1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Rick Macklem at The University of Guelph.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $FreeBSD$
35 */
36
37 #ifndef _NFS_NFSRVCACHE_H_
38 #define _NFS_NFSRVCACHE_H_
39
40 /*
41 * Definitions for the server recent request cache
42 */
43 #define NFSRVCACHE_MAX_SIZE 2048
44 #define NFSRVCACHE_MIN_SIZE 64
45
46 #define NFSRVCACHE_HASHSIZE 500
47
48 /* Cache table entry. */
49 struct nfsrvcache {
50 LIST_ENTRY(nfsrvcache) rc_hash; /* Hash chain */
51 LIST_ENTRY(nfsrvcache) rc_ahash; /* ACK hash chain */
52 TAILQ_ENTRY(nfsrvcache) rc_lru; /* UDP lru chain */
53 u_int32_t rc_xid; /* rpc id number */
54 time_t rc_timestamp; /* Time done */
55 union {
56 struct mbuf *repmb; /* Reply mbuf list OR */
57 int repstat; /* Reply status */
58 } rc_un;
59 union {
60 struct {
61 union nethostaddr haddr; /* Host address */
62 } udp;
63 struct {
64 u_int64_t sockref;
65 u_int32_t len;
66 u_int32_t tcpseq;
67 int16_t refcnt;
68 u_int16_t cksum;
69 time_t cachetime;
70 int acked;
71 } ot;
72 } rc_un2;
73 u_int16_t rc_proc; /* rpc proc number */
74 u_int16_t rc_flag; /* Flag bits */
75 };
76
77 #define rc_reply rc_un.repmb
78 #define rc_status rc_un.repstat
79 #define rc_inet rc_un2.udp.haddr.had_inet.s_addr
80 #define rc_inet6 rc_un2.udp.haddr.had_inet6
81 #define rc_haddr rc_un2.udp.haddr
82 #define rc_sockref rc_un2.ot.sockref
83 #define rc_tcpseq rc_un2.ot.tcpseq
84 #define rc_refcnt rc_un2.ot.refcnt
85 #define rc_reqlen rc_un2.ot.len
86 #define rc_cksum rc_un2.ot.cksum
87 #define rc_cachetime rc_un2.ot.cachetime
88 #define rc_acked rc_un2.ot.acked
89
90 /* TCP ACK values */
91 #define RC_NO_SEQ 0
92 #define RC_NO_ACK 1
93 #define RC_ACK 2
94 #define RC_NACK 3
95
96 /* Return values */
97 #define RC_DROPIT 0
98 #define RC_REPLY 1
99 #define RC_DOIT 2
100
101 /* Flag bits */
102 #define RC_LOCKED 0x0001
103 #define RC_WANTED 0x0002
104 #define RC_REPSTATUS 0x0004
105 #define RC_REPMBUF 0x0008
106 #define RC_UDP 0x0010
107 #define RC_INETIPV6 0x0020
108 #define RC_INPROG 0x0040
109 #define RC_NFSV2 0x0100
110 #define RC_NFSV3 0x0200
111 #define RC_NFSV4 0x0400
112 #define RC_NFSVERS (RC_NFSV2 | RC_NFSV3 | RC_NFSV4)
113 #define RC_REFCNT 0x0800
114 #define RC_SAMETCPCONN 0x1000
115
116 LIST_HEAD(nfsrvhashhead, nfsrvcache);
117
118 /* The fine-grained locked cache hash table for TCP. */
119 struct nfsrchash_bucket {
120 struct mtx mtx;
121 struct nfsrvhashhead tbl;
122 };
123
124 #endif /* _NFS_NFSRVCACHE_H_ */
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