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of two compares against 0. The negative effect of cache flushing is probably more than the gain by not doing the two compares (the value is almost certainly in register or at worst, cache). Note that the uses of m_freem() are in error cases and m_freem() handles NULL anyhow. So fast-path really isn't changed much at all.
119 lines
4.3 KiB
C
119 lines
4.3 KiB
C
/*-
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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 8.3 (Berkeley) 5/2/95
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* $FreeBSD$
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*/
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#ifndef _NETINET_IF_ETHER_H_
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#define _NETINET_IF_ETHER_H_
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#include <net/ethernet.h>
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#include <net/if_arp.h>
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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_char 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_char *)ipaddr)[1] & 0x7f; \
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(enaddr)[4] = ((u_char *)ipaddr)[2]; \
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(enaddr)[5] = ((u_char *)ipaddr)[3]; \
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}
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/*
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* Macro to map an IP6 multicast address to an Ethernet multicast address.
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* The high-order 16 bits of the Ethernet address are statically assigned,
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* and the low-order 32 bits are taken from the low end of the IP6 address.
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*/
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#define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \
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/* struct in6_addr *ip6addr; */ \
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/* u_char enaddr[ETHER_ADDR_LEN]; */ \
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{ \
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(enaddr)[0] = 0x33; \
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(enaddr)[1] = 0x33; \
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(enaddr)[2] = ((u_char *)ip6addr)[12]; \
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(enaddr)[3] = ((u_char *)ip6addr)[13]; \
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(enaddr)[4] = ((u_char *)ip6addr)[14]; \
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(enaddr)[5] = ((u_char *)ip6addr)[15]; \
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}
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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_char arp_sha[ETHER_ADDR_LEN]; /* sender hardware address */
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u_char arp_spa[4]; /* sender protocol address */
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u_char arp_tha[ETHER_ADDR_LEN]; /* target hardware address */
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u_char 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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struct sockaddr_inarp {
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u_char sin_len;
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u_char sin_family;
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u_short 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_short sin_tos;
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u_short 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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extern u_char ether_ipmulticast_min[ETHER_ADDR_LEN];
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extern u_char ether_ipmulticast_max[ETHER_ADDR_LEN];
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int arpresolve(struct ifnet *ifp, struct rtentry *rt,
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struct mbuf *m, struct sockaddr *dst, u_char *desten);
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void arp_ifinit(struct ifnet *, struct ifaddr *);
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void arp_ifinit2(struct ifnet *, struct ifaddr *, u_char *);
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#endif
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#endif
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