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>

1 files changed, 45 insertions, 0 deletions

diff --git a/net/eth.c b/net/eth.c
index c8f92a5..9ccbcca 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -353,6 +353,51 @@ void eth_set_enetaddr(int num, char *addr) {
 
 	memcpy(dev->enetaddr, enetaddr, 6);
 }
+#ifdef CONFIG_MCAST_TFTP
+/* Multicast.
+ * mcast_addr: multicast ipaddr from which multicast Mac is made
+ * join: 1=join, 0=leave.  
+ */
+int eth_mcast_join( IPaddr_t mcast_ip, u8 join)
+{
+ u8 mcast_mac[6];
+	if (!eth_current || !eth_current->mcast) 
+		return -1;
+	mcast_mac[5] = htonl(mcast_ip) & 0xff;
+	mcast_mac[4] = (htonl(mcast_ip)>>8) & 0xff;
+	mcast_mac[3] = (htonl(mcast_ip)>>16) & 0x7f;
+	mcast_mac[2] = 0x5e;
+	mcast_mac[1] = 0x0;
+	mcast_mac[0] = 0x1;
+	return eth_current->mcast(eth_current, mcast_mac, join);
+}
+
+/* the 'way' for ethernet-CRC-32. Spliced in from Linux lib/crc32.c 
+ * and this is the ethernet-crc method needed for TSEC -- and perhaps 
+ * some other adapter -- hash tables
+ */
+#define CRCPOLY_LE 0xedb88320
+u32 ether_crc (size_t len, unsigned char const *p)
+{
+	int i;
+	u32 crc;
+	crc = ~0;
+	while (len--) {
+		crc ^= *p++;
+		for (i = 0; i < 8; i++)
+			crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
+	}
+	/* an reverse the bits, cuz of way they arrive -- last-first */
+	crc = (crc >> 16) | (crc << 16);
+	crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);
+	crc = (crc >> 4 & 0x0f0f0f0f) | (crc << 4 & 0xf0f0f0f0);
+	crc = (crc >> 2 & 0x33333333) | (crc << 2 & 0xcccccccc);
+	crc = (crc >> 1 & 0x55555555) | (crc << 1 & 0xaaaaaaaa);
+	return crc;
+}
+
+#endif
+
 
 int eth_init(bd_t *bis)
 {