135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
/*
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* Fundamental constants relating to ethernet.
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*
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* $FreeBSD$
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*
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*/
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#ifndef _NET_ETHERNET_H_
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#define _NET_ETHERNET_H_
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/*
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* The number of bytes in an ethernet (MAC) address.
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*/
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#define ETHER_ADDR_LEN 6
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/*
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* The number of bytes in the type field.
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*/
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#define ETHER_TYPE_LEN 2
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/*
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* The number of bytes in the trailing CRC field.
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*/
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#define ETHER_CRC_LEN 4
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/*
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* The length of the combined header.
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*/
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#define ETHER_HDR_LEN (ETHER_ADDR_LEN*2+ETHER_TYPE_LEN)
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/*
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* The minimum packet length.
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*/
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#define ETHER_MIN_LEN 64
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/*
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* The maximum packet length.
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*/
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#define ETHER_MAX_LEN 1518
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/*
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* A macro to validate a length with
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*/
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#define ETHER_IS_VALID_LEN(foo) \
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((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
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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_char ether_dhost[ETHER_ADDR_LEN];
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u_char ether_shost[ETHER_ADDR_LEN];
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u_short ether_type;
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};
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/*
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* Structure of a 48-bit Ethernet address.
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*/
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struct ether_addr {
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u_char octet[ETHER_ADDR_LEN];
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};
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#define ETHERTYPE_PUP 0x0200 /* PUP protocol */
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#define ETHERTYPE_IP 0x0800 /* IP protocol */
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#define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */
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#define ETHERTYPE_REVARP 0x8035 /* reverse Addr. resolution protocol */
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#define ETHERTYPE_VLAN 0x8100 /* IEEE 802.1Q VLAN tagging */
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#define ETHERTYPE_IPV6 0x86dd /* IPv6 */
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#define ETHERTYPE_LOOPBACK 0x9000 /* used to test interfaces */
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/* XXX - add more useful types here */
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/*
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* The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
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* (type-ETHERTYPE_TRAIL)*512 bytes of data followed
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* by an ETHER type (as given above) and then the (variable-length) header.
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*/
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#define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */
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#define ETHERTYPE_NTRAILER 16
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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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#ifdef _KERNEL
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/*
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* For device drivers to specify whether they support BPF or not
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*/
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#define ETHER_BPF_UNSUPPORTED 0
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#define ETHER_BPF_SUPPORTED 1
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struct ifnet;
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struct mbuf;
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extern void (*ng_ether_input_p)(struct ifnet *ifp,
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struct mbuf **mp, struct ether_header *eh);
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extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp,
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struct mbuf *m, struct ether_header *eh);
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extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
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extern void (*ng_ether_attach_p)(struct ifnet *ifp);
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extern void (*ng_ether_detach_p)(struct ifnet *ifp);
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extern int (*vlan_input_p)(struct ether_header *eh, struct mbuf *m);
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extern int (*vlan_input_tag_p)(struct ether_header *eh, struct mbuf *m,
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u_int16_t t);
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#define VLAN_INPUT_TAG(eh, m, t) do { \
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/* XXX: lock */ \
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if (vlan_input_tag_p != NULL) \
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(*vlan_input_tag_p)(eh, m, t); \
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else { \
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(m)->m_pkthdr.rcvif->if_noproto++; \
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m_freem(m); \
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} \
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/* XXX: unlock */ \
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} while (0)
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#else /* _KERNEL */
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#include <sys/cdefs.h>
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/*
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* Ethernet address conversion/parsing routines.
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*/
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__BEGIN_DECLS
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struct ether_addr *ether_aton(const char *);
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int ether_hostton(const char *, struct ether_addr *);
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int ether_line(const char *, struct ether_addr *, char *);
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char *ether_ntoa(const struct ether_addr *);
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int ether_ntohost(char *, const struct ether_addr *);
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__END_DECLS
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#endif /* !_KERNEL */
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#endif /* !_NET_ETHERNET_H_ */
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