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![Wolfgang Denk](/assets/img/avatar_default.png)
So far, TFTP negotiated a fixed retransmission timeout of 5 seconds. In some cases (busy networks, slow TFTP servers) this caused very slow transfers. A new environment variable "tftptimeout" allows to set this timeout. Lowering this value may make downloads succeed faster in networks with high packet loss rates or with unreliable TFTP servers. Signed-off-by: Wolfgang Denk <wd@denx.de> Cc: Ben Warren <biggerbadderben@gmail.com> Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
730 lines
18 KiB
C
730 lines
18 KiB
C
/*
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* Copyright 1994, 1995, 2000 Neil Russell.
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* (See License)
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* Copyright 2000, 2001 DENX Software Engineering, Wolfgang Denk, wd@denx.de
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*/
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#include <common.h>
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#include <command.h>
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#include <net.h>
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#include "tftp.h"
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#include "bootp.h"
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#define WELL_KNOWN_PORT 69 /* Well known TFTP port # */
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#define TIMEOUT 5000UL /* Millisecs to timeout for lost pkt */
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#ifndef CONFIG_NET_RETRY_COUNT
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# define TIMEOUT_COUNT 10 /* # of timeouts before giving up */
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#else
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# define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT * 2)
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#endif
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/* (for checking the image size) */
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#define HASHES_PER_LINE 65 /* Number of "loading" hashes per line */
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/*
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* TFTP operations.
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*/
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#define TFTP_RRQ 1
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#define TFTP_WRQ 2
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#define TFTP_DATA 3
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#define TFTP_ACK 4
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#define TFTP_ERROR 5
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#define TFTP_OACK 6
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static ulong TftpTimeoutMSecs = TIMEOUT;
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static int TftpTimeoutCountMax = TIMEOUT_COUNT;
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/*
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* These globals govern the timeout behavior when attempting a connection to a
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* TFTP server. TftpRRQTimeoutMSecs specifies the number of milliseconds to
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* wait for the server to respond to initial connection. Second global,
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* TftpRRQTimeoutCountMax, gives the number of such connection retries.
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* TftpRRQTimeoutCountMax must be non-negative and TftpRRQTimeoutMSecs must be
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* positive. The globals are meant to be set (and restored) by code needing
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* non-standard timeout behavior when initiating a TFTP transfer.
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*/
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ulong TftpRRQTimeoutMSecs = TIMEOUT;
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int TftpRRQTimeoutCountMax = TIMEOUT_COUNT;
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enum {
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TFTP_ERR_UNDEFINED = 0,
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TFTP_ERR_FILE_NOT_FOUND = 1,
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TFTP_ERR_ACCESS_DENIED = 2,
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TFTP_ERR_DISK_FULL = 3,
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TFTP_ERR_UNEXPECTED_OPCODE = 4,
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TFTP_ERR_UNKNOWN_TRANSFER_ID = 5,
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TFTP_ERR_FILE_ALREADY_EXISTS = 6,
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};
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static IPaddr_t TftpServerIP;
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static int TftpServerPort; /* The UDP port at their end */
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static int TftpOurPort; /* The UDP port at our end */
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static int TftpTimeoutCount;
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static ulong TftpBlock; /* packet sequence number */
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static ulong TftpLastBlock; /* last packet sequence number received */
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static ulong TftpBlockWrap; /* count of sequence number wraparounds */
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static ulong TftpBlockWrapOffset; /* memory offset due to wrapping */
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static int TftpState;
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#ifdef CONFIG_TFTP_TSIZE
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static int TftpTsize; /* The file size reported by the server */
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static short TftpNumchars; /* The number of hashes we printed */
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#endif
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#define STATE_RRQ 1
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#define STATE_DATA 2
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#define STATE_TOO_LARGE 3
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#define STATE_BAD_MAGIC 4
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#define STATE_OACK 5
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#define TFTP_BLOCK_SIZE 512 /* default TFTP block size */
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#define TFTP_SEQUENCE_SIZE ((ulong)(1<<16)) /* sequence number is 16 bit */
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#define DEFAULT_NAME_LEN (8 + 4 + 1)
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static char default_filename[DEFAULT_NAME_LEN];
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#ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
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#define MAX_LEN 128
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#else
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#define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
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#endif
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static char tftp_filename[MAX_LEN];
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#ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
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extern flash_info_t flash_info[];
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#endif
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/* 512 is poor choice for ethernet, MTU is typically 1500.
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* Minus eth.hdrs thats 1468. Can get 2x better throughput with
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* almost-MTU block sizes. At least try... fall back to 512 if need be.
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* (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
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*/
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#ifdef CONFIG_TFTP_BLOCKSIZE
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#define TFTP_MTU_BLOCKSIZE CONFIG_TFTP_BLOCKSIZE
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#else
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#define TFTP_MTU_BLOCKSIZE 1468
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#endif
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static unsigned short TftpBlkSize=TFTP_BLOCK_SIZE;
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static unsigned short TftpBlkSizeOption=TFTP_MTU_BLOCKSIZE;
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#ifdef CONFIG_MCAST_TFTP
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#include <malloc.h>
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#define MTFTP_BITMAPSIZE 0x1000
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static unsigned *Bitmap;
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static int PrevBitmapHole,Mapsize=MTFTP_BITMAPSIZE;
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static uchar ProhibitMcast=0, MasterClient=0;
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static uchar Multicast=0;
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extern IPaddr_t Mcast_addr;
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static int Mcast_port;
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static ulong TftpEndingBlock; /* can get 'last' block before done..*/
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static void parse_multicast_oack(char *pkt,int len);
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static void
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mcast_cleanup(void)
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{
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if (Mcast_addr) eth_mcast_join(Mcast_addr, 0);
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if (Bitmap) free(Bitmap);
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Bitmap=NULL;
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Mcast_addr = Multicast = Mcast_port = 0;
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TftpEndingBlock = -1;
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}
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#endif /* CONFIG_MCAST_TFTP */
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static __inline__ void
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store_block (unsigned block, uchar * src, unsigned len)
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{
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ulong offset = block * TftpBlkSize + TftpBlockWrapOffset;
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ulong newsize = offset + len;
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#ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
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int i, rc = 0;
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for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; i++) {
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/* start address in flash? */
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if (flash_info[i].flash_id == FLASH_UNKNOWN)
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continue;
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if (load_addr + offset >= flash_info[i].start[0]) {
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rc = 1;
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break;
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}
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}
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if (rc) { /* Flash is destination for this packet */
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rc = flash_write ((char *)src, (ulong)(load_addr+offset), len);
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if (rc) {
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flash_perror (rc);
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NetState = NETLOOP_FAIL;
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return;
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}
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}
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else
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#endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
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{
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(void)memcpy((void *)(load_addr + offset), src, len);
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}
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#ifdef CONFIG_MCAST_TFTP
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if (Multicast)
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ext2_set_bit(block, Bitmap);
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#endif
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if (NetBootFileXferSize < newsize)
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NetBootFileXferSize = newsize;
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}
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static void TftpSend (void);
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static void TftpTimeout (void);
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/**********************************************************************/
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static void
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TftpSend (void)
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{
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volatile uchar * pkt;
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volatile uchar * xp;
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int len = 0;
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volatile ushort *s;
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#ifdef CONFIG_MCAST_TFTP
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/* Multicast TFTP.. non-MasterClients do not ACK data. */
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if (Multicast
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&& (TftpState == STATE_DATA)
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&& (MasterClient == 0))
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return;
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#endif
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/*
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* We will always be sending some sort of packet, so
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* cobble together the packet headers now.
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*/
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pkt = NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE;
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switch (TftpState) {
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case STATE_RRQ:
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xp = pkt;
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s = (ushort *)pkt;
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*s++ = htons(TFTP_RRQ);
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pkt = (uchar *)s;
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strcpy ((char *)pkt, tftp_filename);
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pkt += strlen(tftp_filename) + 1;
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strcpy ((char *)pkt, "octet");
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pkt += 5 /*strlen("octet")*/ + 1;
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strcpy ((char *)pkt, "timeout");
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pkt += 7 /*strlen("timeout")*/ + 1;
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sprintf((char *)pkt, "%lu", TftpTimeoutMSecs / 1000);
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debug("send option \"timeout %s\"\n", (char *)pkt);
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pkt += strlen((char *)pkt) + 1;
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#ifdef CONFIG_TFTP_TSIZE
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memcpy((char *)pkt, "tsize\0000\0", 8);
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pkt += 8;
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#endif
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/* try for more effic. blk size */
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pkt += sprintf((char *)pkt,"blksize%c%d%c",
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0,TftpBlkSizeOption,0);
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#ifdef CONFIG_MCAST_TFTP
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/* Check all preconditions before even trying the option */
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if (!ProhibitMcast
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&& (Bitmap=malloc(Mapsize))
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&& eth_get_dev()->mcast) {
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free(Bitmap);
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Bitmap=NULL;
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pkt += sprintf((char *)pkt,"multicast%c%c",0,0);
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}
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#endif /* CONFIG_MCAST_TFTP */
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len = pkt - xp;
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break;
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case STATE_OACK:
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#ifdef CONFIG_MCAST_TFTP
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/* My turn! Start at where I need blocks I missed.*/
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if (Multicast)
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TftpBlock=ext2_find_next_zero_bit(Bitmap,(Mapsize*8),0);
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/*..falling..*/
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#endif
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case STATE_DATA:
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xp = pkt;
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s = (ushort *)pkt;
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*s++ = htons(TFTP_ACK);
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*s++ = htons(TftpBlock);
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pkt = (uchar *)s;
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len = pkt - xp;
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break;
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case STATE_TOO_LARGE:
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xp = pkt;
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s = (ushort *)pkt;
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*s++ = htons(TFTP_ERROR);
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*s++ = htons(3);
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pkt = (uchar *)s;
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strcpy ((char *)pkt, "File too large");
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pkt += 14 /*strlen("File too large")*/ + 1;
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len = pkt - xp;
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break;
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case STATE_BAD_MAGIC:
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xp = pkt;
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s = (ushort *)pkt;
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*s++ = htons(TFTP_ERROR);
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*s++ = htons(2);
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pkt = (uchar *)s;
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strcpy ((char *)pkt, "File has bad magic");
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pkt += 18 /*strlen("File has bad magic")*/ + 1;
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len = pkt - xp;
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break;
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}
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NetSendUDPPacket(NetServerEther, TftpServerIP, TftpServerPort, TftpOurPort, len);
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}
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static void
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TftpHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
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{
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ushort proto;
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ushort *s;
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int i;
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if (dest != TftpOurPort) {
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#ifdef CONFIG_MCAST_TFTP
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if (Multicast
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&& (!Mcast_port || (dest != Mcast_port)))
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#endif
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return;
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}
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if (TftpState != STATE_RRQ && src != TftpServerPort) {
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return;
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}
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if (len < 2) {
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return;
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}
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len -= 2;
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/* warning: don't use increment (++) in ntohs() macros!! */
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s = (ushort *)pkt;
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proto = *s++;
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pkt = (uchar *)s;
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switch (ntohs(proto)) {
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case TFTP_RRQ:
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case TFTP_WRQ:
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case TFTP_ACK:
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break;
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default:
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break;
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case TFTP_OACK:
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debug("Got OACK: %s %s\n",
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pkt,
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pkt + strlen((char *)pkt) + 1);
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TftpState = STATE_OACK;
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TftpServerPort = src;
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/*
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* Check for 'blksize' option.
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* Careful: "i" is signed, "len" is unsigned, thus
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* something like "len-8" may give a *huge* number
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*/
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for (i=0; i+8<len; i++) {
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if (strcmp ((char*)pkt+i,"blksize") == 0) {
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TftpBlkSize = (unsigned short)
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simple_strtoul((char*)pkt+i+8,NULL,10);
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debug("Blocksize ack: %s, %d\n",
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(char*)pkt+i+8,TftpBlkSize);
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}
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#ifdef CONFIG_TFTP_TSIZE
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if (strcmp ((char*)pkt+i,"tsize") == 0) {
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TftpTsize = simple_strtoul((char*)pkt+i+6,NULL,10);
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debug("size = %s, %d\n",
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(char*)pkt+i+6, TftpTsize);
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}
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#endif
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}
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#ifdef CONFIG_MCAST_TFTP
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parse_multicast_oack((char *)pkt,len-1);
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if ((Multicast) && (!MasterClient))
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TftpState = STATE_DATA; /* passive.. */
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else
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#endif
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TftpSend (); /* Send ACK */
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break;
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case TFTP_DATA:
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if (len < 2)
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return;
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len -= 2;
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TftpBlock = ntohs(*(ushort *)pkt);
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/*
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* RFC1350 specifies that the first data packet will
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* have sequence number 1. If we receive a sequence
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* number of 0 this means that there was a wrap
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* around of the (16 bit) counter.
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*/
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if (TftpBlock == 0) {
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TftpBlockWrap++;
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TftpBlockWrapOffset += TftpBlkSize * TFTP_SEQUENCE_SIZE;
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printf ("\n\t %lu MB received\n\t ", TftpBlockWrapOffset>>20);
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}
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#ifdef CONFIG_TFTP_TSIZE
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else if (TftpTsize) {
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while (TftpNumchars < NetBootFileXferSize * 50 / TftpTsize) {
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putc('#');
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TftpNumchars++;
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}
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}
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#endif
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else {
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if (((TftpBlock - 1) % 10) == 0) {
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putc ('#');
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} else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0) {
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puts ("\n\t ");
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}
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}
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if (TftpState == STATE_RRQ)
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debug("Server did not acknowledge timeout option!\n");
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if (TftpState == STATE_RRQ || TftpState == STATE_OACK) {
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/* first block received */
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TftpState = STATE_DATA;
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TftpServerPort = src;
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TftpLastBlock = 0;
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TftpBlockWrap = 0;
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TftpBlockWrapOffset = 0;
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#ifdef CONFIG_MCAST_TFTP
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if (Multicast) { /* start!=1 common if mcast */
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TftpLastBlock = TftpBlock - 1;
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} else
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#endif
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if (TftpBlock != 1) { /* Assertion */
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printf ("\nTFTP error: "
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"First block is not block 1 (%ld)\n"
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"Starting again\n\n",
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TftpBlock);
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NetStartAgain ();
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break;
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}
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}
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if (TftpBlock == TftpLastBlock) {
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/*
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* Same block again; ignore it.
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*/
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break;
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}
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TftpLastBlock = TftpBlock;
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TftpTimeoutCountMax = TIMEOUT_COUNT;
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NetSetTimeout (TftpTimeoutMSecs, TftpTimeout);
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store_block (TftpBlock - 1, pkt + 2, len);
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/*
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* Acknoledge the block just received, which will prompt
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* the server for the next one.
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*/
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#ifdef CONFIG_MCAST_TFTP
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/* if I am the MasterClient, actively calculate what my next
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* needed block is; else I'm passive; not ACKING
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*/
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if (Multicast) {
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if (len < TftpBlkSize) {
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TftpEndingBlock = TftpBlock;
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} else if (MasterClient) {
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TftpBlock = PrevBitmapHole =
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ext2_find_next_zero_bit(
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Bitmap,
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(Mapsize*8),
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PrevBitmapHole);
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if (TftpBlock > ((Mapsize*8) - 1)) {
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printf ("tftpfile too big\n");
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/* try to double it and retry */
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Mapsize<<=1;
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mcast_cleanup();
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NetStartAgain ();
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return;
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}
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TftpLastBlock = TftpBlock;
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}
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}
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#endif
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TftpSend ();
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#ifdef CONFIG_MCAST_TFTP
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if (Multicast) {
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if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
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puts ("\nMulticast tftp done\n");
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mcast_cleanup();
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NetState = NETLOOP_SUCCESS;
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}
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}
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else
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#endif
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if (len < TftpBlkSize) {
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/*
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* We received the whole thing. Try to
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* run it.
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*/
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#ifdef CONFIG_TFTP_TSIZE
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/* Print out the hash marks for the last packet received */
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while (TftpTsize && TftpNumchars < 49) {
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putc('#');
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TftpNumchars++;
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}
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#endif
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puts ("\ndone\n");
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NetState = NETLOOP_SUCCESS;
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}
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break;
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case TFTP_ERROR:
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printf ("\nTFTP error: '%s' (%d)\n",
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pkt + 2, ntohs(*(ushort *)pkt));
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switch (ntohs(*(ushort *)pkt)) {
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case TFTP_ERR_FILE_NOT_FOUND:
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case TFTP_ERR_ACCESS_DENIED:
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puts("Not retrying...\n");
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eth_halt();
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NetState = NETLOOP_FAIL;
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break;
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case TFTP_ERR_UNDEFINED:
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case TFTP_ERR_DISK_FULL:
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case TFTP_ERR_UNEXPECTED_OPCODE:
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case TFTP_ERR_UNKNOWN_TRANSFER_ID:
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case TFTP_ERR_FILE_ALREADY_EXISTS:
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default:
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puts("Starting again\n\n");
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#ifdef CONFIG_MCAST_TFTP
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mcast_cleanup();
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#endif
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NetStartAgain();
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break;
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}
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break;
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}
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}
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static void
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TftpTimeout (void)
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{
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if (++TftpTimeoutCount > TftpTimeoutCountMax) {
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puts ("\nRetry count exceeded; starting again\n");
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#ifdef CONFIG_MCAST_TFTP
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mcast_cleanup();
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#endif
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NetStartAgain ();
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} else {
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puts ("T ");
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NetSetTimeout (TftpTimeoutMSecs, TftpTimeout);
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TftpSend ();
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}
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}
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void
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TftpStart (void)
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{
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char *ep; /* Environment pointer */
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/*
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* Allow the user to choose TFTP blocksize and timeout.
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* TFTP protocol has a minimal timeout of 1 second.
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*/
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if ((ep = getenv("tftpblocksize")) != NULL)
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TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
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if ((ep = getenv("tftptimeout")) != NULL)
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TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
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if (TftpTimeoutMSecs < 1000) {
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printf("TFTP timeout (%ld ms) too low, "
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"set minimum = 1000 ms\n",
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TftpTimeoutMSecs);
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TftpTimeoutMSecs = 1000;
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}
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debug("TFTP blocksize = %i, timeout = %ld ms\n",
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TftpBlkSizeOption, TftpTimeoutMSecs);
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TftpServerIP = NetServerIP;
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if (BootFile[0] == '\0') {
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sprintf(default_filename, "%02lX%02lX%02lX%02lX.img",
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NetOurIP & 0xFF,
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(NetOurIP >> 8) & 0xFF,
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(NetOurIP >> 16) & 0xFF,
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(NetOurIP >> 24) & 0xFF );
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strncpy(tftp_filename, default_filename, MAX_LEN);
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tftp_filename[MAX_LEN-1] = 0;
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printf ("*** Warning: no boot file name; using '%s'\n",
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tftp_filename);
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} else {
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char *p = strchr (BootFile, ':');
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if (p == NULL) {
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strncpy(tftp_filename, BootFile, MAX_LEN);
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tftp_filename[MAX_LEN-1] = 0;
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} else {
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TftpServerIP = string_to_ip (BootFile);
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strncpy(tftp_filename, p + 1, MAX_LEN);
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tftp_filename[MAX_LEN-1] = 0;
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}
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}
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#if defined(CONFIG_NET_MULTI)
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printf ("Using %s device\n", eth_get_name());
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#endif
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printf("TFTP from server %pI4"
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"; our IP address is %pI4", &TftpServerIP, &NetOurIP);
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/* Check if we need to send across this subnet */
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if (NetOurGatewayIP && NetOurSubnetMask) {
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IPaddr_t OurNet = NetOurIP & NetOurSubnetMask;
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IPaddr_t ServerNet = TftpServerIP & NetOurSubnetMask;
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if (OurNet != ServerNet)
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printf("; sending through gateway %pI4", &NetOurGatewayIP);
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}
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putc ('\n');
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printf ("Filename '%s'.", tftp_filename);
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if (NetBootFileSize) {
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printf (" Size is 0x%x Bytes = ", NetBootFileSize<<9);
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print_size (NetBootFileSize<<9, "");
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}
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putc ('\n');
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printf ("Load address: 0x%lx\n", load_addr);
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puts ("Loading: *\b");
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TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
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NetSetTimeout (TftpTimeoutMSecs, TftpTimeout);
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NetSetHandler (TftpHandler);
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TftpServerPort = WELL_KNOWN_PORT;
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TftpTimeoutCount = 0;
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TftpState = STATE_RRQ;
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/* Use a pseudo-random port unless a specific port is set */
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TftpOurPort = 1024 + (get_timer(0) % 3072);
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#ifdef CONFIG_TFTP_PORT
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if ((ep = getenv("tftpdstp")) != NULL) {
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TftpServerPort = simple_strtol(ep, NULL, 10);
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}
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if ((ep = getenv("tftpsrcp")) != NULL) {
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TftpOurPort= simple_strtol(ep, NULL, 10);
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}
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#endif
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TftpBlock = 0;
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/* zero out server ether in case the server ip has changed */
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memset(NetServerEther, 0, 6);
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/* Revert TftpBlkSize to dflt */
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TftpBlkSize = TFTP_BLOCK_SIZE;
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#ifdef CONFIG_MCAST_TFTP
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mcast_cleanup();
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#endif
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#ifdef CONFIG_TFTP_TSIZE
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TftpTsize = 0;
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TftpNumchars = 0;
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#endif
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TftpSend ();
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}
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#ifdef CONFIG_MCAST_TFTP
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/* Credits: atftp project.
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*/
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/* pick up BcastAddr, Port, and whether I am [now] the master-client. *
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* Frame:
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* +-------+-----------+---+-------~~-------+---+
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* | opc | multicast | 0 | addr, port, mc | 0 |
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* +-------+-----------+---+-------~~-------+---+
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* The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
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* I am the new master-client so must send ACKs to DataBlocks. If I am not
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* master-client, I'm a passive client, gathering what DataBlocks I may and
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* making note of which ones I got in my bitmask.
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* In theory, I never go from master->passive..
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* .. this comes in with pkt already pointing just past opc
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*/
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static void parse_multicast_oack(char *pkt, int len)
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{
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int i;
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IPaddr_t addr;
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char *mc_adr, *port, *mc;
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mc_adr=port=mc=NULL;
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/* march along looking for 'multicast\0', which has to start at least
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* 14 bytes back from the end.
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*/
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for (i=0;i<len-14;i++)
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if (strcmp (pkt+i,"multicast") == 0)
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break;
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if (i >= (len-14)) /* non-Multicast OACK, ign. */
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return;
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i+=10; /* strlen multicast */
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mc_adr = pkt+i;
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for (;i<len;i++) {
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if (*(pkt+i) == ',') {
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*(pkt+i) = '\0';
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if (port) {
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mc = pkt+i+1;
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break;
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} else {
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port = pkt+i+1;
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}
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}
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}
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if (!port || !mc_adr || !mc ) return;
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if (Multicast && MasterClient) {
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printf ("I got a OACK as master Client, WRONG!\n");
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return;
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}
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/* ..I now accept packets destined for this MCAST addr, port */
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if (!Multicast) {
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if (Bitmap) {
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printf ("Internal failure! no mcast.\n");
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free(Bitmap);
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Bitmap=NULL;
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ProhibitMcast=1;
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return ;
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}
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/* I malloc instead of pre-declare; so that if the file ends
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* up being too big for this bitmap I can retry
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*/
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if (!(Bitmap = malloc (Mapsize))) {
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printf ("No Bitmap, no multicast. Sorry.\n");
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ProhibitMcast=1;
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return;
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}
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memset (Bitmap,0,Mapsize);
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PrevBitmapHole = 0;
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Multicast = 1;
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}
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addr = string_to_ip(mc_adr);
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if (Mcast_addr != addr) {
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if (Mcast_addr)
|
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eth_mcast_join(Mcast_addr, 0);
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if (eth_mcast_join(Mcast_addr=addr, 1)) {
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printf ("Fail to set mcast, revert to TFTP\n");
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ProhibitMcast=1;
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mcast_cleanup();
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NetStartAgain();
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}
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}
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MasterClient = (unsigned char)simple_strtoul((char *)mc,NULL,10);
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Mcast_port = (unsigned short)simple_strtoul(port,NULL,10);
|
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printf ("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
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return;
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}
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#endif /* Multicast TFTP */
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