Initial Contribution
diff --git a/libc/include/net/if_ether.h b/libc/include/net/if_ether.h
new file mode 100644
index 0000000..121f9ac
--- /dev/null
+++ b/libc/include/net/if_ether.h
@@ -0,0 +1,217 @@
+/* $NetBSD: if_ether.h,v 1.43 2006/11/24 01:04:30 rpaulo Exp $ */
+
+/*
+ * Copyright (c) 1982, 1986, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)if_ether.h 8.1 (Berkeley) 6/10/93
+ */
+
+#ifndef _NET_IF_ETHER_H_
+#define _NET_IF_ETHER_H_
+
+#ifdef _KERNEL
+#ifdef _KERNEL_OPT
+#include "opt_mbuftrace.h"
+#endif
+#include <sys/mbuf.h>
+#endif
+
+/*
+ * Some basic Ethernet constants.
+ */
+#define ETHER_ADDR_LEN 6 /* length of an Ethernet address */
+#define ETHER_TYPE_LEN 2 /* length of the Ethernet type field */
+#define ETHER_CRC_LEN 4 /* length of the Ethernet CRC */
+#define ETHER_HDR_LEN ((ETHER_ADDR_LEN * 2) + ETHER_TYPE_LEN)
+#define ETHER_MIN_LEN 64 /* minimum frame length, including CRC */
+#define ETHER_MAX_LEN 1518 /* maximum frame length, including CRC */
+#define ETHER_MAX_LEN_JUMBO 9018 /* maximum jumbo frame len, including CRC */
+
+/*
+ * Some Ethernet extensions.
+ */
+#define ETHER_VLAN_ENCAP_LEN 4 /* length of 802.1Q VLAN encapsulation */
+
+/*
+ * Ethernet address - 6 octets
+ * this is only used by the ethers(3) functions.
+ */
+struct ether_addr {
+ u_int8_t ether_addr_octet[ETHER_ADDR_LEN];
+} __attribute__((__packed__));
+
+/*
+ * Structure of a 10Mb/s Ethernet header.
+ */
+struct ether_header {
+ u_int8_t ether_dhost[ETHER_ADDR_LEN];
+ u_int8_t ether_shost[ETHER_ADDR_LEN];
+ u_int16_t ether_type;
+} __attribute__((__packed__));
+
+#include <net/ethertypes.h>
+
+#define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */
+
+#define ETHERMTU_JUMBO (ETHER_MAX_LEN_JUMBO - ETHER_HDR_LEN - ETHER_CRC_LEN)
+#define ETHERMTU (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
+#define ETHERMIN (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
+
+/*
+ * Compute the maximum frame size based on ethertype (i.e. possible
+ * encapsulation) and whether or not an FCS is present.
+ */
+#define ETHER_MAX_FRAME(ifp, etype, hasfcs) \
+ ((ifp)->if_mtu + ETHER_HDR_LEN + \
+ ((hasfcs) ? ETHER_CRC_LEN : 0) + \
+ (((etype) == ETHERTYPE_VLAN) ? ETHER_VLAN_ENCAP_LEN : 0))
+
+/*
+ * Ethernet CRC32 polynomials (big- and little-endian verions).
+ */
+#define ETHER_CRC_POLY_LE 0xedb88320
+#define ETHER_CRC_POLY_BE 0x04c11db6
+
+#ifndef _STANDALONE
+
+/*
+ * Ethernet-specific mbuf flags.
+ */
+#define M_HASFCS M_LINK0 /* FCS included at end of frame */
+#define M_PROMISC M_LINK1 /* this packet is not for us */
+
+#ifdef _KERNEL
+/*
+ * Macro to map an IP multicast address to an Ethernet multicast address.
+ * The high-order 25 bits of the Ethernet address are statically assigned,
+ * and the low-order 23 bits are taken from the low end of the IP address.
+ */
+#define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
+ /* struct in_addr *ipaddr; */ \
+ /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \
+{ \
+ (enaddr)[0] = 0x01; \
+ (enaddr)[1] = 0x00; \
+ (enaddr)[2] = 0x5e; \
+ (enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \
+ (enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \
+ (enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \
+}
+/*
+ * Macro to map an IP6 multicast address to an Ethernet multicast address.
+ * The high-order 16 bits of the Ethernet address are statically assigned,
+ * and the low-order 32 bits are taken from the low end of the IP6 address.
+ */
+#define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \
+ /* struct in6_addr *ip6addr; */ \
+ /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \
+{ \
+ (enaddr)[0] = 0x33; \
+ (enaddr)[1] = 0x33; \
+ (enaddr)[2] = ((u_int8_t *)ip6addr)[12]; \
+ (enaddr)[3] = ((u_int8_t *)ip6addr)[13]; \
+ (enaddr)[4] = ((u_int8_t *)ip6addr)[14]; \
+ (enaddr)[5] = ((u_int8_t *)ip6addr)[15]; \
+}
+#endif
+
+#define ETHERCAP_VLAN_MTU 0x00000001 /* VLAN-compatible MTU */
+#define ETHERCAP_VLAN_HWTAGGING 0x00000002 /* hardware VLAN tag support */
+#define ETHERCAP_JUMBO_MTU 0x00000004 /* 9000 byte MTU supported */
+
+#ifdef _KERNEL
+extern const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN];
+extern const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN];
+extern const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN];
+extern const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN];
+
+int ether_ioctl(struct ifnet *, u_long, caddr_t);
+int ether_addmulti (struct ifreq *, struct ethercom *);
+int ether_delmulti (struct ifreq *, struct ethercom *);
+int ether_changeaddr (struct ifreq *, struct ethercom *);
+int ether_multiaddr(struct sockaddr *, u_int8_t[], u_int8_t[]);
+
+/*
+ * Ethernet 802.1Q VLAN structures.
+ */
+
+/* add VLAN tag to input/received packet */
+#define VLAN_INPUT_TAG(ifp, m, vlanid, _errcase) \
+ do { \
+ struct m_tag *mtag = \
+ m_tag_get(PACKET_TAG_VLAN, sizeof(u_int), M_NOWAIT);\
+ if (mtag == NULL) { \
+ ifp->if_ierrors++; \
+ printf("%s: unable to allocate VLAN tag\n", \
+ ifp->if_xname); \
+ m_freem(m); \
+ _errcase; \
+ } \
+ *(u_int *)(mtag + 1) = vlanid; \
+ m_tag_prepend(m, mtag); \
+ } while(0)
+
+/* extract VLAN tag from output/trasmit packet */
+#define VLAN_OUTPUT_TAG(ec, m0) \
+ VLAN_ATTACHED(ec) ? m_tag_find((m0), PACKET_TAG_VLAN, NULL) : NULL
+
+/* extract VLAN ID value from a VLAN tag */
+#define VLAN_TAG_VALUE(mtag) \
+ ((*(u_int *)(mtag + 1)) & 4095)
+
+/* test if any VLAN is configured for this interface */
+#define VLAN_ATTACHED(ec) ((ec)->ec_nvlans > 0)
+
+void ether_ifattach(struct ifnet *, const u_int8_t *);
+void ether_ifdetach(struct ifnet *);
+
+char *ether_sprintf(const u_int8_t *);
+char *ether_snprintf(char *, size_t, const u_int8_t *);
+
+u_int32_t ether_crc32_le(const u_int8_t *, size_t);
+u_int32_t ether_crc32_be(const u_int8_t *, size_t);
+
+int ether_nonstatic_aton(u_char *, char *);
+#else
+/*
+ * Prototype ethers(3) functions.
+ */
+#include <sys/cdefs.h>
+__BEGIN_DECLS
+char * ether_ntoa __P((const struct ether_addr *));
+struct ether_addr *
+ ether_aton __P((const char *));
+int ether_ntohost __P((char *, const struct ether_addr *));
+int ether_hostton __P((const char *, struct ether_addr *));
+int ether_line __P((const char *, struct ether_addr *, char *));
+__END_DECLS
+#endif
+
+#endif /* _STANDALONE */
+
+#endif /* !_NET_IF_ETHER_H_ */