multicast tftp: RFC2090
Implemented IETF RFC2090, Multicast TFTP. Initial implementation
on Realtek RTL8139 and Freescale TSEC.
Signed-off-by: David Updegraff <dave@cray.com>
Signed-off-by: Ben Warren <bwarren@qstreams.com>
diff --git a/net/tftp.c b/net/tftp.c
index d56e30b..95fee77 100644
--- a/net/tftp.c
+++ b/net/tftp.c
@@ -61,10 +61,43 @@
extern flash_info_t flash_info[];
#endif
+/* 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.
+ */
+#define TFTP_MTU_BLOCKSIZE 1468
+static unsigned short TftpBlkSize=TFTP_BLOCK_SIZE;
+static unsigned short TftpBlkSizeOption=TFTP_MTU_BLOCKSIZE;
+
+#ifdef CONFIG_MCAST_TFTP
+#include <malloc.h>
+#define MTFTP_BITMAPSIZE 0x1000
+static unsigned *Bitmap;
+static int PrevBitmapHole,Mapsize=MTFTP_BITMAPSIZE;
+static uchar ProhibitMcast=0, MasterClient=0;
+static uchar Multicast=0;
+extern IPaddr_t Mcast_addr;
+static int Mcast_port;
+static ulong TftpEndingBlock; /* can get 'last' block before done..*/
+
+static void parse_multicast_oack(char *pkt,int len);
+
+static void
+mcast_cleanup(void)
+{
+ if (Mcast_addr) eth_mcast_join(Mcast_addr, 0);
+ if (Bitmap) free(Bitmap);
+ Bitmap=NULL;
+ Mcast_addr = Multicast = Mcast_port = 0;
+ TftpEndingBlock = -1;
+}
+
+#endif /* CONFIG_MCAST_TFTP */
+
static __inline__ void
store_block (unsigned block, uchar * src, unsigned len)
{
- ulong offset = block * TFTP_BLOCK_SIZE + TftpBlockWrapOffset;
+ ulong offset = block * TftpBlkSize + TftpBlockWrapOffset;
ulong newsize = offset + len;
#ifdef CFG_DIRECT_FLASH_TFTP
int i, rc = 0;
@@ -90,6 +123,10 @@
{
(void)memcpy((void *)(load_addr + offset), src, len);
}
+#ifdef CONFIG_MCAST_TFTP
+ if (Multicast)
+ ext2_set_bit(block, Bitmap);
+#endif
if (NetBootFileXferSize < newsize)
NetBootFileXferSize = newsize;
@@ -108,6 +145,13 @@
int len = 0;
volatile ushort *s;
+#ifdef CONFIG_MCAST_TFTP
+ /* Multicast TFTP.. non-MasterClients do not ACK data. */
+ if (Multicast
+ && (TftpState == STATE_DATA)
+ && (MasterClient == 0))
+ return;
+#endif
/*
* We will always be sending some sort of packet, so
* cobble together the packet headers now.
@@ -132,11 +176,30 @@
printf("send option \"timeout %s\"\n", (char *)pkt);
#endif
pkt += strlen((char *)pkt) + 1;
+ /* try for more effic. blk size */
+ pkt += sprintf((char *)pkt,"blksize%c%d%c",
+ 0,htons(TftpBlkSizeOption),0);
+#ifdef CONFIG_MCAST_TFTP
+ /* Check all preconditions before even trying the option */
+ if (!ProhibitMcast
+ && (Bitmap=malloc(Mapsize))
+ && eth_get_dev()->mcast) {
+ free(Bitmap);
+ Bitmap=NULL;
+ pkt += sprintf((char *)pkt,"multicast%c%c",0,0);
+ }
+#endif /* CONFIG_MCAST_TFTP */
len = pkt - xp;
break;
- case STATE_DATA:
case STATE_OACK:
+#ifdef CONFIG_MCAST_TFTP
+ /* My turn! Start at where I need blocks I missed.*/
+ if (Multicast)
+ TftpBlock=ext2_find_next_zero_bit(Bitmap,(Mapsize*8),0);
+ /*..falling..*/
+#endif
+ case STATE_DATA:
xp = pkt;
s = (ushort *)pkt;
*s++ = htons(TFTP_ACK);
@@ -177,8 +240,13 @@
{
ushort proto;
ushort *s;
+ int i;
if (dest != TftpOurPort) {
+#ifdef CONFIG_MCAST_TFTP
+ if (Multicast
+ && (!Mcast_port || (dest != Mcast_port)))
+#endif
return;
}
if (TftpState != STATE_RRQ && src != TftpServerPort) {
@@ -208,6 +276,24 @@
#endif
TftpState = STATE_OACK;
TftpServerPort = src;
+ /* Check for 'blksize' option */
+ for (i=0;i<len-8;i++) {
+ if (strcmp ((char*)pkt+i,"blksize") == 0) {
+ TftpBlkSize = (unsigned short)
+ simple_strtoul((char*)pkt+i+8,NULL,10);
+#ifdef ET_DEBUG
+ printf ("Blocksize ack: %s, %d\n",
+ (char*)pkt+i+8,TftpBlkSize);
+#endif
+ break;
+ }
+ }
+#ifdef CONFIG_MCAST_TFTP
+ parse_multicast_oack((char *)pkt,len-1);
+ if ((Multicast) && (!MasterClient))
+ TftpState = STATE_DATA; /* passive.. */
+ else
+#endif
TftpSend (); /* Send ACK */
break;
case TFTP_DATA:
@@ -224,7 +310,7 @@
*/
if (TftpBlock == 0) {
TftpBlockWrap++;
- TftpBlockWrapOffset += TFTP_BLOCK_SIZE * TFTP_SEQUENCE_SIZE;
+ TftpBlockWrapOffset += TftpBlkSize * TFTP_SEQUENCE_SIZE;
printf ("\n\t %lu MB received\n\t ", TftpBlockWrapOffset>>20);
} else {
if (((TftpBlock - 1) % 10) == 0) {
@@ -248,6 +334,11 @@
TftpBlockWrap = 0;
TftpBlockWrapOffset = 0;
+#ifdef CONFIG_MCAST_TFTP
+ if (Multicast) { /* start!=1 common if mcast */
+ TftpLastBlock = TftpBlock - 1;
+ } else
+#endif
if (TftpBlock != 1) { /* Assertion */
printf ("\nTFTP error: "
"First block is not block 1 (%ld)\n"
@@ -274,9 +365,44 @@
* Acknoledge the block just received, which will prompt
* the server 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 (Multicast) {
+ if (len < TftpBlkSize) {
+ TftpEndingBlock = TftpBlock;
+ } else if (MasterClient) {
+ TftpBlock = PrevBitmapHole =
+ ext2_find_next_zero_bit(
+ Bitmap,
+ (Mapsize*8),
+ PrevBitmapHole);
+ if (TftpBlock > ((Mapsize*8) - 1)) {
+ printf ("tftpfile too big\n");
+ /* try to double it and retry */
+ Mapsize<<=1;
+ mcast_cleanup();
+ NetStartAgain ();
+ return;
+ }
+ TftpLastBlock = TftpBlock;
+ }
+ }
+#endif
TftpSend ();
- if (len < TFTP_BLOCK_SIZE) {
+#ifdef CONFIG_MCAST_TFTP
+ if (Multicast) {
+ if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
+ puts ("\nMulticast tftp done\n");
+ mcast_cleanup();
+ NetState = NETLOOP_SUCCESS;
+ }
+ }
+ else
+#endif
+ if (len < TftpBlkSize) {
/*
* We received the whole thing. Try to
* run it.
@@ -290,6 +416,9 @@
printf ("\nTFTP error: '%s' (%d)\n",
pkt + 2, ntohs(*(ushort *)pkt));
puts ("Starting again\n\n");
+#ifdef CONFIG_MCAST_TFTP
+ mcast_cleanup();
+#endif
NetStartAgain ();
break;
}
@@ -301,6 +430,9 @@
{
if (++TftpTimeoutCount > TIMEOUT_COUNT) {
puts ("\nRetry count exceeded; starting again\n");
+#ifdef CONFIG_MCAST_TFTP
+ mcast_cleanup();
+#endif
NetStartAgain ();
} else {
puts ("T ");
@@ -370,6 +502,7 @@
TftpState = STATE_RRQ;
/* Use a pseudo-random port unless a specific port is set */
TftpOurPort = 1024 + (get_timer(0) % 3072);
+
#ifdef CONFIG_TFTP_PORT
if ((ep = getenv("tftpdstp")) != NULL) {
TftpServerPort = simple_strtol(ep, NULL, 10);
@@ -382,8 +515,103 @@
/* zero out server ether in case the server ip has changed */
memset(NetServerEther, 0, 6);
+ /* Revert TftpBlkSize to dflt */
+ TftpBlkSize = TFTP_BLOCK_SIZE;
+#ifdef CONFIG_MCAST_TFTP
+ mcast_cleanup();
+#endif
TftpSend ();
}
-#endif
+#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;
+ IPaddr_t addr;
+ char *mc_adr, *port, *mc;
+
+ mc_adr=port=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 (Multicast && MasterClient) {
+ printf ("I got a OACK as master Client, WRONG!\n");
+ return;
+ }
+ /* ..I now accept packets destined for this MCAST addr, port */
+ if (!Multicast) {
+ if (Bitmap) {
+ printf ("Internal failure! no mcast.\n");
+ free(Bitmap);
+ Bitmap=NULL;
+ ProhibitMcast=1;
+ return ;
+ }
+ /* I malloc instead of pre-declare; so that if the file ends
+ * up being too big for this bitmap I can retry
+ */
+ if (!(Bitmap = malloc (Mapsize))) {
+ printf ("No Bitmap, no multicast. Sorry.\n");
+ ProhibitMcast=1;
+ return;
+ }
+ memset (Bitmap,0,Mapsize);
+ PrevBitmapHole = 0;
+ Multicast = 1;
+ }
+ addr = string_to_ip(mc_adr);
+ if (Mcast_addr != addr) {
+ if (Mcast_addr)
+ eth_mcast_join(Mcast_addr, 0);
+ if (eth_mcast_join(Mcast_addr=addr, 1)) {
+ printf ("Fail to set mcast, revert to TFTP\n");
+ ProhibitMcast=1;
+ mcast_cleanup();
+ NetStartAgain();
+ }
+ }
+ MasterClient = (unsigned char)simple_strtoul((char *)mc,NULL,10);
+ Mcast_port = (unsigned short)simple_strtoul(port,NULL,10);
+ printf ("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
+ return;
+}
+
+#endif /* Multicast TFTP */
+
+#endif /* CFG_CMD_NET */