ethernet.h

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    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_LOOPBACK      0x9000  /* used to test interfaces */
   69 /* XXX - add more useful types here */
   70 
   71 /*
   72  * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
   73  * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
   74  * by an ETHER type (as given above) and then the (variable-length) header.
   75  */
   76 #define ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
   77 #define ETHERTYPE_NTRAILER      16
   78 
   79 #define ETHERMTU        (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
   80 #define ETHERMIN        (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
   81 
   82 #ifndef KERNEL
   83 #include <sys/cdefs.h>
   84 
   85 /*
   86  * Ethernet address conversion/parsing routines.
   87  */
   88 __BEGIN_DECLS
   89 struct  ether_addr *ether_aton __P((char *));
   90 int     ether_hostton __P((char *, struct ether_addr *));
   91 int     ether_line __P((char *, struct ether_addr *, char *));
   92 char    *ether_ntoa __P((struct ether_addr *));
   93 int     ether_ntohost __P((char *, struct ether_addr *));
   94 __END_DECLS
   95 #endif /* !KERNEL */
   96 
   97 #endif /* !_NET_ETHERNET_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/net/ethernet.h

FreeBSD/Linux Kernel Cross Reference
sys/net/ethernet.h