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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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32
src/net/ethernet.c
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@@ -24,6 +24,7 @@
#include <assert.h>
#include <gpxe/if_arp.h>
#include <gpxe/if_ether.h>
#include <gpxe/in.h>
#include <gpxe/netdevice.h>
#include <gpxe/iobuf.h>
#include <gpxe/ethernet.h>
@@ -92,8 +93,8 @@ static int eth_pull ( struct io_buffer *iobuf,
/**
* Transcribe Ethernet address
*
* @v ll_addr Link-layer address
* @ret string Link-layer address in human-readable format
* @v ll_addr Link-layer address
* @ret string Link-layer address in human-readable format
*/
const char * eth_ntoa ( const void *ll_addr ) {
static char buf[18]; /* "00:00:00:00:00:00" */
@@ -105,6 +106,32 @@ const char * eth_ntoa ( const void *ll_addr ) {
return buf;
}
/**
* Hash multicast address
*
* @v af Address family
* @v net_addr Network-layer address
* @v ll_addr Link-layer address to fill in
* @ret rc Return status code
*/
static int eth_mc_hash ( unsigned int af, const void *net_addr,
void *ll_addr ) {
const uint8_t *net_addr_bytes = net_addr;
uint8_t *ll_addr_bytes = ll_addr;
switch ( af ) {
case AF_INET:
ll_addr_bytes[0] = 0x01;
ll_addr_bytes[1] = 0x00;
ll_addr_bytes[2] = 0x5e;
ll_addr_bytes[3] = net_addr_bytes[1] & 0x7f;
ll_addr_bytes[4] = net_addr_bytes[2];
ll_addr_bytes[5] = net_addr_bytes[3];
default:
return -ENOTSUP;
}
}
/** Ethernet protocol */
struct ll_protocol ethernet_protocol __ll_protocol = {
.name = "Ethernet",
@@ -115,4 +142,5 @@ struct ll_protocol ethernet_protocol __ll_protocol = {
.push = eth_push,
.pull = eth_pull,
.ntoa = eth_ntoa,
.mc_hash = eth_mc_hash,
};