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[netdevice] Split multicast hashing out into an mc_hash method

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Multicast hashing is an ugly overlap between network and link layers.
EFI requires us to provide access to this functionality, so move it
out of ipv4.c and expose it as a method of the link layer.
This commit is contained in:
Michael Brown
2008-10-15 02:00:44 +01:00
parent 832668105e
commit 6b9cc25556
4 changed files with 57 additions and 14 deletions
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src/net/ipv4.c
+1 -12
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@@ -266,7 +266,6 @@ static uint16_t ipv4_pshdr_chksum ( struct io_buffer *iobuf, uint16_t csum ) {
static int ipv4_ll_addr ( struct in_addr dest, struct in_addr src,
struct net_device *netdev, uint8_t *ll_dest ) {
struct ll_protocol *ll_protocol = netdev->ll_protocol;
uint8_t *dest_bytes = ( ( uint8_t * ) &dest );
if ( dest.s_addr == INADDR_BROADCAST ) {
/* Broadcast address */
@@ -274,17 +273,7 @@ static int ipv4_ll_addr ( struct in_addr dest, struct in_addr src,
ll_protocol->ll_addr_len );
return 0;
} else if ( IN_MULTICAST ( ntohl ( dest.s_addr ) ) ) {
/* Special case: IPv4 multicast over Ethernet. This
* code may need to be generalised once we find out
* what happens for other link layers.
*/
ll_dest[0] = 0x01;
ll_dest[1] = 0x00;
ll_dest[2] = 0x5e;
ll_dest[3] = dest_bytes[1] & 0x7f;
ll_dest[4] = dest_bytes[2];
ll_dest[5] = dest_bytes[3];
return 0;
return ll_protocol->mc_hash ( AF_INET, &dest, ll_dest );
} else {
/* Unicast address: resolve via ARP */
return arp_resolve ( netdev, &ipv4_protocol, &dest,