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net/drivers/efi/efinet: Skip virtual VLAN devices during card enumeration

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Similarly to the issue described in commit c52ae4057 (efinet: skip
virtual IPv4 and IPv6 devices during card enumeration) the UEFI PXE
driver creates additional VLAN child devices when a VLAN ID is
configured on a network interface associated with a physical NIC. These
virtual VLAN devices must be skipped during card enumeration to ensure
that the subsequent SNP exclusive open operation targets the correct
physical card instances. Otherwise packet transfer would fail.

A device path example with VLAN nodes:

  /MAC(123456789ABC,0x1)/Vlan(20)/IPv4(0.0.0.0,0x0,DHCP,0.0.0.0,0.0.0.0,0.0.0.0)

Signed-off-by: Michael Chang <mchang@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Michael Chang authored and Daniel Kiper committed 2024-10-10 12:38:47 +02:00
1 parent e5f047be05
commit 3808b1a9bd
1 file changed
+11 -1
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grub-core/net/drivers/efi/efinet.c
+11 -1
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@@ -276,7 +276,8 @@ grub_efinet_findcards (void)
|| GRUB_EFI_DEVICE_PATH_SUBTYPE (child) == GRUB_EFI_IPV6_DEVICE_PATH_SUBTYPE)
&& parent
&& GRUB_EFI_DEVICE_PATH_TYPE (parent) == GRUB_EFI_MESSAGING_DEVICE_PATH_TYPE
&& GRUB_EFI_DEVICE_PATH_SUBTYPE (parent) == GRUB_EFI_MAC_ADDRESS_DEVICE_PATH_SUBTYPE)
&& (GRUB_EFI_DEVICE_PATH_SUBTYPE (parent) == GRUB_EFI_MAC_ADDRESS_DEVICE_PATH_SUBTYPE
|| GRUB_EFI_DEVICE_PATH_SUBTYPE (parent) == GRUB_EFI_VLAN_DEVICE_PATH_SUBTYPE))
continue;
net = grub_efi_open_protocol (*handle, &net_io_guid,
@@ -389,6 +390,15 @@ grub_efi_net_config_real (grub_efi_handle_t hnd, char **device,
dup_ldp->type = GRUB_EFI_END_DEVICE_PATH_TYPE;
dup_ldp->subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
dup_ldp->length = sizeof (*dup_ldp);
dup_ldp = grub_efi_find_last_device_path (dup_dp);
if (GRUB_EFI_DEVICE_PATH_SUBTYPE (dup_ldp) == GRUB_EFI_VLAN_DEVICE_PATH_SUBTYPE)
{
dup_ldp->type = GRUB_EFI_END_DEVICE_PATH_TYPE;
dup_ldp->subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
dup_ldp->length = sizeof (*dup_ldp);
}
match = grub_efi_compare_device_paths (dup_dp, cdp) == 0;
grub_free (dup_dp);
if (!match)