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6e6b3f7cbc
1. separating L2 tables (ARP, NDP) from the L3 routing tables
2. removing as much locking dependencies among these layers as
possible to allow for some parallelism in the search operations
3. simplify the logic in the routing code,
The most notable end result is the obsolescent of the route
cloning (RTF_CLONING) concept, which translated into code reduction
in both IPv4 ARP and IPv6 NDP related modules, and size reduction in
struct rtentry{}. The change in design obsoletes the semantics of
RTF_CLONING, RTF_WASCLONE and RTF_LLINFO routing flags. The userland
applications such as "arp" and "ndp" have been modified to reflect
those changes. The output from "netstat -r" shows only the routing
entries.
Quite a few developers have contributed to this project in the
past: Glebius Smirnoff, Luigi Rizzo, Alessandro Cerri, and
Andre Oppermann. And most recently:
- Kip Macy revised the locking code completely, thus completing
the last piece of the puzzle, Kip has also been conducting
active functional testing
- Sam Leffler has helped me improving/refactoring the code, and
provided valuable reviews
- Julian Elischer setup the perforce tree for me and has helped
me maintaining that branch before the svn conversion
262 lines
8.8 KiB
C
262 lines
8.8 KiB
C
/* $NetBSD: if_ether.h,v 1.25 1997/01/17 17:06:06 mikel Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)if_ether.h 8.1 (Berkeley) 6/10/93
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*
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* $FreeBSD$
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*/
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/*
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* Ethernet address - 6 octets
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* this is only used by the ethers(3) functions.
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*/
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struct ether_addr {
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u_int8_t ether_addr_octet[6];
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};
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/*
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* Structure of a 10Mb/s Ethernet header.
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*/
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#define ETHER_ADDR_LEN 6
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struct ether_header {
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u_int8_t ether_dhost[ETHER_ADDR_LEN];
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u_int8_t ether_shost[ETHER_ADDR_LEN];
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u_int16_t ether_type;
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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 /* address resolution protocol */
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#define ETHERTYPE_REVARP 0x8035 /* reverse addr resolution protocol */
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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 ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */
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#define ETHERMTU 1500
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#define ETHERMIN (60-14)
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#ifdef _KERNEL
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/*
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* Macro to map an IP multicast address to an Ethernet multicast address.
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* The high-order 25 bits of the Ethernet address are statically assigned,
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* and the low-order 23 bits are taken from the low end of the IP address.
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*/
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#define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
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/* struct in_addr *ipaddr; */ \
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/* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \
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{ \
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(enaddr)[0] = 0x01; \
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(enaddr)[1] = 0x00; \
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(enaddr)[2] = 0x5e; \
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(enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \
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(enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \
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(enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \
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}
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#endif
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/*
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* Ethernet Address Resolution Protocol.
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*
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* See RFC 826 for protocol description. Structure below is adapted
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* to resolving internet addresses. Field names used correspond to
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* RFC 826.
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*/
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struct ether_arp {
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struct arphdr ea_hdr; /* fixed-size header */
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u_int8_t arp_sha[ETHER_ADDR_LEN]; /* sender hardware address */
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u_int8_t arp_spa[4]; /* sender protocol address */
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u_int8_t arp_tha[ETHER_ADDR_LEN]; /* target hardware address */
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u_int8_t arp_tpa[4]; /* target protocol address */
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};
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#define arp_hrd ea_hdr.ar_hrd
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#define arp_pro ea_hdr.ar_pro
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#define arp_hln ea_hdr.ar_hln
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#define arp_pln ea_hdr.ar_pln
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#define arp_op ea_hdr.ar_op
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/*
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* Structure shared between the ethernet driver modules and
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* the address resolution code. For example, each ec_softc or il_softc
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* begins with this structure.
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*/
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struct arpcom {
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struct ifnet ac_if; /* network-visible interface */
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u_int8_t ac_enaddr[ETHER_ADDR_LEN]; /* ethernet hardware address */
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char ac__pad[2]; /* be nice to m68k ports */
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LIST_HEAD(, ether_multi) ac_multiaddrs; /* list of ether multicast addrs */
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int ac_multicnt; /* length of ac_multiaddrs list */
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};
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struct llinfo_arp {
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LIST_ENTRY(llinfo_arp) la_list;
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struct rtentry *la_rt;
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struct mbuf *la_hold; /* last packet until resolved/timeout */
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long la_asked; /* last time we QUERIED for this addr */
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#define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */
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};
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struct sockaddr_inarp {
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u_int8_t sin_len;
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u_int8_t sin_family;
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u_int16_t sin_port;
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struct in_addr sin_addr;
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struct in_addr sin_srcaddr;
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u_int16_t sin_tos;
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u_int16_t sin_other;
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#define SIN_PROXY 1
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};
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/*
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* IP and ethernet specific routing flags
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*/
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#define RTF_USETRAILERS RTF_PROTO1 /* use trailers */
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#define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */
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#ifdef _KERNEL
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u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN];
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u_int8_t ether_ipmulticast_min[ETHER_ADDR_LEN];
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u_int8_t ether_ipmulticast_max[ETHER_ADDR_LEN];
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struct ifqueue arpintrq;
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void arpwhohas(struct arpcom *, struct in_addr *);
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void arpintr(void);
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int arpresolve(struct arpcom *,
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struct rtentry *, struct mbuf *, struct sockaddr *, u_char *, struct llentry **);
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void arp_ifinit(struct arpcom *, struct ifaddr *);
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void arp_rtrequest(int, struct rtentry *, struct sockaddr *);
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int ether_addmulti(struct ifreq *, struct arpcom *);
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int ether_delmulti(struct ifreq *, struct arpcom *);
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#endif /* _KERNEL */
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/*
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* Ethernet multicast address structure. There is one of these for each
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* multicast address or range of multicast addresses that we are supposed
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* to listen to on a particular interface. They are kept in a linked list,
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* rooted in the interface's arpcom structure. (This really has nothing to
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* do with ARP, or with the Internet address family, but this appears to be
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* the minimally-disrupting place to put it.)
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*/
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struct ether_multi {
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u_int8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */
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u_int8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */
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struct arpcom *enm_ac; /* back pointer to arpcom */
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u_int enm_refcount; /* no. claims to this addr/range */
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LIST_ENTRY(ether_multi) enm_list;
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};
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/*
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* Structure used by macros below to remember position when stepping through
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* all of the ether_multi records.
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*/
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struct ether_multistep {
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struct ether_multi *e_enm;
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};
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/*
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* Macro for looking up the ether_multi record for a given range of Ethernet
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* multicast addresses connected to a given arpcom structure. If no matching
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* record is found, "enm" returns NULL.
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*/
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#define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \
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/* u_int8_t addrlo[ETHER_ADDR_LEN]; */ \
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/* u_int8_t addrhi[ETHER_ADDR_LEN]; */ \
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/* struct arpcom *ac; */ \
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/* struct ether_multi *enm; */ \
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{ \
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for ((enm) = (ac)->ac_multiaddrs.lh_first; \
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(enm) != NULL && \
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(bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \
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bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \
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(enm) = (enm)->enm_list.le_next); \
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}
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/*
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* Macro to step through all of the ether_multi records, one at a time.
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* The current position is remembered in "step", which the caller must
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* provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step"
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* and get the first record. Both macros return a NULL "enm" when there
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* are no remaining records.
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*/
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#define ETHER_NEXT_MULTI(step, enm) \
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/* struct ether_multistep step; */ \
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/* struct ether_multi *enm; */ \
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{ \
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if (((enm) = (step).e_enm) != NULL) \
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(step).e_enm = (enm)->enm_list.le_next; \
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}
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#define ETHER_FIRST_MULTI(step, ac, enm) \
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/* struct ether_multistep step; */ \
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/* struct arpcom *ac; */ \
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/* struct ether_multi *enm; */ \
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{ \
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(step).e_enm = (ac)->ac_multiaddrs.lh_first; \
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ETHER_NEXT_MULTI((step), (enm)); \
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}
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#ifdef _KERNEL
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void arp_rtrequest(int, struct rtentry *, struct sockaddr *);
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int arpresolve(struct arpcom *, struct rtentry *, struct mbuf *,
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struct sockaddr *, u_char *, struct llentry **);
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void arpintr(void);
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int arpioctl(u_long, caddr_t);
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void arp_ifinit(struct arpcom *, struct ifaddr *);
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void revarpinput(struct mbuf *);
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void in_revarpinput(struct mbuf *);
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void revarprequest(struct ifnet *);
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int revarpwhoarewe(struct ifnet *, struct in_addr *, struct in_addr *);
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int revarpwhoami(struct in_addr *, struct ifnet *);
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int db_show_arptab(void);
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#endif
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/*
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* Prototype ethers(3) functions.
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*/
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#ifndef _KERNEL
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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char * ether_ntoa(struct ether_addr *);
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struct ether_addr *
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ether_aton(char *);
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int ether_ntohost(char *, struct ether_addr *);
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int ether_hostton(char *, struct ether_addr *);
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int ether_line(char *, struct ether_addr *, char *);
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__END_DECLS
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#endif
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