1 files changed, 103 insertions, 0 deletions
diff --git a/ext/dnet/arp.h b/ext/dnet/arp.h
new file mode 100644
index 000000000..d3c162410
--- /dev/null
+++ b/ext/dnet/arp.h
@@ -0,0 +1,103 @@
+/*
+ * arp.h
+ *
+ * Address Resolution Protocol.
+ * RFC 826
+ *
+ * Copyright (c) 2000 Dug Song <dugsong@monkey.org>
+ *
+ * $Id: arp.h,v 1.12 2003/03/16 17:39:17 dugsong Exp $
+ */
+
+#ifndef DNET_ARP_H
+#define DNET_ARP_H
+
+#define ARP_HDR_LEN	8	/* base ARP header length */
+#define ARP_ETHIP_LEN	20	/* base ARP message length */
+
+#ifndef __GNUC__
+# define __attribute__(x)
+# pragma pack(1)
+#endif
+
+/*
+ * ARP header
+ */
+struct arp_hdr {
+        uint16_t	ar_hrd;	/* format of hardware address */
+        uint16_t	ar_pro;	/* format of protocol address */
+        uint8_t		ar_hln;	/* length of hardware address (ETH_ADDR_LEN) */
+        uint8_t		ar_pln;	/* length of protocol address (IP_ADDR_LEN) */
+        uint16_t	ar_op;	/* operation */
+};
+
+/*
+ * Hardware address format
+ */
+#define ARP_HRD_ETH 	0x0001	/* ethernet hardware */
+#define ARP_HRD_IEEE802	0x0006	/* IEEE 802 hardware */
+
+/*
+ * Protocol address format
+ */
+#define ARP_PRO_IP	0x0800	/* IP protocol */
+
+/*
+ * ARP operation
+ */
+#define	ARP_OP_REQUEST		1	/* request to resolve ha given pa */
+#define	ARP_OP_REPLY		2	/* response giving hardware address */
+#define	ARP_OP_REVREQUEST	3	/* request to resolve pa given ha */
+#define	ARP_OP_REVREPLY		4	/* response giving protocol address */
+
+/*
+ * Ethernet/IP ARP message
+ */
+struct arp_ethip {
+        uint8_t		ar_sha[ETH_ADDR_LEN];	/* sender hardware address */
+        uint8_t		ar_spa[IP_ADDR_LEN];	/* sender protocol address */
+        uint8_t		ar_tha[ETH_ADDR_LEN];	/* target hardware address */
+        uint8_t		ar_tpa[IP_ADDR_LEN];	/* target protocol address */
+};
+
+/*
+ * ARP cache entry
+ */
+struct arp_entry {
+        struct addr	arp_pa;			/* protocol address */
+        struct addr	arp_ha;			/* hardware address */
+};
+
+#ifndef __GNUC__
+# pragma pack()
+#endif
+
+#define arp_pack_hdr_ethip(hdr, op, sha, spa, tha, tpa) do {	\
+        struct arp_hdr *pack_arp_p = (struct arp_hdr *)(hdr);	\
+        struct arp_ethip *pack_ethip_p = (struct arp_ethip *)	\
+                ((uint8_t *)(hdr) + ARP_HDR_LEN);		\
+        pack_arp_p->ar_hrd = htons(ARP_HRD_ETH);		\
+        pack_arp_p->ar_pro = htons(ARP_PRO_IP);			\
+        pack_arp_p->ar_hln = ETH_ADDR_LEN;			\
+        pack_arp_p->ar_pln = IP_ADDR_LEN;			\
+        pack_arp_p->ar_op = htons(op);				\
+        memmove(pack_ethip_p->ar_sha, &(sha), ETH_ADDR_LEN);	\
+        memmove(pack_ethip_p->ar_spa, &(spa), IP_ADDR_LEN);	\
+        memmove(pack_ethip_p->ar_tha, &(tha), ETH_ADDR_LEN);	\
+        memmove(pack_ethip_p->ar_tpa, &(tpa), IP_ADDR_LEN);	\
+} while (0)
+
+typedef struct arp_handle arp_t;
+
+typedef int (*arp_handler)(const struct arp_entry *entry, void *arg);
+
+__BEGIN_DECLS
+arp_t	*arp_open(void);
+int	 arp_add(arp_t *arp, const struct arp_entry *entry);
+int	 arp_delete(arp_t *arp, const struct arp_entry *entry);
+int	 arp_get(arp_t *arp, struct arp_entry *entry);
+int	 arp_loop(arp_t *arp, arp_handler callback, void *arg);
+arp_t	*arp_close(arp_t *arp);
+__END_DECLS
+
+#endif /* DNET_ARP_H */