+++ /dev/null
-/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-/*
- * Copyright 1997 Massachusetts Institute of Technology
- *
- * Permission to use, copy, modify, and distribute this software and
- * its documentation for any purpose and without fee is hereby
- * granted, provided that both the above copyright notice and this
- * permission notice appear in all copies, that both the above
- * copyright notice and this permission notice appear in all
- * supporting documentation, and that the name of M.I.T. not be used
- * in advertising or publicity pertaining to distribution of the
- * software without specific, written prior permission. M.I.T. makes
- * no representations about the suitability of this software for any
- * purpose. It is provided "as is" without express or implied
- * warranty.
- *
- * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
- * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
- * SHALL M.I.T. 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.
- *
- */
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/malloc.h>
-#include <sys/socket.h>
-#include <sys/socketvar.h>
-
-#include <net/hostcache.h>
-#include <net/if.h>
-#include <net/if_var.h>
-#include <net/route.h>
-
-#include <netinet/in.h>
-#include <netinet/in_hostcache.h>
-#include <netinet/tcp.h>
-#include <netinet/tcp_timer.h>
-#include <netinet/tcp_var.h>
-
-/*
- * Manage the IP per-host cache (really a thin veneer over the generic
- * per-host cache code).
- */
-
-/* Look up an entry -- can be called from interrupt context. */
-struct in_hcentry *
-inhc_lookup(struct sockaddr_in *sin)
-{
- struct hcentry *hc;
-
- hc = hc_get((struct sockaddr *)sin);
- return ((struct in_hcentry *)hc);
-}
-
-/* Look up and possibly create an entry -- must be called from user mode. */
-struct in_hcentry *
-inhc_alloc(struct sockaddr_in *sin)
-{
- struct in_hcentry *inhc;
- struct rtentry *rt;
- int error;
- /* xxx mutual exclusion for smp */
-
- inhc = inhc_lookup(sin);
- if (inhc != 0)
- return inhc;
-
- rt = rtalloc1(inhc->inhc_hc.hc_host, 1, 0);
- if (rt == 0)
- return 0;
-
- MALLOC(inhc, struct in_hcentry *, sizeof *inhc, M_HOSTCACHE, M_WAITOK);
- if (inhc == NULL)
- retturn (ENOMEM);
- bzero(inhc, sizeof *inhc);
- inhc->inhc_hc.hc_host = dup_sockaddr((struct sockaddr *)sin, 1);
- if (in_broadcast(sin->sin_addr, rt->rt_ifp))
- inhc->inhc_flags |= INHC_BROADCAST;
- else if (((struct sockaddr_in *)rt->rt_ifa->ifa_addr)->sin_addr.s_addr
- == sin->sin_addr.s_addr)
- inhc->inhc_flags |= INHC_LOCAL;
- else if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
- inhc->inhc_flags |= INHC_MULTICAST;
- inhc->inhc_pmtu = rt->rt_rmx.rmx_mtu;
- inhc->inhc_recvpipe = rt->rt_rmx.rmx_recvpipe;
- inhc->inhc_sendpipe = rt->rt_rmx.rmx_sendpipe;
- inhc->inhc_ssthresh = rt->rt_rmx.rmx_ssthresh;
- if (rt->rt_rmx.rmx_locks & RTV_RTT)
- inhc->inhc_rttmin = rt->rt_rmx.rmx_rtt
- / (RTM_RTTUNIT / TCP_RTT_SCALE);
- inhc->inhc_hc.hc_rt = rt;
- error = hc_insert(&inhc->inhc_hc);
- if (error != 0) {
- RTFREE(rt);
- FREE(inhc, M_HOSTCACHE);
- return 0;
- }
- /*
- * We don't return the structure directly because hc_get() needs
- * to be allowed to do its own processing.
- */
- return (inhc_lookup(sin));
-}
-
-/*
- * This is Van Jacobson's hash function for IPv4 addresses.
- * It is designed to work with a power-of-two-sized hash table.
- */
-static u_long
-inhc_hash(struct sockaddr *sa, u_long nbuckets)
-{
- u_long ip;
-
- ip = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
- return ((ip ^ (ip >> 23) ^ (ip >> 17)) & ~(nbuckets - 1));
-}
-
-/*
- * We don't need to do any special work... if there are no references,
- * as the caller has already ensured, then it's OK to kill.
- */
-static int
-inhc_delete(struct hcentry *hc)
-{
- return 0;
-}
-
-/*
- * Return the next increment for the number of buckets in the hash table.
- * Zero means ``do not bump''.
- */
-static u_long
-inhc_bump(u_long oldsize)
-{
- if (oldsize < 512)
- return (oldsize << 1);
- return 0;
-}
-
-static struct hccallback inhc_cb = {
- inhc_hash, inhc_delete, inhc_bump
-};
-
-int
-inhc_init(void)
-{
-
- return (hc_init(AF_INET, &inhc_cb, 128, 0));
-}
-
projects / apple / xnu.git / blobdiff