/*
 * Copyright 1994, 1995, 2000 Neil Russell.
 * (See License)
 * Copyright 2000, 2001 DENX Software Engineering, Wolfgang Denk, wd@denx.de
 * Copyright 2011 Comelit Group SpA,
 *                Luca Ceresoli <luca.ceresoli@comelit.it>
 */

#include <common.h>
#include <command.h>
#include <efi_loader.h>
#include <mapmem.h>
#include <net.h>
#include <net/tftp.h>
#include "bootp.h"
#ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
#include <flash.h>
#endif

/* Well known TFTP port # */
#define WELL_KNOWN_PORT 69
/* Millisecs to timeout for lost pkt */
#define TIMEOUT         5000UL
#ifndef CONFIG_NET_RETRY_COUNT
/* # of timeouts before giving up */
# define TIMEOUT_COUNT  10
#else
# define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT * 2)
#endif
/* Number of "loading" hashes per line (for checking the image size) */
#define HASHES_PER_LINE 65

/*
 *      TFTP operations.
 */
#define TFTP_RRQ        1
#define TFTP_WRQ        2
#define TFTP_DATA       3
#define TFTP_ACK        4
#define TFTP_ERROR      5
#define TFTP_OACK       6

static ulong timeout_ms = TIMEOUT;
static int timeout_count_max = TIMEOUT_COUNT;
static ulong time_start;   /* Record time we started tftp */

/*
 * These globals govern the timeout behavior when attempting a connection to a
 * TFTP server. tftp_timeout_ms specifies the number of milliseconds to
 * wait for the server to respond to initial connection. Second global,
 * tftp_timeout_count_max, gives the number of such connection retries.
 * tftp_timeout_count_max must be non-negative and tftp_timeout_ms must be
 * positive. The globals are meant to be set (and restored) by code needing
 * non-standard timeout behavior when initiating a TFTP transfer.
 */
ulong tftp_timeout_ms = TIMEOUT;
int tftp_timeout_count_max = TIMEOUT_COUNT;

enum {
        TFTP_ERR_UNDEFINED           = 0,
        TFTP_ERR_FILE_NOT_FOUND      = 1,
        TFTP_ERR_ACCESS_DENIED       = 2,
        TFTP_ERR_DISK_FULL           = 3,
        TFTP_ERR_UNEXPECTED_OPCODE   = 4,
        TFTP_ERR_UNKNOWN_TRANSFER_ID  = 5,
        TFTP_ERR_FILE_ALREADY_EXISTS = 6,
};

static struct in_addr tftp_remote_ip;
/* The UDP port at their end */
static int      tftp_remote_port;
/* The UDP port at our end */
static int      tftp_our_port;
static int      timeout_count;
/* packet sequence number */
static ulong    tftp_cur_block;
/* last packet sequence number received */
static ulong    tftp_prev_block;
/* count of sequence number wraparounds */
static ulong    tftp_block_wrap;
/* memory offset due to wrapping */
static ulong    tftp_block_wrap_offset;
static int      tftp_state;
#ifdef CONFIG_TFTP_TSIZE
/* The file size reported by the server */
static int      tftp_tsize;
/* The number of hashes we printed */
static short    tftp_tsize_num_hash;
#endif
#ifdef CONFIG_CMD_TFTPPUT
/* 1 if writing, else 0 */
static int      tftp_put_active;
/* 1 if we have sent the last block */
static int      tftp_put_final_block_sent;
#else
#define tftp_put_active 0
#endif

#define STATE_SEND_RRQ  1
#define STATE_DATA      2
#define STATE_TOO_LARGE 3
#define STATE_BAD_MAGIC 4
#define STATE_OACK      5
#define STATE_RECV_WRQ  6
#define STATE_SEND_WRQ  7

/* default TFTP block size */
#define TFTP_BLOCK_SIZE         512
/* sequence number is 16 bit */
#define TFTP_SEQUENCE_SIZE      ((ulong)(1<<16))

#define DEFAULT_NAME_LEN        (8 + 4 + 1)
static char default_filename[DEFAULT_NAME_LEN];

#ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
#define MAX_LEN 128
#else
#define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
#endif

static char tftp_filename[MAX_LEN];

/* 512 is poor choice for ethernet, MTU is typically 1500.
 * Minus eth.hdrs thats 1468.  Can get 2x better throughput with
 * almost-MTU block sizes.  At least try... fall back to 512 if need be.
 * (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
 */
#ifdef CONFIG_TFTP_BLOCKSIZE
#define TFTP_MTU_BLOCKSIZE CONFIG_TFTP_BLOCKSIZE
#else
#define TFTP_MTU_BLOCKSIZE 1468
#endif

static unsigned short tftp_block_size = TFTP_BLOCK_SIZE;
static unsigned short tftp_block_size_option = TFTP_MTU_BLOCKSIZE;

#ifdef CONFIG_MCAST_TFTP
#include <malloc.h>
#define MTFTP_BITMAPSIZE        0x1000
static unsigned *tftp_mcast_bitmap;
static int tftp_mcast_prev_hole;
static int tftp_mcast_bitmap_size = MTFTP_BITMAPSIZE;
static int tftp_mcast_disabled;
static int tftp_mcast_master_client;
static int tftp_mcast_active;
static int tftp_mcast_port;
/* can get 'last' block before done..*/
static ulong tftp_mcast_ending_block;

static void parse_multicast_oack(char *pkt, int len);

static void mcast_cleanup(void)
{
        if (net_mcast_addr)
                eth_mcast_join(net_mcast_addr, 0);
        if (tftp_mcast_bitmap)
                free(tftp_mcast_bitmap);
        tftp_mcast_bitmap = NULL;
        net_mcast_addr.s_addr = 0;
        tftp_mcast_active = 0;
        tftp_mcast_port = 0;
        tftp_mcast_ending_block = -1;
}

#endif  /* CONFIG_MCAST_TFTP */

static inline void store_block(int block, uchar *src, unsigned len)
{
        ulong offset = block * tftp_block_size + tftp_block_wrap_offset;
        ulong newsize = offset + len;
#ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
        int i, rc = 0;

        for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
                /* start address in flash? */
                if (flash_info[i].flash_id == FLASH_UNKNOWN)
                        continue;
                if (load_addr + offset >= flash_info[i].start[0]) {
                        rc = 1;
                        break;
                }
        }

        if (rc) { /* Flash is destination for this packet */
                rc = flash_write((char *)src, (ulong)(load_addr+offset), len);
                if (rc) {
                        flash_perror(rc);
                        net_set_state(NETLOOP_FAIL);
                        return;
                }
        } else
#endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
        {
                void *ptr = map_sysmem(load_addr + offset, len);

                memcpy(ptr, src, len);
                unmap_sysmem(ptr);
        }
#ifdef CONFIG_MCAST_TFTP
        if (tftp_mcast_active)
                ext2_set_bit(block, tftp_mcast_bitmap);
#endif

        if (net_boot_file_size < newsize)
                net_boot_file_size = newsize;
}

/* Clear our state ready for a new transfer */
static void new_transfer(void)
{
        tftp_prev_block = 0;
        tftp_block_wrap = 0;
        tftp_block_wrap_offset = 0;
#ifdef CONFIG_CMD_TFTPPUT
        tftp_put_final_block_sent = 0;
#endif
}

#ifdef CONFIG_CMD_TFTPPUT
/**
 * Load the next block from memory to be sent over tftp.
 *
 * @param block Block number to send
 * @param dst   Destination buffer for data
 * @param len   Number of bytes in block (this one and every other)
 * @return number of bytes loaded
 */
static int load_block(unsigned block, uchar *dst, unsigned len)
{
        /* We may want to get the final block from the previous set */
        ulong offset = ((int)block - 1) * len + tftp_block_wrap_offset;
        ulong tosend = len;

        tosend = min(net_boot_file_size - offset, tosend);
        (void)memcpy(dst, (void *)(save_addr + offset), tosend);
        debug("%s: block=%d, offset=%ld, len=%d, tosend=%ld\n", __func__,
              block, offset, len, tosend);
        return tosend;
}
#endif

static void tftp_send(void);
static void tftp_timeout_handler(void);

/**********************************************************************/

static void show_block_marker(void)
{
#ifdef CONFIG_TFTP_TSIZE
        if (tftp_tsize) {
                ulong pos = tftp_cur_block * tftp_block_size +
                        tftp_block_wrap_offset;
                if (pos > tftp_tsize)
                        pos = tftp_tsize;

                while (tftp_tsize_num_hash < pos * 50 / tftp_tsize) {
                        putc('#');
                        tftp_tsize_num_hash++;
                }
        } else
#endif
        {
                if (((tftp_cur_block - 1) % 10) == 0)
                        putc('#');
                else if ((tftp_cur_block % (10 * HASHES_PER_LINE)) == 0)
                        puts("\n\t ");
        }
}

/**
 * restart the current transfer due to an error
 *
 * @param msg   Message to print for user
 */
static void restart(const char *msg)
{
        printf("\n%s; starting again\n", msg);
#ifdef CONFIG_MCAST_TFTP
        mcast_cleanup();
#endif
        net_start_again();
}

/*
 * Check if the block number has wrapped, and update progress
 *
 * TODO: The egregious use of global variables in this file should be tidied.
 */
static void update_block_number(void)
{
        /*
         * RFC1350 specifies that the first data packet will
         * have sequence number 1. If we receive a sequence
         * number of 0 this means that there was a wrap
         * around of the (16 bit) counter.
         */
        if (tftp_cur_block == 0 && tftp_prev_block != 0) {
                tftp_block_wrap++;
                tftp_block_wrap_offset += tftp_block_size * TFTP_SEQUENCE_SIZE;
                timeout_count = 0; /* we've done well, reset the timeout */
        } else {
                show_block_marker();
        }
}

/* The TFTP get or put is complete */
static void tftp_complete(void)
{
#ifdef CONFIG_TFTP_TSIZE
        /* Print hash marks for the last packet received */
        while (tftp_tsize && tftp_tsize_num_hash < 49) {
                putc('#');
                tftp_tsize_num_hash++;
        }
        puts("  ");
        print_size(tftp_tsize, "");
#endif
        time_start = get_timer(time_start);
        if (time_start > 0) {
                puts("\n\t ");  /* Line up with "Loading: " */
                print_size(net_boot_file_size /
                        time_start * 1000, "/s");
        }
        puts("\ndone\n");
        net_set_state(NETLOOP_SUCCESS);
}

static void tftp_send(void)
{
        uchar *pkt;
        uchar *xp;
        int len = 0;
        ushort *s;

#ifdef CONFIG_MCAST_TFTP
        /* Multicast TFTP.. non-MasterClients do not ACK data. */
        if (tftp_mcast_active && tftp_state == STATE_DATA &&
            tftp_mcast_master_client == 0)
                return;
#endif
        /*
         *      We will always be sending some sort of packet, so
         *      cobble together the packet headers now.
         */
        pkt = net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;

        switch (tftp_state) {
        case STATE_SEND_RRQ:
        case STATE_SEND_WRQ:
                xp = pkt;
                s = (ushort *)pkt;
#ifdef CONFIG_CMD_TFTPPUT
                *s++ = htons(tftp_state == STATE_SEND_RRQ ? TFTP_RRQ :
                        TFTP_WRQ);
#else
                *s++ = htons(TFTP_RRQ);
#endif
                pkt = (uchar *)s;
                strcpy((char *)pkt, tftp_filename);
                pkt += strlen(tftp_filename) + 1;
                strcpy((char *)pkt, "octet");
                pkt += 5 /*strlen("octet")*/ + 1;
                strcpy((char *)pkt, "timeout");
                pkt += 7 /*strlen("timeout")*/ + 1;
                sprintf((char *)pkt, "%lu", timeout_ms / 1000);
                debug("send option \"timeout %s\"\n", (char *)pkt);
                pkt += strlen((char *)pkt) + 1;
#ifdef CONFIG_TFTP_TSIZE
                pkt += sprintf((char *)pkt, "tsize%c%u%c",
                                0, net_boot_file_size, 0);
#endif
                /* try for more effic. blk size */
                pkt += sprintf((char *)pkt, "blksize%c%d%c",
                                0, tftp_block_size_option, 0);
#ifdef CONFIG_MCAST_TFTP
                /* Check all preconditions before even trying the option */
                if (!tftp_mcast_disabled) {
                        tftp_mcast_bitmap = malloc(tftp_mcast_bitmap_size);
                        if (tftp_mcast_bitmap && eth_get_dev()->mcast) {
                                free(tftp_mcast_bitmap);
                                tftp_mcast_bitmap = NULL;
                                pkt += sprintf((char *)pkt, "multicast%c%c",
                                        0, 0);
                        }
                }
#endif /* CONFIG_MCAST_TFTP */
                len = pkt - xp;
                break;

        case STATE_OACK:
#ifdef CONFIG_MCAST_TFTP
                /* My turn!  Start at where I need blocks I missed. */
                if (tftp_mcast_active)
                        tftp_cur_block = ext2_find_next_zero_bit(
                                tftp_mcast_bitmap,
                                tftp_mcast_bitmap_size * 8, 0);
                /* fall through */
#endif

        case STATE_RECV_WRQ:
        case STATE_DATA:
                xp = pkt;
                s = (ushort *)pkt;
                s[0] = htons(TFTP_ACK);
                s[1] = htons(tftp_cur_block);
                pkt = (uchar *)(s + 2);
#ifdef CONFIG_CMD_TFTPPUT
                if (tftp_put_active) {
                        int toload = tftp_block_size;
                        int loaded = load_block(tftp_cur_block, pkt, toload);

                        s[0] = htons(TFTP_DATA);
                        pkt += loaded;
                        tftp_put_final_block_sent = (loaded < toload);
                }
#endif
                len = pkt - xp;
                break;

        case STATE_TOO_LARGE:
                xp = pkt;
                s = (ushort *)pkt;
                *s++ = htons(TFTP_ERROR);
                        *s++ = htons(3);

                pkt = (uchar *)s;
                strcpy((char *)pkt, "File too large");
                pkt += 14 /*strlen("File too large")*/ + 1;
                len = pkt - xp;
                break;

        case STATE_BAD_MAGIC:
                xp = pkt;
                s = (ushort *)pkt;
                *s++ = htons(TFTP_ERROR);
                *s++ = htons(2);
                pkt = (uchar *)s;
                strcpy((char *)pkt, "File has bad magic");
                pkt += 18 /*strlen("File has bad magic")*/ + 1;
                len = pkt - xp;
                break;
        }

        net_send_udp_packet(net_server_ethaddr, tftp_remote_ip,
                            tftp_remote_port, tftp_our_port, len);
}

#ifdef CONFIG_CMD_TFTPPUT
static void icmp_handler(unsigned type, unsigned code, unsigned dest,
                         struct in_addr sip, unsigned src, uchar *pkt,
                         unsigned len)
{
        if (type == ICMP_NOT_REACH && code == ICMP_NOT_REACH_PORT) {
                /* Oh dear the other end has gone away */
                restart("TFTP server died");
        }
}
#endif

static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
                         unsigned src, unsigned len)
{
        __be16 proto;
        __be16 *s;
        int i;

        if (dest != tftp_our_port) {
#ifdef CONFIG_MCAST_TFTP
                if (tftp_mcast_active &&
                    (!tftp_mcast_port || dest != tftp_mcast_port))
#endif
                        return;
        }
        if (tftp_state != STATE_SEND_RRQ && src != tftp_remote_port &&
            tftp_state != STATE_RECV_WRQ && tftp_state != STATE_SEND_WRQ)
                return;

        if (len < 2)
                return;
        len -= 2;
        /* warning: don't use increment (++) in ntohs() macros!! */
        s = (__be16 *)pkt;
        proto = *s++;
        pkt = (uchar *)s;
        switch (ntohs(proto)) {
        case TFTP_RRQ:
                break;

        case TFTP_ACK:
#ifdef CONFIG_CMD_TFTPPUT
                if (tftp_put_active) {
                        if (tftp_put_final_block_sent) {
                                tftp_complete();
                        } else {
                                /*
                                 * Move to the next block. We want our block
                                 * count to wrap just like the other end!
                                 */
                                int block = ntohs(*s);
                                int ack_ok = (tftp_cur_block == block);

                                tftp_cur_block = (unsigned short)(block + 1);
                                update_block_number();
                                if (ack_ok)
                                        tftp_send(); /* Send next data block */
                        }
                }
#endif
                break;

        default:
                break;

#ifdef CONFIG_CMD_TFTPSRV
        case TFTP_WRQ:
                debug("Got WRQ\n");
                tftp_remote_ip = sip;
                tftp_remote_port = src;
                tftp_our_port = 1024 + (get_timer(0) % 3072);
                new_transfer();
                tftp_send(); /* Send ACK(0) */
                break;
#endif

        case TFTP_OACK:
                debug("Got OACK: %s %s\n",
                      pkt, pkt + strlen((char *)pkt) + 1);
                tftp_state = STATE_OACK;
                tftp_remote_port = src;
                /*
                 * Check for 'blksize' option.
                 * Careful: "i" is signed, "len" is unsigned, thus
                 * something like "len-8" may give a *huge* number
                 */
                for (i = 0; i+8 < len; i++) {
                        if (strcmp((char *)pkt + i, "blksize") == 0) {
                                tftp_block_size = (unsigned short)
                                        simple_strtoul((char *)pkt + i + 8,
                                                       NULL, 10);
                                debug("Blocksize ack: %s, %d\n",
                                      (char *)pkt + i + 8, tftp_block_size);
                        }
#ifdef CONFIG_TFTP_TSIZE
                        if (strcmp((char *)pkt+i, "tsize") == 0) {
                                tftp_tsize = simple_strtoul((char *)pkt + i + 6,
                                                           NULL, 10);
                                debug("size = %s, %d\n",
                                      (char *)pkt + i + 6, tftp_tsize);
                        }
#endif
                }
#ifdef CONFIG_MCAST_TFTP
                parse_multicast_oack((char *)pkt, len - 1);
                if ((tftp_mcast_active) && (!tftp_mcast_master_client))
                        tftp_state = STATE_DATA;        /* passive.. */
                else
#endif
#ifdef CONFIG_CMD_TFTPPUT
                if (tftp_put_active) {
                        /* Get ready to send the first block */
                        tftp_state = STATE_DATA;
                        tftp_cur_block++;
                }
#endif
                tftp_send(); /* Send ACK or first data block */
                break;
        case TFTP_DATA:
                if (len < 2)
                        return;
                len -= 2;
                tftp_cur_block = ntohs(*(__be16 *)pkt);

                update_block_number();

                if (tftp_state == STATE_SEND_RRQ)
                        debug("Server did not acknowledge timeout option!\n");

                if (tftp_state == STATE_SEND_RRQ || tftp_state == STATE_OACK ||
                    tftp_state == STATE_RECV_WRQ) {
                        /* first block received */
                        tftp_state = STATE_DATA;
                        tftp_remote_port = src;
                        new_transfer();

#ifdef CONFIG_MCAST_TFTP
                        if (tftp_mcast_active) { /* start!=1 common if mcast */
                                tftp_prev_block = tftp_cur_block - 1;
                        } else
#endif
                        if (tftp_cur_block != 1) {      /* Assertion */
                                puts("\nTFTP error: ");
                                printf("First block is not block 1 (%ld)\n",
                                       tftp_cur_block);
                                puts("Starting again\n\n");
                                net_start_again();
                                break;
                        }
                }

                if (tftp_cur_block == tftp_prev_block) {
                        /* Same block again; ignore it. */
                        break;
                }

                tftp_prev_block = tftp_cur_block;
                timeout_count_max = tftp_timeout_count_max;
                net_set_timeout_handler(timeout_ms, tftp_timeout_handler);

                store_block(tftp_cur_block - 1, pkt + 2, len);

                /*
                 *      Acknowledge the block just received, which will prompt
                 *      the remote for the next one.
                 */
#ifdef CONFIG_MCAST_TFTP
                /* if I am the MasterClient, actively calculate what my next
                 * needed block is; else I'm passive; not ACKING
                 */
                if (tftp_mcast_active) {
                        if (len < tftp_block_size)  {
                                tftp_mcast_ending_block = tftp_cur_block;
                        } else if (tftp_mcast_master_client) {
                                tftp_mcast_prev_hole = ext2_find_next_zero_bit(
                                        tftp_mcast_bitmap,
                                        tftp_mcast_bitmap_size * 8,
                                        tftp_mcast_prev_hole);
                                tftp_cur_block = tftp_mcast_prev_hole;
                                if (tftp_cur_block >
                                    ((tftp_mcast_bitmap_size * 8) - 1)) {
                                        debug("tftpfile too big\n");
                                        /* try to double it and retry */
                                        tftp_mcast_bitmap_size <<= 1;
                                        mcast_cleanup();
                                        net_start_again();
                                        return;
                                }
                                tftp_prev_block = tftp_cur_block;
                        }
                }
#endif
                tftp_send();

#ifdef CONFIG_MCAST_TFTP
                if (tftp_mcast_active) {
                        if (tftp_mcast_master_client &&
                            (tftp_cur_block >= tftp_mcast_ending_block)) {
                                puts("\nMulticast tftp done\n");
                                mcast_cleanup();
                                net_set_state(NETLOOP_SUCCESS);
                        }
                } else
#endif
                if (len < tftp_block_size)
                        tftp_complete();
                break;

        case TFTP_ERROR:
                printf("\nTFTP error: '%s' (%d)\n",
                       pkt + 2, ntohs(*(__be16 *)pkt));

                switch (ntohs(*(__be16 *)pkt)) {
                case TFTP_ERR_FILE_NOT_FOUND:
                case TFTP_ERR_ACCESS_DENIED:
                        puts("Not retrying...\n");
                        eth_halt();
                        net_set_state(NETLOOP_FAIL);
                        break;
                case TFTP_ERR_UNDEFINED:
                case TFTP_ERR_DISK_FULL:
                case TFTP_ERR_UNEXPECTED_OPCODE:
                case TFTP_ERR_UNKNOWN_TRANSFER_ID:
                case TFTP_ERR_FILE_ALREADY_EXISTS:
                default:
                        puts("Starting again\n\n");
#ifdef CONFIG_MCAST_TFTP
                        mcast_cleanup();
#endif
                        net_start_again();
                        break;
                }
                break;
        }
}


static void tftp_timeout_handler(void)
{
        if (++timeout_count > timeout_count_max) {
                restart("Retry count exceeded");
        } else {
                puts("T ");
                net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
                if (tftp_state != STATE_RECV_WRQ)
                        tftp_send();
        }
}


void tftp_start(enum proto_t protocol)
{
#if CONFIG_NET_TFTP_VARS
        char *ep;             /* Environment pointer */

        /*
         * Allow the user to choose TFTP blocksize and timeout.
         * TFTP protocol has a minimal timeout of 1 second.
         */

        ep = getenv("tftpblocksize");
        if (ep != NULL)
                tftp_block_size_option = simple_strtol(ep, NULL, 10);

        ep = getenv("tftptimeout");
        if (ep != NULL)
                timeout_ms = simple_strtol(ep, NULL, 10);

        if (timeout_ms < 1000) {
                printf("TFTP timeout (%ld ms) too low, set min = 1000 ms\n",
                       timeout_ms);
                timeout_ms = 1000;
        }

        ep = getenv("tftptimeoutcountmax");
        if (ep != NULL)
                tftp_timeout_count_max = simple_strtol(ep, NULL, 10);

        if (tftp_timeout_count_max < 0) {
                printf("TFTP timeout count max (%d ms) negative, set to 0\n",
                       tftp_timeout_count_max);
                tftp_timeout_count_max = 0;
        }
#endif

        debug("TFTP blocksize = %i, timeout = %ld ms\n",
              tftp_block_size_option, timeout_ms);

        tftp_remote_ip = net_server_ip;
        if (net_boot_file_name[0] == '\0') {
                sprintf(default_filename, "%02X%02X%02X%02X.img",
                        net_ip.s_addr & 0xFF,
                        (net_ip.s_addr >>  8) & 0xFF,
                        (net_ip.s_addr >> 16) & 0xFF,
                        (net_ip.s_addr >> 24) & 0xFF);

                strncpy(tftp_filename, default_filename, MAX_LEN);
                tftp_filename[MAX_LEN - 1] = 0;

                printf("*** Warning: no boot file name; using '%s'\n",
                       tftp_filename);
        } else {
                char *p = strchr(net_boot_file_name, ':');

                if (p == NULL) {
                        strncpy(tftp_filename, net_boot_file_name, MAX_LEN);
                        tftp_filename[MAX_LEN - 1] = 0;
                } else {
                        tftp_remote_ip = string_to_ip(net_boot_file_name);
                        strncpy(tftp_filename, p + 1, MAX_LEN);
                        tftp_filename[MAX_LEN - 1] = 0;
                }
        }

        printf("Using %s device\n", eth_get_name());
        printf("TFTP %s server %pI4; our IP address is %pI4",
#ifdef CONFIG_CMD_TFTPPUT
               protocol == TFTPPUT ? "to" : "from",
#else
               "from",
#endif
               &tftp_remote_ip, &net_ip);

        /* Check if we need to send across this subnet */
        if (net_gateway.s_addr && net_netmask.s_addr) {
                struct in_addr our_net;
                struct in_addr remote_net;

                our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
                remote_net.s_addr = tftp_remote_ip.s_addr & net_netmask.s_addr;
                if (our_net.s_addr != remote_net.s_addr)
                        printf("; sending through gateway %pI4", &net_gateway);
        }
        putc('\n');

        printf("Filename '%s'.", tftp_filename);

        if (net_boot_file_expected_size_in_blocks) {
                printf(" Size is 0x%x Bytes = ",
                       net_boot_file_expected_size_in_blocks << 9);
                print_size(net_boot_file_expected_size_in_blocks << 9, "");
        }

        putc('\n');
#ifdef CONFIG_CMD_TFTPPUT
        tftp_put_active = (protocol == TFTPPUT);
        if (tftp_put_active) {
                printf("Save address: 0x%lx\n", save_addr);
                printf("Save size:    0x%lx\n", save_size);
                net_boot_file_size = save_size;
                puts("Saving: *\b");
                tftp_state = STATE_SEND_WRQ;
                new_transfer();
        } else
#endif
        {
                printf("Load address: 0x%lx\n", load_addr);
                puts("Loading: *\b");
                tftp_state = STATE_SEND_RRQ;
                efi_set_bootdev("Net", "", tftp_filename);
        }

        time_start = get_timer(0);
        timeout_count_max = tftp_timeout_count_max;

        net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
        net_set_udp_handler(tftp_handler);
#ifdef CONFIG_CMD_TFTPPUT
        net_set_icmp_handler(icmp_handler);
#endif
        tftp_remote_port = WELL_KNOWN_PORT;
        timeout_count = 0;
        /* Use a pseudo-random port unless a specific port is set */
        tftp_our_port = 1024 + (get_timer(0) % 3072);

#ifdef CONFIG_TFTP_PORT
        ep = getenv("tftpdstp");
        if (ep != NULL)
                tftp_remote_port = simple_strtol(ep, NULL, 10);
        ep = getenv("tftpsrcp");
        if (ep != NULL)
                tftp_our_port = simple_strtol(ep, NULL, 10);
#endif
        tftp_cur_block = 0;

        /* zero out server ether in case the server ip has changed */
        memset(net_server_ethaddr, 0, 6);
        /* Revert tftp_block_size to dflt */
        tftp_block_size = TFTP_BLOCK_SIZE;
#ifdef CONFIG_MCAST_TFTP
        mcast_cleanup();
#endif
#ifdef CONFIG_TFTP_TSIZE
        tftp_tsize = 0;
        tftp_tsize_num_hash = 0;
#endif

        tftp_send();
}

#ifdef CONFIG_CMD_TFTPSRV
void tftp_start_server(void)
{
        tftp_filename[0] = 0;

        printf("Using %s device\n", eth_get_name());
        printf("Listening for TFTP transfer on %pI4\n", &net_ip);
        printf("Load address: 0x%lx\n", load_addr);

        puts("Loading: *\b");

        timeout_count_max = tftp_timeout_count_max;
        timeout_count = 0;
        timeout_ms = TIMEOUT;
        net_set_timeout_handler(timeout_ms, tftp_timeout_handler);

        /* Revert tftp_block_size to dflt */
        tftp_block_size = TFTP_BLOCK_SIZE;
        tftp_cur_block = 0;
        tftp_our_port = WELL_KNOWN_PORT;

#ifdef CONFIG_TFTP_TSIZE
        tftp_tsize = 0;
        tftp_tsize_num_hash = 0;
#endif

        tftp_state = STATE_RECV_WRQ;
        net_set_udp_handler(tftp_handler);

        /* zero out server ether in case the server ip has changed */
        memset(net_server_ethaddr, 0, 6);
}
#endif /* CONFIG_CMD_TFTPSRV */

#ifdef CONFIG_MCAST_TFTP
/*
 * Credits: atftp project.
 */

/*
 * Pick up BcastAddr, Port, and whether I am [now] the master-client.
 * Frame:
 *    +-------+-----------+---+-------~~-------+---+
 *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 *    +-------+-----------+---+-------~~-------+---+
 * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 * master-client, I'm a passive client, gathering what DataBlocks I may and
 * making note of which ones I got in my bitmask.
 * In theory, I never go from master->passive..
 * .. this comes in with pkt already pointing just past opc
 */
static void parse_multicast_oack(char *pkt, int len)
{
        int i;
        struct in_addr addr;
        char *mc_adr;
        char *port;
        char *mc;

        mc_adr = NULL;
        port = NULL;
        mc = NULL;
        /* march along looking for 'multicast\0', which has to start at least
         * 14 bytes back from the end.
         */
        for (i = 0; i < len - 14; i++)
                if (strcmp(pkt + i, "multicast") == 0)
                        break;
        if (i >= (len - 14)) /* non-Multicast OACK, ign. */
                return;

        i += 10; /* strlen multicast */
        mc_adr = pkt + i;
        for (; i < len; i++) {
                if (*(pkt + i) == ',') {
                        *(pkt + i) = '\0';
                        if (port) {
                                mc = pkt + i + 1;
                                break;
                        } else {
                                port = pkt + i + 1;
                        }
                }
        }
        if (!port || !mc_adr || !mc)
                return;
        if (tftp_mcast_active && tftp_mcast_master_client) {
                printf("I got a OACK as master Client, WRONG!\n");
                return;
        }
        /* ..I now accept packets destined for this MCAST addr, port */
        if (!tftp_mcast_active) {
                if (tftp_mcast_bitmap) {
                        printf("Internal failure! no mcast.\n");
                        free(tftp_mcast_bitmap);
                        tftp_mcast_bitmap = NULL;
                        tftp_mcast_disabled = 1;
                        return;
                }
                /* I malloc instead of pre-declare; so that if the file ends
                 * up being too big for this bitmap I can retry
                 */
                tftp_mcast_bitmap = malloc(tftp_mcast_bitmap_size);
                if (!tftp_mcast_bitmap) {
                        printf("No bitmap, no multicast. Sorry.\n");
                        tftp_mcast_disabled = 1;
                        return;
                }
                memset(tftp_mcast_bitmap, 0, tftp_mcast_bitmap_size);
                tftp_mcast_prev_hole = 0;
                tftp_mcast_active = 1;
        }
        addr = string_to_ip(mc_adr);
        if (net_mcast_addr.s_addr != addr.s_addr) {
                if (net_mcast_addr.s_addr)
                        eth_mcast_join(net_mcast_addr, 0);
                net_mcast_addr = addr;
                if (eth_mcast_join(net_mcast_addr, 1)) {
                        printf("Fail to set mcast, revert to TFTP\n");
                        tftp_mcast_disabled = 1;
                        mcast_cleanup();
                        net_start_again();
                }
        }
        tftp_mcast_master_client = simple_strtoul((char *)mc, NULL, 10);
        tftp_mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
        printf("Multicast: %s:%d [%d]\n", mc_adr, tftp_mcast_port,
               tftp_mcast_master_client);
        return;
}

#endif /* Multicast TFTP */