2 files changed, 77 insertions, 0 deletions
diff --git a/src/include/ipxe/errfile.h b/src/include/ipxe/errfile.h
index d217eea04..97d55573c 100644
--- a/src/include/ipxe/errfile.h
+++ b/src/include/ipxe/errfile.h
@@ -243,6 +243,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #define ERRFILE_nfs_uri			( ERRFILE_NET | 0x003c0000 )
 #define ERRFILE_rndis			( ERRFILE_NET | 0x003d0000 )
 #define ERRFILE_pccrc			( ERRFILE_NET | 0x003e0000 )
+#define ERRFILE_stp			( ERRFILE_NET | 0x003f0000 )
 
 #define ERRFILE_image		      ( ERRFILE_IMAGE | 0x00000000 )
 #define ERRFILE_elf		      ( ERRFILE_IMAGE | 0x00010000 )
diff --git a/src/include/ipxe/stp.h b/src/include/ipxe/stp.h
new file mode 100644
index 000000000..3d85e5ba4
--- /dev/null
+++ b/src/include/ipxe/stp.h
@@ -0,0 +1,76 @@
+#ifndef _IPXE_STP_H
+#define _IPXE_STP_H
+
+/** @file
+ *
+ * Spanning Tree Protocol (STP)
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+#include <ipxe/if_ether.h>
+
+/** "Protocol" value for STP
+ *
+ * This is the concatenated {DSAP,SSAP} value used internally by iPXE
+ * as the network-layer protocol for LLC frames.
+ */
+#define ETH_P_STP 0x4242
+
+/** A switch identifier */
+struct stp_switch {
+	/** Priotity */
+	uint16_t priority;
+	/** MAC address */
+	uint8_t mac[ETH_ALEN];
+} __attribute__ (( packed ));
+
+/** A Spanning Tree bridge protocol data unit */
+struct stp_bpdu {
+	/** LLC DSAP */
+	uint8_t dsap;
+	/** LLC SSAP */
+	uint8_t ssap;
+	/** LLC control field */
+	uint8_t control;
+	/** Protocol ID */
+	uint16_t protocol;
+	/** Protocol version */
+	uint8_t version;
+	/** Message type */
+	uint8_t type;
+	/** Flags */
+	uint8_t flags;
+	/** Root switch */
+	struct stp_switch root;
+	/** Root path cost */
+	uint32_t cost;
+	/** Sender switch */
+	struct stp_switch sender;
+	/** Port */
+	uint16_t port;
+	/** Message age */
+	uint16_t age;
+	/** Maximum age */
+	uint16_t max;
+	/** Hello time */
+	uint16_t hello;
+	/** Forward delay */
+	uint16_t delay;
+} __attribute__ (( packed ));
+
+/** Spanning Tree protocol ID */
+#define STP_PROTOCOL 0x0000
+
+/** Rapid Spanning Tree protocol version */
+#define STP_VERSION_RSTP 0x02
+
+/** Rapid Spanning Tree bridge PDU type */
+#define STP_TYPE_RSTP 0x02
+
+/** Port is forwarding */
+#define STP_FL_FORWARDING 0x20
+
+#endif /* _IPXE_STP_H */