Moved if_ether.h and if_arp.h to include/gpxe, for consistency with Linux

kernel.

Removed obsolete struct arprequest from if_arp.h and put it in nic.c so
that nic.c will still compile.  ARP will very shortly be handled by
net/arp.c instead.

src/include/gpxe/if_arp.h

@@ -0,0 +1,100 @@
+#ifndef	_IF_ARP_H
+#define	_IF_ARP_H
+
+/** @file
+ *
+ * Address Resolution Protocol constants and types
+ *
+ */
+
+#include <stdint.h>
+
+/* ARP protocol HARDWARE identifiers. */
+#define ARPHRD_NETROM	0		/**< from KA9Q: NET/ROM pseudo	*/
+#define ARPHRD_ETHER 	1		/**< Ethernet 10Mbps		*/
+#define	ARPHRD_EETHER	2		/**< Experimental Ethernet	*/
+#define	ARPHRD_AX25	3		/**< AX.25 Level 2		*/
+#define	ARPHRD_PRONET	4		/**< PROnet token ring		*/
+#define	ARPHRD_CHAOS	5		/**< Chaosnet			*/
+#define	ARPHRD_IEEE802	6		/**< IEEE 802.2 Ethernet/TR/TB	*/
+#define	ARPHRD_ARCNET	7		/**< ARCnet			*/
+#define	ARPHRD_APPLETLK	8		/**< APPLEtalk			*/
+#define ARPHRD_DLCI	15		/**< Frame Relay DLCI		*/
+#define ARPHRD_ATM	19		/**< ATM 			*/
+#define ARPHRD_METRICOM	23		/**< Metricom STRIP (new IANA id) */
+#define	ARPHRD_IEEE1394	24		/**< IEEE 1394 IPv4 - RFC 2734	*/
+#define ARPHRD_EUI64	27		/**< EUI-64			*/
+#define ARPHRD_INFINIBAND 32		/**< InfiniBand			*/
+
+/* ARP protocol opcodes. */
+#define	ARPOP_REQUEST	1		/**< ARP request		*/
+#define	ARPOP_REPLY	2		/**< ARP reply			*/
+#define	ARPOP_RREQUEST	3		/**< RARP request		*/
+#define	ARPOP_RREPLY	4		/**< RARP reply			*/
+#define	ARPOP_InREQUEST	8		/**< InARP request		*/
+#define	ARPOP_InREPLY	9		/**< InARP reply		*/
+#define	ARPOP_NAK	10		/**< (ATM)ARP NAK		*/
+
+/**
+ * An ARP header
+ *
+ * This contains only the fixed-size portions of an ARP header; for
+ * other fields use the arp_{sender,target}_{ha,pa} family of
+ * functions.
+ */
+struct arphdr {
+	/** Link-layer protocol
+	 *
+	 * This is an ARPHRD_XXX constant
+	 */
+	uint16_t ar_hrd;
+	/** Network-layer protocol
+	 *
+	 * This is, for Ethernet, an ETH_P_XXX constant.
+	 */
+	uint16_t ar_pro;
+	/** Link-layer address length */
+	uint8_t ar_hln;
+	/** Network-layer address length */
+	uint8_t ar_pln;
+	/** ARP opcode */
+	uint16_t ar_op;
+} __attribute__ (( packed ));
+
+/** ARP packet sender hardware address
+ *
+ * @v arphdr	ARP header
+ * @ret ar_sha	Sender hardware address
+ */
+static inline void * arp_sender_ha ( struct arphdr *arphdr ) {
+	return ( ( ( void * ) arphdr ) + sizeof ( *arphdr ) );
+}
+
+/** ARP packet sender protocol address
+ *
+ * @v arphdr	ARP header
+ * @ret ar_spa	Sender protocol address
+ */
+static inline void * arp_sender_pa ( struct arphdr *arphdr ) {
+	return ( arp_sender_ha ( arphdr ) + arphdr->ar_hln );
+}
+
+/** ARP packet target hardware address
+ *
+ * @v arphdr	ARP header
+ * @ret ar_tha	Target hardware address
+ */
+static inline void * arp_target_ha ( struct arphdr *arphdr ) {
+	return ( arp_sender_pa ( arphdr ) + arphdr->ar_pln );
+}
+
+/** ARP packet target protocol address
+ *
+ * @v arphdr	ARP header
+ * @ret ar_tpa	Target protocol address
+ */
+static inline void * arp_target_pa ( struct arphdr *arphdr ) {
+	return ( arp_target_ha ( arphdr ) + arphdr->ar_hln );
+}
+
+#endif	/* _IF_ARP_H */