1 /* $NetBSD: if_ether.h,v 1.43 2006/11/24 01:04:30 rpaulo Exp $ */
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31 * @(#)if_ether.h 8.1 (Berkeley) 6/10/93
34 #ifndef _NET_IF_ETHER_H_
35 #define _NET_IF_ETHER_H_
39 #include "opt_mbuftrace.h"
45 * Some basic Ethernet constants.
47 #define ETHER_ADDR_LEN 6 /* length of an Ethernet address */
48 #define ETHER_TYPE_LEN 2 /* length of the Ethernet type field */
49 #define ETHER_CRC_LEN 4 /* length of the Ethernet CRC */
50 #define ETHER_HDR_LEN ((ETHER_ADDR_LEN * 2) + ETHER_TYPE_LEN)
51 #define ETHER_MIN_LEN 64 /* minimum frame length, including CRC */
52 #define ETHER_MAX_LEN 1518 /* maximum frame length, including CRC */
53 #define ETHER_MAX_LEN_JUMBO 9018 /* maximum jumbo frame len, including CRC */
56 * Some Ethernet extensions.
58 #define ETHER_VLAN_ENCAP_LEN 4 /* length of 802.1Q VLAN encapsulation */
61 * Ethernet address - 6 octets
62 * this is only used by the ethers(3) functions.
65 u_int8_t ether_addr_octet[ETHER_ADDR_LEN];
66 } __attribute__((__packed__));
69 * Structure of a 10Mb/s Ethernet header.
72 u_int8_t ether_dhost[ETHER_ADDR_LEN];
73 u_int8_t ether_shost[ETHER_ADDR_LEN];
75 } __attribute__((__packed__));
77 #include <net/ethertypes.h>
79 #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */
81 #define ETHERMTU_JUMBO (ETHER_MAX_LEN_JUMBO - ETHER_HDR_LEN - ETHER_CRC_LEN)
82 #define ETHERMTU (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
83 #define ETHERMIN (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
86 * Compute the maximum frame size based on ethertype (i.e. possible
87 * encapsulation) and whether or not an FCS is present.
89 #define ETHER_MAX_FRAME(ifp, etype, hasfcs) \
90 ((ifp)->if_mtu + ETHER_HDR_LEN + \
91 ((hasfcs) ? ETHER_CRC_LEN : 0) + \
92 (((etype) == ETHERTYPE_VLAN) ? ETHER_VLAN_ENCAP_LEN : 0))
95 * Ethernet CRC32 polynomials (big- and little-endian verions).
97 #define ETHER_CRC_POLY_LE 0xedb88320
98 #define ETHER_CRC_POLY_BE 0x04c11db6
103 * Ethernet-specific mbuf flags.
105 #define M_HASFCS M_LINK0 /* FCS included at end of frame */
106 #define M_PROMISC M_LINK1 /* this packet is not for us */
110 * Macro to map an IP multicast address to an Ethernet multicast address.
111 * The high-order 25 bits of the Ethernet address are statically assigned,
112 * and the low-order 23 bits are taken from the low end of the IP address.
114 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
115 /* struct in_addr *ipaddr; */ \
116 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \
118 (enaddr)[0] = 0x01; \
119 (enaddr)[1] = 0x00; \
120 (enaddr)[2] = 0x5e; \
121 (enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \
122 (enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \
123 (enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \
126 * Macro to map an IP6 multicast address to an Ethernet multicast address.
127 * The high-order 16 bits of the Ethernet address are statically assigned,
128 * and the low-order 32 bits are taken from the low end of the IP6 address.
130 #define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \
131 /* struct in6_addr *ip6addr; */ \
132 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \
134 (enaddr)[0] = 0x33; \
135 (enaddr)[1] = 0x33; \
136 (enaddr)[2] = ((u_int8_t *)ip6addr)[12]; \
137 (enaddr)[3] = ((u_int8_t *)ip6addr)[13]; \
138 (enaddr)[4] = ((u_int8_t *)ip6addr)[14]; \
139 (enaddr)[5] = ((u_int8_t *)ip6addr)[15]; \
143 #define ETHERCAP_VLAN_MTU 0x00000001 /* VLAN-compatible MTU */
144 #define ETHERCAP_VLAN_HWTAGGING 0x00000002 /* hardware VLAN tag support */
145 #define ETHERCAP_JUMBO_MTU 0x00000004 /* 9000 byte MTU supported */
148 extern const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN];
149 extern const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN];
150 extern const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN];
151 extern const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN];
153 int ether_ioctl(struct ifnet *, u_long, caddr_t);
154 int ether_addmulti (struct ifreq *, struct ethercom *);
155 int ether_delmulti (struct ifreq *, struct ethercom *);
156 int ether_changeaddr (struct ifreq *, struct ethercom *);
157 int ether_multiaddr(struct sockaddr *, u_int8_t[], u_int8_t[]);
160 * Ethernet 802.1Q VLAN structures.
163 /* add VLAN tag to input/received packet */
164 #define VLAN_INPUT_TAG(ifp, m, vlanid, _errcase) \
166 struct m_tag *mtag = \
167 m_tag_get(PACKET_TAG_VLAN, sizeof(u_int), M_NOWAIT);\
168 if (mtag == NULL) { \
170 printf("%s: unable to allocate VLAN tag\n", \
175 *(u_int *)(mtag + 1) = vlanid; \
176 m_tag_prepend(m, mtag); \
179 /* extract VLAN tag from output/trasmit packet */
180 #define VLAN_OUTPUT_TAG(ec, m0) \
181 VLAN_ATTACHED(ec) ? m_tag_find((m0), PACKET_TAG_VLAN, NULL) : NULL
183 /* extract VLAN ID value from a VLAN tag */
184 #define VLAN_TAG_VALUE(mtag) \
185 ((*(u_int *)(mtag + 1)) & 4095)
187 /* test if any VLAN is configured for this interface */
188 #define VLAN_ATTACHED(ec) ((ec)->ec_nvlans > 0)
190 void ether_ifattach(struct ifnet *, const u_int8_t *);
191 void ether_ifdetach(struct ifnet *);
193 char *ether_sprintf(const u_int8_t *);
194 char *ether_snprintf(char *, size_t, const u_int8_t *);
196 u_int32_t ether_crc32_le(const u_int8_t *, size_t);
197 u_int32_t ether_crc32_be(const u_int8_t *, size_t);
199 int ether_nonstatic_aton(u_char *, char *);
202 * Prototype ethers(3) functions.
204 #include <sys/cdefs.h>
206 char * ether_ntoa __P((const struct ether_addr *));
208 ether_aton __P((const char *));
209 int ether_ntohost __P((char *, const struct ether_addr *));
210 int ether_hostton __P((const char *, struct ether_addr *));
211 int ether_line __P((const char *, struct ether_addr *, char *));
215 #endif /* _STANDALONE */
217 #endif /* !_NET_IF_ETHER_H_ */