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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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8
src/include/ipxe/ethernet.h
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@@ -10,6 +10,8 @@
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <ipxe/netdevice.h>
#include <ipxe/iobuf.h>
/**
* Check if Ethernet address is all zeroes
@@ -77,6 +79,12 @@ static inline int is_valid_ether_addr ( const void *addr ) {
( ! is_zero_ether_addr ( addr ) ) );
}
extern int eth_push ( struct net_device *netdev, struct io_buffer *iobuf,
const void *ll_dest, const void *ll_source,
uint16_t net_proto );
extern int eth_pull ( struct net_device *netdev, struct io_buffer *iobuf,
const void **ll_dest, const void **ll_source,
uint16_t *net_proto, unsigned int *flags );
extern void eth_init_addr ( const void *hw_addr, void *ll_addr );
extern const char * eth_ntoa ( const void *ll_addr );
extern int eth_mc_hash ( unsigned int af, const void *net_addr,