From 170bbfd4875b2a3479101b5f5892cdedcf857fd0 Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Tue, 26 Mar 2024 15:16:33 +0000 Subject: [efi] Add efi_path_mac() to parse a MAC address from an EFI device path Signed-off-by: Michael Brown --- src/include/ipxe/efi/efi_path.h | 1 + src/interface/efi/efi_path.c | 24 ++++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/src/include/ipxe/efi/efi_path.h b/src/include/ipxe/efi/efi_path.h index 503bd43..57fce40 100644 --- a/src/include/ipxe/efi/efi_path.h +++ b/src/include/ipxe/efi/efi_path.h @@ -43,6 +43,7 @@ efi_path_prev ( EFI_DEVICE_PATH_PROTOCOL *path, extern EFI_DEVICE_PATH_PROTOCOL * efi_path_end ( EFI_DEVICE_PATH_PROTOCOL *path ); extern size_t efi_path_len ( EFI_DEVICE_PATH_PROTOCOL *path ); +extern void * efi_path_mac ( EFI_DEVICE_PATH_PROTOCOL *path ); extern unsigned int efi_path_vlan ( EFI_DEVICE_PATH_PROTOCOL *path ); extern int efi_path_guid ( EFI_DEVICE_PATH_PROTOCOL *path, union uuid *uuid ); extern struct uri * efi_path_uri ( EFI_DEVICE_PATH_PROTOCOL *path ); diff --git a/src/interface/efi/efi_path.c b/src/interface/efi/efi_path.c index 4e37d24..23f1bb8 100644 --- a/src/interface/efi/efi_path.c +++ b/src/interface/efi/efi_path.c @@ -112,6 +112,30 @@ size_t efi_path_len ( EFI_DEVICE_PATH_PROTOCOL *path ) { } /** + * Get MAC address from device path + * + * @v path Device path + * @ret mac MAC address, or NULL if not found + */ +void * efi_path_mac ( EFI_DEVICE_PATH_PROTOCOL *path ) { + EFI_DEVICE_PATH_PROTOCOL *next; + MAC_ADDR_DEVICE_PATH *mac; + + /* Search for MAC address path */ + for ( ; ( next = efi_path_next ( path ) ) ; path = next ) { + if ( ( path->Type == MESSAGING_DEVICE_PATH ) && + ( path->SubType == MSG_MAC_ADDR_DP ) ) { + mac = container_of ( path, MAC_ADDR_DEVICE_PATH, + Header ); + return &mac->MacAddress; + } + } + + /* No MAC address found */ + return NULL; +} + +/** * Get VLAN tag from device path * * @v path Device path -- cgit v1.1