Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_syncache.h
Version:
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1993, 1994, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 32 * $FreeBSD: releng/12.0/sys/netinet/tcp_syncache.h 339430 2018-10-18 19:21:18Z tuexen $ 33 */ 34 35 #ifndef _NETINET_TCP_SYNCACHE_H_ 36 #define _NETINET_TCP_SYNCACHE_H_ 37 #ifdef _KERNEL 38 39 void syncache_init(void); 40 #ifdef VIMAGE 41 void syncache_destroy(void); 42 #endif 43 void syncache_unreach(struct in_conninfo *, tcp_seq); 44 int syncache_expand(struct in_conninfo *, struct tcpopt *, 45 struct tcphdr *, struct socket **, struct mbuf *); 46 int syncache_add(struct in_conninfo *, struct tcpopt *, 47 struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *, 48 void *, void *); 49 void syncache_chkrst(struct in_conninfo *, struct tcphdr *, struct mbuf *); 50 void syncache_badack(struct in_conninfo *); 51 int syncache_pcblist(struct sysctl_req *req, int max_pcbs, int *pcbs_exported); 52 53 struct syncache { 54 TAILQ_ENTRY(syncache) sc_hash; 55 struct in_conninfo sc_inc; /* addresses */ 56 int sc_rxttime; /* retransmit time */ 57 u_int16_t sc_rxmits; /* retransmit counter */ 58 u_int32_t sc_tsreflect; /* timestamp to reflect */ 59 u_int32_t sc_tsoff; /* ts offset w/ syncookies */ 60 u_int32_t sc_flowlabel; /* IPv6 flowlabel */ 61 tcp_seq sc_irs; /* seq from peer */ 62 tcp_seq sc_iss; /* our ISS */ 63 struct mbuf *sc_ipopts; /* source route */ 64 u_int16_t sc_peer_mss; /* peer's MSS */ 65 u_int16_t sc_wnd; /* advertised window */ 66 u_int8_t sc_ip_ttl; /* IPv4 TTL */ 67 u_int8_t sc_ip_tos; /* IPv4 TOS */ 68 u_int8_t sc_requested_s_scale:4, 69 sc_requested_r_scale:4; 70 u_int16_t sc_flags; 71 #if defined(TCP_OFFLOAD) || !defined(TCP_OFFLOAD_DISABLE) 72 struct toedev *sc_tod; /* entry added by this TOE */ 73 void *sc_todctx; /* TOE driver context */ 74 #endif 75 struct label *sc_label; /* MAC label reference */ 76 struct ucred *sc_cred; /* cred cache for jail checks */ 77 void *sc_tfo_cookie; /* for TCP Fast Open response */ 78 void *sc_pspare; /* TCP_SIGNATURE */ 79 u_int32_t sc_spare[2]; /* UTO */ 80 }; 81 82 /* 83 * Flags for the sc_flags field. 84 */ 85 #define SCF_NOOPT 0x01 /* no TCP options */ 86 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 87 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 88 /* MSS is implicit */ 89 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 90 #define SCF_SIGNATURE 0x20 /* send MD5 digests */ 91 #define SCF_SACK 0x80 /* send SACK option */ 92 #define SCF_ECN 0x100 /* send ECN setup packet */ 93 94 struct syncache_head { 95 struct mtx sch_mtx; 96 TAILQ_HEAD(sch_head, syncache) sch_bucket; 97 struct callout sch_timer; 98 int sch_nextc; 99 u_int sch_length; 100 struct tcp_syncache *sch_sc; 101 time_t sch_last_overflow; 102 }; 103 104 #define SYNCOOKIE_SECRET_SIZE 16 105 #define SYNCOOKIE_LIFETIME 15 /* seconds */ 106 107 struct syncookie_secret { 108 volatile u_int oddeven; 109 uint8_t key[2][SYNCOOKIE_SECRET_SIZE]; 110 struct callout reseed; 111 u_int lifetime; 112 }; 113 114 struct tcp_syncache { 115 struct syncache_head *hashbase; 116 uma_zone_t zone; 117 u_int hashsize; 118 u_int hashmask; 119 u_int bucket_limit; 120 u_int cache_limit; 121 u_int rexmt_limit; 122 uint32_t hash_secret; 123 struct vnet *vnet; 124 struct syncookie_secret secret; 125 }; 126 127 /* Internal use for the syncookie functions. */ 128 union syncookie { 129 uint8_t cookie; 130 struct { 131 uint8_t odd_even:1, 132 sack_ok:1, 133 wscale_idx:3, 134 mss_idx:3; 135 } flags; 136 }; 137 138 #endif /* _KERNEL */ 139 #endif /* !_NETINET_TCP_SYNCACHE_H_ */
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