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-rw-r--r--ext/dnet/arp.h103
1 files changed, 103 insertions, 0 deletions
diff --git a/ext/dnet/arp.h b/ext/dnet/arp.h
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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 */