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NetBSD/sys/net/if_ether.h

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/* $NetBSD: if_ether.h,v 1.89 2022/06/20 08:14:48 yamaguchi Exp $ */
/*
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)if_ether.h 8.1 (Berkeley) 6/10/93
*/
#ifndef _NET_IF_ETHER_H_
#define _NET_IF_ETHER_H_
#ifdef _KERNEL
#ifdef _KERNEL_OPT
#include "opt_mbuftrace.h"
#endif
#include <sys/mbuf.h>
#endif
#ifndef _STANDALONE
#include <net/if.h>
#endif
/*
* Some 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 length, including CRC */
#define ETHER_MAX_LEN 1518 /* maximum frame length, including CRC */
#define ETHER_MAX_LEN_JUMBO 9018 /* maximum jumbo frame len, including CRC */
/*
* Some Ethernet extensions.
*/
#define ETHER_VLAN_ENCAP_LEN 4 /* length of 802.1Q VLAN encapsulation */
#define EVL_VLANOFTAG(tag) ((tag) & 4095) /* VLAN ID */
#define EVL_PRIOFTAG(tag) (((tag) >> 13) & 7) /* Priority */
#define EVL_CFIOFTAG(tag) (((tag) >> 12) & 1) /* CFI */
#define ETHER_PPPOE_ENCAP_LEN 8 /* length of PPPoE 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 */
/*
* Ethernet address - 6 octets
* this is only used by the ethers(3) functions.
*/
struct ether_addr {
uint8_t ether_addr_octet[ETHER_ADDR_LEN];
};
/*
* Structure of a 10Mb/s Ethernet header.
*/
struct ether_header {
uint8_t ether_dhost[ETHER_ADDR_LEN];
uint8_t ether_shost[ETHER_ADDR_LEN];
uint16_t ether_type;
};
#include <net/ethertypes.h>
#define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */
#define ETHER_IS_LOCAL(addr) (*(addr) & 0x02) /* is address local? */
#define ETHERMTU_JUMBO (ETHER_MAX_LEN_JUMBO - ETHER_HDR_LEN - ETHER_CRC_LEN)
#define ETHERMTU (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
#define ETHERMIN (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
/*
* Compute the maximum frame size based on ethertype (i.e. possible
* encapsulation) and whether or not an FCS is present.
*/
#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) + \
(((etype) == ETHERTYPE_PPPOE) ? ETHER_PPPOE_ENCAP_LEN : 0))
/*
* Ethernet CRC32 polynomials (big- and little-endian verions).
*/
#define ETHER_CRC_POLY_LE 0xedb88320
#define ETHER_CRC_POLY_BE 0x04c11db6
#ifndef _STANDALONE
/*
* Ethernet-specific mbuf flags.
*/
#define M_HASFCS M_LINK0 /* FCS included at end of frame */
#define M_PROMISC M_LINK1 /* this packet is not for us */
#ifdef _KERNEL
/*
* Macro to map an IP multicast address to an Ethernet multicast address.
* The high-order 25 bits of the Ethernet address are statically assigned,
* and the low-order 23 bits are taken from the low end of the IP address.
*/
#define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
/* const struct in_addr *ipaddr; */ \
/* uint8_t enaddr[ETHER_ADDR_LEN]; */ \
do { \
(enaddr)[0] = 0x01; \
(enaddr)[1] = 0x00; \
(enaddr)[2] = 0x5e; \
(enaddr)[3] = ((const uint8_t *)ipaddr)[1] & 0x7f; \
(enaddr)[4] = ((const uint8_t *)ipaddr)[2]; \
(enaddr)[5] = ((const uint8_t *)ipaddr)[3]; \
} while (/*CONSTCOND*/0)
/*
* Macro to map an IP6 multicast address to an Ethernet multicast address.
* The high-order 16 bits of the Ethernet address are statically assigned,
* and the low-order 32 bits are taken from the low end of the IP6 address.
*/
#define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \
/* struct in6_addr *ip6addr; */ \
/* uint8_t enaddr[ETHER_ADDR_LEN]; */ \
{ \
(enaddr)[0] = 0x33; \
(enaddr)[1] = 0x33; \
(enaddr)[2] = ((const uint8_t *)ip6addr)[12]; \
(enaddr)[3] = ((const uint8_t *)ip6addr)[13]; \
(enaddr)[4] = ((const uint8_t *)ip6addr)[14]; \
(enaddr)[5] = ((const uint8_t *)ip6addr)[15]; \
}
#endif
struct mii_data;
struct ethercom;
typedef int (*ether_cb_t)(struct ethercom *);
typedef int (*ether_vlancb_t)(struct ethercom *, uint16_t, bool);
/*
* Structure shared between the ethernet driver modules and
* the multicast list code. For example, each ec_softc or il_softc
* begins with this structure.
*/
struct ethercom {
struct ifnet ec_if; /* network-visible interface */
LIST_HEAD(, ether_multi) ec_multiaddrs; /* list of ether multicast
addrs */
int ec_multicnt; /* length of ec_multiaddrs
list */
int ec_capabilities; /* capabilities, provided by
driver */
int ec_capenable; /* tells hardware which
capabilities to enable */
int ec_nvlans; /* # VLANs on this interface */
SIMPLEQ_HEAD(, vlanid_list) ec_vids; /* list of VLAN IDs */
/* The device handle for the MII bus child device. */
struct mii_data *ec_mii;
struct ifmedia *ec_ifmedia;
/*
* Called after a change to ec_if.if_flags. Returns
* ENETRESET if the device should be reinitialized with
* ec_if.if_init, 0 on success, not 0 on failure.
*/
ether_cb_t ec_ifflags_cb;
/*
* Called whenever a vlan interface is configured or unconfigured.
* Args include the vlan tag and a flag indicating whether the tag is
* being added or removed.
*/
ether_vlancb_t ec_vlan_cb;
/* Hooks called at the beginning of detach of this interface */
khook_list_t *ec_ifdetach_hooks;
kmutex_t *ec_lock;
/* Flags used only by the kernel */
int ec_flags;
#ifdef MBUFTRACE
struct mowner ec_rx_mowner; /* mbufs received */
struct mowner ec_tx_mowner; /* mbufs transmitted */
#endif
};
#define ETHERCAP_VLAN_MTU 0x00000001 /* VLAN-compatible MTU */
#define ETHERCAP_VLAN_HWTAGGING 0x00000002 /* hardware VLAN tag support */
#define ETHERCAP_JUMBO_MTU 0x00000004 /* 9000 byte MTU supported */
#define ETHERCAP_VLAN_HWFILTER 0x00000008 /* iface hw can filter vlan tag */
#define ETHERCAP_EEE 0x00000010 /* Energy Efficiency Ethernet */
#define ETHERCAP_MASK 0x0000001f
#define ECCAPBITS \
"\020" \
"\1VLAN_MTU" \
"\2VLAN_HWTAGGING" \
"\3JUMBO_MTU" \
"\4VLAN_HWFILTER" \
"\5EEE"
/* ioctl() for Ethernet capabilities */
struct eccapreq {
char eccr_name[IFNAMSIZ]; /* if name, e.g. "en0" */
int eccr_capabilities; /* supported capabiliites */
int eccr_capenable; /* capabilities enabled */
};
/* sysctl for Ethernet multicast addresses */
struct ether_multi_sysctl {
u_int enm_refcount;
uint8_t enm_addrlo[ETHER_ADDR_LEN];
uint8_t enm_addrhi[ETHER_ADDR_LEN];
};
#ifdef _KERNEL
/*
* Flags for ec_flags
*/
/* Store IFF_ALLMULTI in ec_flags instead of if_flags to avoid data races. */
#define ETHER_F_ALLMULTI __BIT(0)
extern const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN];
extern const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN];
extern const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN];
extern const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN];
void ether_set_ifflags_cb(struct ethercom *, ether_cb_t);
void ether_set_vlan_cb(struct ethercom *, ether_vlancb_t);
int ether_ioctl(struct ifnet *, u_long, void *);
int ether_addmulti(const struct sockaddr *, struct ethercom *);
int ether_delmulti(const struct sockaddr *, struct ethercom *);
int ether_multiaddr(const struct sockaddr *, uint8_t[], uint8_t[]);
void ether_input(struct ifnet *, struct mbuf *);
/*
* Ethernet multicast address structure. There is one of these for each
* multicast address or range of multicast addresses that we are supposed
* to listen to on a particular interface. They are kept in a linked list,
* rooted in the interface's ethercom structure.
*/
struct ether_multi {
uint8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */
uint8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */
u_int enm_refcount; /* no. claims to this addr/range */
LIST_ENTRY(ether_multi) enm_list;
};
/*
* Structure used by macros below to remember position when stepping through
* all of the ether_multi records.
*/
struct ether_multistep {
struct ether_multi *e_enm;
};
/*
* lookup the ether_multi record for a given range of Ethernet
* multicast addresses connected to a given ethercom structure.
* If no matching record is found, NULL is returned.
*/
static __inline struct ether_multi *
ether_lookup_multi(const uint8_t *addrlo, const uint8_t *addrhi,
const struct ethercom *ec)
{
struct ether_multi *enm;
LIST_FOREACH(enm, &ec->ec_multiaddrs, enm_list) {
if (memcmp(enm->enm_addrlo, addrlo, ETHER_ADDR_LEN) != 0)
continue;
if (memcmp(enm->enm_addrhi, addrhi, ETHER_ADDR_LEN) != 0)
continue;
break;
}
return enm;
}
/*
* step through all of the ether_multi records, one at a time.
* The current position is remembered in "step", which the caller must
* provide. ether_first_multi(), below, must be called to initialize "step"
* and get the first record. Both functions return a NULL when there
* are no remaining records.
*/
static __inline struct ether_multi *
ether_next_multi(struct ether_multistep *step)
{
struct ether_multi *enm;
enm = step->e_enm;
if (enm != NULL)
step->e_enm = LIST_NEXT(enm, enm_list);
return enm;
}
#define ETHER_NEXT_MULTI(step, enm) \
/* struct ether_multistep step; */ \
/* struct ether_multi *enm; */ \
(enm) = ether_next_multi(&(step))
static __inline struct ether_multi *
ether_first_multi(struct ether_multistep *step, const struct ethercom *ec)
{
step->e_enm = LIST_FIRST(&ec->ec_multiaddrs);
return ether_next_multi(step);
}
#define ETHER_FIRST_MULTI(step, ec, enm) \
/* struct ether_multistep step; */ \
/* struct ethercom *ec; */ \
/* struct ether_multi *enm; */ \
(enm) = ether_first_multi(&(step), (ec))
#define ETHER_LOCK(ec) mutex_enter((ec)->ec_lock)
#define ETHER_UNLOCK(ec) mutex_exit((ec)->ec_lock)
/*
* Ethernet 802.1Q VLAN structures.
*/
/* for ethercom */
struct vlanid_list {
uint16_t vid;
SIMPLEQ_ENTRY(vlanid_list) vid_list;
};
/* add VLAN tag to input/received packet */
static __inline void
vlan_set_tag(struct mbuf *m, uint16_t vlantag)
{
/* VLAN tag contains priority, CFI and VLAN ID */
KASSERT((m->m_flags & M_PKTHDR) != 0);
m->m_pkthdr.ether_vtag = vlantag;
m->m_flags |= M_VLANTAG;
return;
}
/* extract VLAN ID value from a VLAN tag */
static __inline uint16_t
vlan_get_tag(struct mbuf *m)
{
KASSERT((m->m_flags & M_PKTHDR) != 0);
KASSERT(m->m_flags & M_VLANTAG);
return m->m_pkthdr.ether_vtag;
}
static __inline bool
vlan_has_tag(struct mbuf *m)
{
return (m->m_flags & M_VLANTAG) != 0;
}
static __inline bool
vlan_is_hwtag_enabled(struct ifnet *_ifp)
{
struct ethercom *ec = (void *)_ifp;
if (ec->ec_capenable & ETHERCAP_VLAN_HWTAGGING)
return true;
return false;
}
/* test if any VLAN is configured for this interface */
#define VLAN_ATTACHED(ec) ((ec)->ec_nvlans > 0)
void etherinit(void);
void ether_ifattach(struct ifnet *, const uint8_t *);
void ether_ifdetach(struct ifnet *);
int ether_mediachange(struct ifnet *);
void ether_mediastatus(struct ifnet *, struct ifmediareq *);
void * ether_ifdetachhook_establish(struct ifnet *,
void (*)(void *), void *arg);
void ether_ifdetachhook_disestablish(struct ifnet *,
void *, kmutex_t *);
char *ether_sprintf(const uint8_t *);
char *ether_snprintf(char *, size_t, const uint8_t *);
uint32_t ether_crc32_le(const uint8_t *, size_t);
uint32_t ether_crc32_be(const uint8_t *, size_t);
int ether_aton_r(u_char *, size_t, const char *);
int ether_enable_vlan_mtu(struct ifnet *);
int ether_disable_vlan_mtu(struct ifnet *);
int ether_add_vlantag(struct ifnet *, uint16_t, bool *);
int ether_del_vlantag(struct ifnet *, uint16_t);
int ether_inject_vlantag(struct mbuf **, uint16_t, uint16_t);
struct mbuf *
ether_strip_vlantag(struct mbuf *);
#else
/*
* Prototype ethers(3) functions.
*/
#include <sys/cdefs.h>
__BEGIN_DECLS
char * ether_ntoa(const struct ether_addr *);
struct ether_addr *
ether_aton(const char *);
int ether_ntohost(char *, const struct ether_addr *);
int ether_hostton(const char *, struct ether_addr *);
int ether_line(const char *, struct ether_addr *, char *);
__END_DECLS
#endif
#endif /* _STANDALONE */
#endif /* !_NET_IF_ETHER_H_ */
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