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[undi] Allow underlying PXE stack to construct link-layer header

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Some PXE stacks (observed with a QLogic 8242) will always try to
prepend a link-layer header, even if the caller uses P_UNKNOWN to
indicate that the link-layer header has already been filled in.  This
results in an invalid packet being transmitted.

Work around these faulty PXE stacks where possible by stripping the
existing link-layer header and allowing the PXE stack to (re)construct
the link-layer header itself.

Originally-fixed-by: Buck Huppmann <buckh@pobox.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2012-03-02 18:02:03 +00:00
parent 1d293776ea
commit 6324bd9389
3 changed files with 61 additions and 9 deletions
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13
src/net/ethernet.c
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@@ -50,9 +50,9 @@ static uint8_t eth_broadcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
* @v net_proto Network-layer protocol, in network-byte order
* @ret rc Return status code
*/
static int eth_push ( struct net_device *netdev __unused,
struct io_buffer *iobuf, const void *ll_dest,
const void *ll_source, uint16_t net_proto ) {
int eth_push ( struct net_device *netdev __unused, struct io_buffer *iobuf,
const void *ll_dest, const void *ll_source,
uint16_t net_proto ) {
struct ethhdr *ethhdr = iob_push ( iobuf, sizeof ( *ethhdr ) );
/* Build Ethernet header */
@@ -74,10 +74,9 @@ static int eth_push ( struct net_device *netdev __unused,
* @ret flags Packet flags
* @ret rc Return status code
*/
static int eth_pull ( struct net_device *netdev __unused,
struct io_buffer *iobuf, const void **ll_dest,
const void **ll_source, uint16_t *net_proto,
unsigned int *flags ) {
int eth_pull ( struct net_device *netdev __unused, struct io_buffer *iobuf,
const void **ll_dest, const void **ll_source,
uint16_t *net_proto, unsigned int *flags ) {
struct ethhdr *ethhdr = iobuf->data;
/* Sanity check */