1 /* 2 * Fundamental constants relating to ethernet. 3 * 4 * $FreeBSD$ 5 * 6 */ 7 8 #ifndef _NET_ETHERNET_H_ 9 #define _NET_ETHERNET_H_ 10 11 /* 12 * The number of bytes in an ethernet (MAC) address. 13 */ 14 #define ETHER_ADDR_LEN 6 15 16 /* 17 * The number of bytes in the type field. 18 */ 19 #define ETHER_TYPE_LEN 2 20 21 /* 22 * The number of bytes in the trailing CRC field. 23 */ 24 #define ETHER_CRC_LEN 4 25 26 /* 27 * The length of the combined header. 28 */ 29 #define ETHER_HDR_LEN (ETHER_ADDR_LEN*2+ETHER_TYPE_LEN) 30 31 /* 32 * The minimum packet length. 33 */ 34 #define ETHER_MIN_LEN 64 35 36 /* 37 * The maximum packet length. 38 */ 39 #define ETHER_MAX_LEN 1518 40 41 /* 42 * A macro to validate a length with 43 */ 44 #define ETHER_IS_VALID_LEN(foo) \ 45 ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN) 46 47 /* 48 * Structure of a 10Mb/s Ethernet header. 49 */ 50 struct ether_header { 51 u_char ether_dhost[ETHER_ADDR_LEN]; 52 u_char ether_shost[ETHER_ADDR_LEN]; 53 u_short ether_type; 54 }; 55 56 /* 57 * Structure of a 48-bit Ethernet address. 58 */ 59 struct ether_addr { 60 u_char octet[ETHER_ADDR_LEN]; 61 }; 62 63 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */ 64 #define ETHERTYPE_IP 0x0800 /* IP protocol */ 65 #define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */ 66 #define ETHERTYPE_REVARP 0x8035 /* reverse Addr. resolution protocol */ 67 #define ETHERTYPE_VLAN 0x8100 /* IEEE 802.1Q VLAN tagging */ 68 #define ETHERTYPE_IPV6 0x86dd /* IPv6 */ 69 #define ETHERTYPE_LOOPBACK 0x9000 /* used to test interfaces */ 70 /* XXX - add more useful types here */ 71 72 /* 73 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have 74 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed 75 * by an ETHER type (as given above) and then the (variable-length) header. 76 */ 77 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */ 78 #define ETHERTYPE_NTRAILER 16 79 80 #define ETHERMTU (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN) 81 #define ETHERMIN (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN) 82 83 #ifdef _KERNEL 84 85 /* 86 * For device drivers to specify whether they support BPF or not 87 */ 88 #define ETHER_BPF_UNSUPPORTED 0 89 #define ETHER_BPF_SUPPORTED 1 90 91 struct ifnet; 92 struct mbuf; 93 94 extern void (*ng_ether_input_p)(struct ifnet *ifp, 95 struct mbuf **mp, struct ether_header *eh); 96 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, 97 struct mbuf *m, struct ether_header *eh); 98 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 99 extern void (*ng_ether_attach_p)(struct ifnet *ifp); 100 extern void (*ng_ether_detach_p)(struct ifnet *ifp); 101 102 #else /* _KERNEL */ 103 104 #include <sys/cdefs.h> 105 106 /* 107 * Ethernet address conversion/parsing routines. 108 */ 109 __BEGIN_DECLS 110 struct ether_addr *ether_aton __P((const char *)); 111 int ether_hostton __P((const char *, struct ether_addr *)); 112 int ether_line __P((const char *, struct ether_addr *, char *)); 113 char *ether_ntoa __P((const struct ether_addr *)); 114 int ether_ntohost __P((char *, const struct ether_addr *)); 115 __END_DECLS 116 117 #endif /* !_KERNEL */ 118 119 #endif /* !_NET_ETHERNET_H_ */ 120