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general cleanups mostly aimed at improving portability of drivers

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o ETHER_* (ETHER_ALIGN, ETHER_MAX_FRAME, ETHER_CRC_LEN, etc.)
o M_HASFCS for drivers to indicate packets include FCS
o remove global declarations for ng_ether* and vlan_* since these
  represent a private contract between the if_ethersubr.c code and
  certain parts of the system that should not normally be abused
o add ether_* declarations that were elsewhere
o remove ETHER_BPF_* since they are no longer used with the parameter
  no longer passed to ether_ifattach and ether_ifdetach

Reviewed by:	many
Approved by:	re
This commit is contained in:
Sam Leffler 2002-11-14 23:28:47 +00:00
parent 24a229f466
commit eef6f89728
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=106929
1 changed files with 43 additions and 48 deletions
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91
sys/net/ethernet.h
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@ -9,34 +9,44 @@
#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.
* Somce basic Ethernet constants.
*/
#define ETHER_ADDR_LEN 6 /* length of an Ethernet address */
#define ETHER_TYPE_LEN 2 /* length of the Ethernet type field */
#define ETHER_CRC_LEN 4 /* length of the Ethernet CRC */
#define ETHER_HDR_LEN (ETHER_ADDR_LEN*2+ETHER_TYPE_LEN)
#define ETHER_MIN_LEN 64 /* minimum frame len, including CRC */
#define ETHER_MAX_LEN 1518 /* maximum frame len, including CRC */
#define ETHER_MAX_LEN_JUMBO 9018 /* max jumbo frame len, including CRC */
#define ETHER_VLAN_ENCAP_LEN 4 /* len of 802.1Q VLAN encapsulation */
/*
* Mbuf adjust factor to force 32-bit alignment of IP header.
* Drivers should do m_adj(m, ETHER_ALIGN) when setting up a
* receive so the upper layers get the IP header properly aligned
* past the 14-byte Ethernet header.
*/
#define ETHER_ALIGN 2 /* driver adjust for IP hdr alignment */
/*
* The minimum packet length.
* Compute the maximum frame size based on ethertype (i.e. possible
* encapsulation) and whether or not an FCS is present.
*/
#define ETHER_MIN_LEN 64
#define ETHER_MAX_FRAME(ifp, etype, hasfcs) \
((ifp)->if_mtu + ETHER_HDR_LEN + \
((hasfcs) ? ETHER_CRC_LEN : 0) + \
(((etype) == ETHERTYPE_VLAN) ? ETHER_VLAN_ENCAP_LEN : 0))
/*
* The maximum packet length.
* Ethernet-specific mbuf flags.
*/
#define ETHER_MAX_LEN 1518
#define M_HASFCS M_PROTO5 /* FCS included at end of frame */
/*
* Ethernet CRC32 polynomials (big- and little-endian verions).
*/
#define ETHER_CRC_POLY_LE 0xedb88320
#define ETHER_CRC_POLY_BE 0x04c11db6
/*
* A macro to validate a length with
@ -60,6 +70,8 @@ struct ether_addr {
u_char octet[ETHER_ADDR_LEN];
};
#define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */
/*
* NOTE: 0x0000-0x05DC (0..1500) are generally IEEE 802.3 length fields.
* However, there are some conflicts.
@ -329,40 +341,23 @@ struct ether_addr {
#define ETHERMTU (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
#define ETHERMIN (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
#define ETHERMTU_JUMBO (ETHER_MAX_LEN_JUMBO - 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;
struct rtentry;
struct sockaddr;
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)
extern void ether_demux(struct ifnet *, struct mbuf *);
extern void ether_ifattach(struct ifnet *, const u_int8_t *);
extern void ether_ifdetach(struct ifnet *);
extern int ether_ioctl(struct ifnet *, int, caddr_t);
extern int ether_output(struct ifnet *,
struct mbuf *, struct sockaddr *, struct rtentry *);
extern int ether_output_frame(struct ifnet *, struct mbuf *);
extern char *ether_sprintf(const u_int8_t *);
#else /* _KERNEL */