1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*
* Fundamental constants relating to ethernet.
*
* $FreeBSD: src/sys/net/ethernet.h,v 1.20 2002/04/04 05:42:09 luigi Exp $
*
*/
#ifndef _NET_ETHERNET_H_
#define _NET_ETHERNET_H_
/*
* The number of bytes in an ethernet (MAC) address.
*/
#define ETHER_ADDR_LEN 6
/*
* The number of bytes in the type field.
*/
#define ETHER_TYPE_LEN 2
/*
* The number of bytes in the trailing CRC field.
*/
#define ETHER_CRC_LEN 4
/*
* The length of the combined header.
*/
#define ETHER_HDR_LEN (ETHER_ADDR_LEN*2+ETHER_TYPE_LEN)
/*
* The minimum packet length.
*/
#define ETHER_MIN_LEN 64
/*
* The maximum packet length.
*/
#define ETHER_MAX_LEN 1518
/*
* A macro to validate a length with
*/
#define ETHER_IS_VALID_LEN(foo) \
((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
/*
* Structure of a 10Mb/s Ethernet header.
*/
struct ether_header {
u_char ether_dhost[ETHER_ADDR_LEN];
u_char ether_shost[ETHER_ADDR_LEN];
u_short ether_type;
};
/*
* Structure of a 48-bit Ethernet address.
*/
struct ether_addr {
u_char octet[ETHER_ADDR_LEN];
};
#define ETHERTYPE_PUP 0x0200 /* PUP protocol */
#define ETHERTYPE_IP 0x0800 /* IP protocol */
#define ETHERTYPE_ARP 0x0806 /* Addr. resolution protocol */
#define ETHERTYPE_REVARP 0x8035 /* reverse Addr. resolution protocol */
#define ETHERTYPE_VLAN 0x8100 /* IEEE 802.1Q VLAN tagging */
#define ETHERTYPE_IPV6 0x86dd /* IPv6 */
#define ETHERTYPE_LOOPBACK 0x9000 /* used to test interfaces */
/* XXX - add more useful types here */
/*
* The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
* (type-ETHERTYPE_TRAIL)*512 bytes of data followed
* by an ETHER type (as given above) and then the (variable-length) header.
*/
#define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */
#define ETHERTYPE_NTRAILER 16
#define ETHERMTU (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
#define ETHERMIN (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
#ifdef _KERNEL
/*
* For device drivers to specify whether they support BPF or not
*/
#define ETHER_BPF_UNSUPPORTED 0
#define ETHER_BPF_SUPPORTED 1
struct ifnet;
struct mbuf;
extern void (*ng_ether_input_p)(struct ifnet *ifp,
struct mbuf **mp, struct ether_header *eh);
extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp,
struct mbuf *m, struct ether_header *eh);
extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
extern void (*ng_ether_attach_p)(struct ifnet *ifp);
extern void (*ng_ether_detach_p)(struct ifnet *ifp);
extern int (*vlan_input_p)(struct ether_header *eh, struct mbuf *m);
extern int (*vlan_input_tag_p)(struct ether_header *eh, struct mbuf *m,
u_int16_t t);
#define VLAN_INPUT_TAG(eh, m, t) do { \
/* XXX: lock */ \
if (vlan_input_tag_p != NULL) \
(*vlan_input_tag_p)(eh, m, t); \
else { \
(m)->m_pkthdr.rcvif->if_noproto++; \
m_freem(m); \
} \
/* XXX: unlock */ \
} while (0)
#else /* _KERNEL */
#include <sys/cdefs.h>
/*
* Ethernet address conversion/parsing routines.
*/
__BEGIN_DECLS
struct ether_addr *ether_aton(const char *);
int ether_hostton(const char *, struct ether_addr *);
int ether_line(const char *, struct ether_addr *, char *);
char *ether_ntoa(const struct ether_addr *);
int ether_ntohost(char *, const struct ether_addr *);
__END_DECLS
#endif /* !_KERNEL */
#endif /* !_NET_ETHERNET_H_ */
|
