--- /dev/null
+/*
+ * 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
+ *
+ * LINK_LOCAL:
+ *
+ * Prerequisites: - own ethernet address
+ * We want: - own IP address
+ * 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 <command.h>
+#include <environment.h>
+#include <net.h>
+#if defined(CONFIG_STATUS_LED)
+#include <miiphy.h>
+#include <status_led.h>
+#endif
+#include <watchdog.h>
+#include <linux/compiler.h>
+#include "arp.h"
+#include "bootp.h"
+#include "cdp.h"
+#if defined(CONFIG_CMD_DNS)
+#include "dns.h"
+#endif
+#include "link_local.h"
+#include "nfs.h"
+#include "ping.h"
+#include "rarp.h"
+#if defined(CONFIG_CMD_SNTP)
+#include "sntp.h"
+#endif
+#include "tftp.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 */
+enum net_loop_state net_state;
+/* 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
+
+static uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
+
+/* Receive packet */
+uchar *NetRxPackets[PKTBUFSRX];
+
+/* Current UDP RX packet handler */
+static rxhand_f *udp_packet_handler;
+/* Current ARP RX packet handler */
+static rxhand_f *arp_packet_handler;
+#ifdef CONFIG_CMD_TFTPPUT
+/* Current ICMP rx handler */
+static rxhand_icmp_f *packet_icmp_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;
+
+int __maybe_unused net_busy_flag;
+
+/**********************************************************************/
+
+static int on_bootfile(const char *name, const char *value, enum env_op op,
+ int flags)
+{
+ switch (op) {
+ case env_op_create:
+ case env_op_overwrite:
+ copy_filename(BootFile, value, sizeof(BootFile));
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+U_BOOT_ENV_CALLBACK(bootfile, on_bootfile);
+
+/*
+ * Check if autoload is enabled. If so, use either NFS or TFTP to download
+ * the boot file.
+ */
+void net_auto_load(void)
+{
+#if defined(CONFIG_CMD_NFS)
+ const char *s = getenv("autoload");
+
+ if (s != NULL && strcmp(s, "NFS") == 0) {
+ /*
+ * Use NFS to load the bootfile.
+ */
+ NfsStart();
+ return;
+ }
+#endif
+ if (getenv_yesno("autoload") == 0) {
+ /*
+ * Just use BOOTP/RARP to configure system;
+ * Do not use TFTP to load the bootfile.
+ */
+ net_set_state(NETLOOP_SUCCESS);
+ return;
+ }
+ TftpStart(TFTPGET);
+}
+
+static void NetInitLoop(void)
+{
+ 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;
+ }
+ if (eth_get_dev())
+ memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
+
+ return;
+}
+
+static void net_clear_handlers(void)
+{
+ net_set_udp_handler(NULL);
+ net_set_arp_handler(NULL);
+ NetSetTimeout(0, NULL);
+}
+
+static void net_cleanup_loop(void)
+{
+ net_clear_handlers();
+}
+
+void net_init(void)
+{
+ static int first_call = 1;
+
+ if (first_call) {
+ /*
+ * Setup packet buffers, aligned correctly.
+ */
+ int i;
+
+ NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
+ NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
+ for (i = 0; i < PKTBUFSRX; i++)
+ NetRxPackets[i] = NetTxPacket + (i + 1) * PKTSIZE_ALIGN;
+
+ ArpInit();
+ net_clear_handlers();
+
+ /* Only need to setup buffer pointers once. */
+ first_call = 0;
+ }
+
+ NetInitLoop();
+}
+
+/**********************************************************************/
+/*
+ * Main network processing loop.
+ */
+
+int NetLoop(enum proto_t protocol)
+{
+ bd_t *bd = gd->bd;
+ int ret = -1;
+
+ NetRestarted = 0;
+ NetDevExists = 0;
+ NetTryCount = 1;
+ debug_cond(DEBUG_INT_STATE, "--- NetLoop Entry\n");
+
+ bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
+ net_init();
+ if (eth_is_on_demand_init() || protocol != NETCONS) {
+ eth_halt();
+ eth_set_current();
+ if (eth_init(bd) < 0) {
+ eth_halt();
+ return -1;
+ }
+ } else
+ eth_init_state_only(bd);
+
+restart:
+#ifdef CONFIG_USB_KEYBOARD
+ net_busy_flag = 0;
+#endif
+ net_set_state(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.
+ */
+ debug_cond(DEBUG_INT_STATE, "--- NetLoop Init\n");
+ NetInitLoop();
+
+ 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
+#if defined(CONFIG_CMD_LINK_LOCAL)
+ case LINKLOCAL:
+ link_local_start();
+ 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, ... */
+#ifdef CONFIG_USB_KEYBOARD
+ net_busy_flag = 1;
+#endif
+
+ /*
+ * Main packet reception loop. Loop receiving packets until
+ * someone sets `net_state' 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()) {
+ /* cancel any ARP that may not have completed */
+ NetArpWaitPacketIP = 0;
+
+ net_cleanup_loop();
+ eth_halt();
+ /* Invalidate the last protocol */
+ eth_set_last_protocol(BOOTP);
+
+ puts("\nAbort\n");
+ /* include a debug print as well incase the debug
+ messages are directed to stderr */
+ debug_cond(DEBUG_INT_STATE, "--- NetLoop Abort!\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, ... */
+ debug_cond(DEBUG_INT_STATE, "--- NetLoop timeout\n");
+ x = timeHandler;
+ timeHandler = (thand_f *)0;
+ (*x)();
+ }
+
+
+ switch (net_state) {
+
+ case NETLOOP_RESTART:
+ NetRestarted = 1;
+ goto restart;
+
+ case NETLOOP_SUCCESS:
+ net_cleanup_loop();
+ if (NetBootFileXferSize > 0) {
+ printf("Bytes transferred = %ld (%lx hex)\n",
+ NetBootFileXferSize,
+ NetBootFileXferSize);
+ setenv_hex("filesize", NetBootFileXferSize);
+ setenv_hex("fileaddr", load_addr);
+ }
+ if (protocol != NETCONS)
+ eth_halt();
+ else
+ eth_halt_state_only();
+
+ eth_set_last_protocol(protocol);
+
+ ret = NetBootFileXferSize;
+ debug_cond(DEBUG_INT_STATE, "--- NetLoop Success!\n");
+ goto done;
+
+ case NETLOOP_FAIL:
+ net_cleanup_loop();
+ /* Invalidate the last protocol */
+ eth_set_last_protocol(BOOTP);
+ debug_cond(DEBUG_INT_STATE, "--- NetLoop Fail!\n");
+ goto done;
+
+ case NETLOOP_CONTINUE:
+ continue;
+ }
+ }
+
+done:
+#ifdef CONFIG_USB_KEYBOARD
+ net_busy_flag = 0;
+#endif
+#ifdef CONFIG_CMD_TFTPPUT
+ /* Clear out the handlers */
+ net_set_udp_handler(NULL);
+ net_set_icmp_handler(NULL);
+#endif
+ return ret;
+}
+
+/**********************************************************************/
+
+static void
+startAgainTimeout(void)
+{
+ net_set_state(NETLOOP_RESTART);
+}
+
+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();
+ net_set_state(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);
+ net_set_udp_handler(NULL);
+ } else {
+ net_set_state(NETLOOP_FAIL);
+ }
+ } else {
+ net_set_state(NETLOOP_RESTART);
+ }
+}
+
+/**********************************************************************/
+/*
+ * Miscelaneous bits.
+ */
+
+static void dummy_handler(uchar *pkt, unsigned dport,
+ IPaddr_t sip, unsigned sport,
+ unsigned len)
+{
+}
+
+rxhand_f *net_get_udp_handler(void)
+{
+ return udp_packet_handler;
+}
+
+void net_set_udp_handler(rxhand_f *f)
+{
+ debug_cond(DEBUG_INT_STATE, "--- NetLoop UDP handler set (%p)\n", f);
+ if (f == NULL)
+ udp_packet_handler = dummy_handler;
+ else
+ udp_packet_handler = f;
+}
+
+rxhand_f *net_get_arp_handler(void)
+{
+ return arp_packet_handler;
+}
+
+void net_set_arp_handler(rxhand_f *f)
+{
+ debug_cond(DEBUG_INT_STATE, "--- NetLoop ARP handler set (%p)\n", f);
+ if (f == NULL)
+ arp_packet_handler = dummy_handler;
+ else
+ arp_packet_handler = 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) {
+ debug_cond(DEBUG_INT_STATE,
+ "--- NetLoop timeout handler cancelled\n");
+ timeHandler = (thand_f *)0;
+ } else {
+ debug_cond(DEBUG_INT_STATE,
+ "--- NetLoop timeout handler set (%p)\n", f);
+ timeHandler = f;
+ timeStart = get_timer(0);
+ timeDelta = iv * CONFIG_SYS_HZ / 1000;
+ }
+}
+
+int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport,
+ int payload_len)
+{
+ uchar *pkt;
+ int eth_hdr_size;
+ int pkt_hdr_size;
+
+ /* make sure the NetTxPacket is initialized (NetInit() was called) */
+ assert(NetTxPacket != NULL);
+ if (NetTxPacket == NULL)
+ return -1;
+
+ /* 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;
+
+ pkt = (uchar *)NetTxPacket;
+
+ eth_hdr_size = NetSetEther(pkt, ether, PROT_IP);
+ pkt += eth_hdr_size;
+ net_set_udp_header(pkt, dest, dport, sport, payload_len);
+ pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
+
+ /* if MAC address was not discovered yet, do an ARP request */
+ if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
+ debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
+
+ /* save the ip and eth addr for the packet to send after arp */
+ NetArpWaitPacketIP = dest;
+ NetArpWaitPacketMAC = ether;
+
+ /* size of the waiting packet */
+ NetArpWaitTxPacketSize = pkt_hdr_size + payload_len;
+
+ /* and do the ARP request */
+ NetArpWaitTry = 1;
+ NetArpWaitTimerStart = get_timer(0);
+ ArpRequest();
+ return 1; /* waiting */
+ } else {
+ debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
+ &dest, ether);
+ NetSendPacket(NetTxPacket, pkt_hdr_size + payload_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)
+
+/*
+ * 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 struct ip_udp_hdr *__NetDefragment(struct ip_udp_hdr *ip, int *lenp)
+{
+ static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
+ static u16 first_hole, total_len;
+ struct hole *payload, *thisfrag, *h, *newh;
+ struct ip_udp_hdr *localip = (struct ip_udp_hdr *)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);
+ offset8 = (ip_off & IP_OFFS);
+ thisfrag = payload + offset8;
+ start = offset8 * 8;
+ len = ntohs(ip->ip_len) - IP_HDR_SIZE;
+
+ 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);
+ }
+
+ /*
+ * 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, len);
+ if (!done)
+ return NULL;
+
+ localip->ip_len = htons(total_len);
+ *lenp = total_len + IP_HDR_SIZE;
+ return localip;
+}
+
+static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *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 struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *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(struct ip_udp_hdr *ip, int len,
+ IPaddr_t src_ip, struct ethernet_hdr *et)
+{
+ struct icmp_hdr *icmph = (struct icmp_hdr *)&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)
+{
+ struct ethernet_hdr *et;
+ struct ip_udp_hdr *ip;
+ IPaddr_t dst_ip;
+ IPaddr_t src_ip;
+ int eth_proto;
+#if defined(CONFIG_CMD_CDP)
+ int iscdp;
+#endif
+ ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
+
+ debug_cond(DEBUG_NET_PKT, "packet received\n");
+
+ NetRxPacket = inpkt;
+ NetRxPacketLen = len;
+ et = (struct ethernet_hdr *)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;
+
+ eth_proto = ntohs(et->et_protlen);
+
+ if (eth_proto < 1514) {
+ struct e802_hdr *et802 = (struct e802_hdr *)et;
+ /*
+ * Got a 802.2 packet. Check the other protocol field.
+ * XXX VLAN over 802.2+SNAP not implemented!
+ */
+ eth_proto = ntohs(et802->et_prot);
+
+ ip = (struct ip_udp_hdr *)(inpkt + E802_HDR_SIZE);
+ len -= E802_HDR_SIZE;
+
+ } else if (eth_proto != PROT_VLAN) { /* normal packet */
+ ip = (struct ip_udp_hdr *)(inpkt + ETHER_HDR_SIZE);
+ len -= ETHER_HDR_SIZE;
+
+ } else { /* VLAN packet */
+ struct vlan_ethernet_hdr *vet =
+ (struct vlan_ethernet_hdr *)et;
+
+ debug_cond(DEBUG_NET_PKT, "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;
+ eth_proto = ntohs(vet->vet_type);
+
+ ip = (struct ip_udp_hdr *)(inpkt + VLAN_ETHER_HDR_SIZE);
+ len -= VLAN_ETHER_HDR_SIZE;
+ }
+
+ debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
+
+#if defined(CONFIG_CMD_CDP)
+ if (iscdp) {
+ cdp_receive((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 (eth_proto) {
+
+ case PROT_ARP:
+ ArpReceive(et, ip, len);
+ break;
+
+#ifdef CONFIG_CMD_RARP
+ case PROT_RARP:
+ rarp_receive(ip, len);
+ break;
+#endif
+ case PROT_IP:
+ debug_cond(DEBUG_NET_PKT, "Got IP\n");
+ /* Before we start poking the header, make sure it is there */
+ if (len < IP_UDP_HDR_SIZE) {
+ debug("len bad %d < %lu\n", len,
+ (ulong)IP_UDP_HDR_SIZE);
+ return;
+ }
+ /* Check the packet length */
+ if (len < ntohs(ip->ip_len)) {
+ debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
+ return;
+ }
+ len = ntohs(ip->ip_len);
+ debug_cond(DEBUG_NET_PKT, "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 / 2)) {
+ debug("checksum bad\n");
+ return;
+ }
+ /* If it is not for us, ignore it */
+ dst_ip = NetReadIP(&ip->ip_dst);
+ if (NetOurIP && dst_ip != NetOurIP && dst_ip != 0xFFFFFFFF) {
+#ifdef CONFIG_MCAST_TFTP
+ if (Mcast_addr != dst_ip)
+#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;
+ }
+
+ debug_cond(DEBUG_DEV_PKT,
+ "received UDP (to=%pI4, from=%pI4, len=%d)\n",
+ &dst_ip, &src_ip, len);
+
+#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_UDP_HDR_SIZE,
+ src_ip,
+ ntohs(ip->udp_dst),
+ ntohs(ip->udp_src),
+ ntohs(ip->udp_len) - UDP_HDR_SIZE);
+#endif
+ /*
+ * IP header OK. Pass the packet to the current handler.
+ */
+ (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
+ ntohs(ip->udp_dst),
+ src_ip,
+ ntohs(ip->udp_src),
+ ntohs(ip->udp_len) - UDP_HDR_SIZE);
+ 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:
+ case LINKLOCAL:
+ 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)
+{
+ struct ethernet_hdr *et = (struct ethernet_hdr *)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 {
+ struct vlan_ethernet_hdr *vet =
+ (struct vlan_ethernet_hdr *)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;
+ }
+}
+
+int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
+{
+ ushort protlen;
+
+ memcpy(et->et_dest, addr, 6);
+ memcpy(et->et_src, NetOurEther, 6);
+ protlen = ntohs(et->et_protlen);
+ if (protlen == PROT_VLAN) {
+ struct vlan_ethernet_hdr *vet =
+ (struct vlan_ethernet_hdr *)et;
+ vet->vet_type = htons(prot);
+ return VLAN_ETHER_HDR_SIZE;
+ } else if (protlen > 1514) {
+ et->et_protlen = htons(prot);
+ return ETHER_HDR_SIZE;
+ } else {
+ /* 802.2 + SNAP */
+ struct e802_hdr *et802 = (struct e802_hdr *)et;
+ et802->et_prot = htons(prot);
+ return E802_HDR_SIZE;
+ }
+}
+
+void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source)
+{
+ struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
+
+ /*
+ * Construct an IP header.
+ */
+ /* IP_HDR_SIZE / 4 (not including UDP) */
+ ip->ip_hl_v = 0x45;
+ ip->ip_tos = 0;
+ ip->ip_len = htons(IP_HDR_SIZE);
+ ip->ip_id = htons(NetIPID++);
+ ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
+ ip->ip_ttl = 255;
+ ip->ip_sum = 0;
+ /* already in network byte order */
+ NetCopyIP((void *)&ip->ip_src, &source);
+ /* already in network byte order */
+ NetCopyIP((void *)&ip->ip_dst, &dest);
+}
+
+void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport, int sport,
+ int len)
+{
+ struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
+
+ /*
+ * 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)
+ pkt[IP_UDP_HDR_SIZE + len] = 0;
+
+ net_set_ip_header(pkt, dest, NetOurIP);
+ ip->ip_len = htons(IP_UDP_HDR_SIZE + len);
+ ip->ip_p = IPPROTO_UDP;
+ ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE >> 1);
+
+ ip->udp_src = htons(sport);
+ ip->udp_dst = htons(dport);
+ ip->udp_len = htons(UDP_HDR_SIZE + len);
+ ip->udp_xsum = 0;
+}
+
+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));
+}
Code Review / kvmfornfv.git / blobdiff