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