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Annotation of XNU/bsd/netinet/in_hostcache.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * The contents of this file constitute Original Code as defined in and
                      7:  * are subject to the Apple Public Source License Version 1.1 (the
                      8:  * "License").  You may not use this file except in compliance with the
                      9:  * License.  Please obtain a copy of the License at
                     10:  * http://www.apple.com/publicsource and read it before using this file.
                     11:  * 
                     12:  * This Original Code and all software distributed under the License are
                     13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     17:  * License for the specific language governing rights and limitations
                     18:  * under the License.
                     19:  * 
                     20:  * @APPLE_LICENSE_HEADER_END@
                     21:  */
                     22: /*
                     23:  * Copyright 1997 Massachusetts Institute of Technology
                     24:  *
                     25:  * Permission to use, copy, modify, and distribute this software and
                     26:  * its documentation for any purpose and without fee is hereby
                     27:  * granted, provided that both the above copyright notice and this
                     28:  * permission notice appear in all copies, that both the above
                     29:  * copyright notice and this permission notice appear in all
                     30:  * supporting documentation, and that the name of M.I.T. not be used
                     31:  * in advertising or publicity pertaining to distribution of the
                     32:  * software without specific, written prior permission.  M.I.T. makes
                     33:  * no representations about the suitability of this software for any
                     34:  * purpose.  It is provided "as is" without express or implied
                     35:  * warranty.
                     36:  * 
                     37:  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
                     38:  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
                     39:  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
                     40:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
                     41:  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
                     42:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
                     43:  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
                     44:  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
                     45:  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
                     46:  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
                     47:  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     48:  * SUCH DAMAGE.
                     49:  *
                     50:  */
                     51: 
                     52: #ifndef _NETINET_IN_HOSTCACHE_H
                     53: #define        _NETINET_IN_HOSTCACHE_H 1
                     54: 
                     55: /*
                     56:  * This file defines the particular structures contained in the host cache
                     57:  * for the use of IP.
                     58:  */
                     59: 
                     60: /*
                     61:  * An IP host cache entry.  Note that we include the srtt/var here,
                     62:  * with the expectation that it might be used to keep a persistent,
                     63:  * cross-connection view of this statistic.
                     64:  */
                     65: struct in_hcentry {
                     66:        struct  hcentry inhc_hc;
                     67:        u_long  inhc_pmtu;
                     68:        u_long  inhc_recvpipe;
                     69:        u_long  inhc_sendpipe;
                     70:        u_long  inhc_pksent;
                     71:        u_long  inhc_flags;
                     72:        u_long  inhc_ssthresh;
                     73:        int     inhc_srtt;      /* VJ RTT estimator */
                     74:        int     inhc_srttvar;   /* VJ */
                     75:        u_int   inhc_rttmin;    /* VJ */
                     76:        int     inhc_rxt;       /* TCP retransmit timeout */
                     77:        u_long  inhc_cc;        /* deliberate type pun with tcp_cc */
                     78:        u_long  inhc_ccsent;    /* as above */
                     79:        u_short inhc_mssopt;
                     80: };
                     81: 
                     82: #define        inhc_addr(inhc) ((struct sockaddr_in *)(inhc)->inhc_hc.hc_host)
                     83: 
                     84: /* Flags for inhc_flags... */
                     85: #define        INHC_LOCAL      0x0001  /* this address is local */
                     86: #define        INHC_BROADCAST  0x0002  /* this address is broadcast */
                     87: #define        INHC_MULTICAST  0x0004  /* this address is multicast */
                     88: #define        INHC_REDUCEDMTU 0x0008  /* we reduced the mtu via PMTU discovery */
                     89: 
                     90: #ifdef KERNEL
                     91: /*
                     92:  * inhc_alloc can block while adding a new entry to the cache;
                     93:  * inhc_lookup will does not add new entries and so can be called
                     94:  * in non-process context.
                     95:  */
                     96: struct in_hcentry *inhc_alloc(struct sockaddr_in *sin);
                     97: int    inhc_init(void);
                     98: struct in_hcentry *inhc_lookup(struct sockaddr_in *sin);
                     99: #define        inhc_ref(inhc)  (hc_ref(&(inhc)->inhc_hc))
                    100: #define        inhc_rele(inhc) (hc_rele(&(inhc)->inhc_hc))
                    101: #endif /* KERNEL */
                    102: 
                    103: #endif /* _NETINET_IN_HOSTCACHE_H */

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