP header OK. Pass the packet to the current handler. + */ + /* XXX point to ip packet */ + (*packetHandler)((uchar *)ip, 0, 0, 0); + return; + case ICMP_ECHO_REQUEST: + debug("Got ICMP ECHO REQUEST, return %d bytes \n", + ETHER_HDR_SIZE + len); + + memcpy (&et->et_dest[0], &et->et_src[0], 6); + memcpy (&et->et_src[ 0], NetOurEther, 6); + + ip->ip_sum = 0; + ip->ip_off = 0; + NetCopyIP((void*)&ip->ip_dst, &ip->ip_src); + NetCopyIP((void*)&ip->ip_src, &NetOurIP); + ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1); + + icmph->type = ICMP_ECHO_REPLY; + icmph->checksum = 0; + icmph->checksum = ~NetCksum((uchar *)icmph, + (len - IP_HDR_SIZE_NO_UDP) >> 1); + (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len); + return; +#endif + default: + 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), + ntohs(ip->udp_src), + ntohs(ip->udp_len) - 8); + break; + } +} + + +/**********************************************************************/ + +static int net_check_prereq (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 NETCONS: + case TFTP: + if (NetServerIP == 0) { + puts ("*** ERROR: `serverip' not set\n"); + return (1); + } +#if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) + common: +#endif + + 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) { +#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 */ + 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(volatile 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(volatile 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->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(IP_FLAGS_DFRAG); /* Don't fragment */ + 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 (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))); +} |