1 /*- 2 * Copyright (c) 1982, 1986, 1993, 1994, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 30 * $FreeBSD$ 31 */ 32 33 #ifndef _NETINET_TCP_SYNCACHE_H_ 34 #define _NETINET_TCP_SYNCACHE_H_ 35 #ifdef _KERNEL 36 37 void syncache_init(void); 38 void syncache_unreach(struct in_conninfo *, struct tcphdr *); 39 int syncache_expand(struct in_conninfo *, struct tcpopt *, 40 struct tcphdr *, struct socket **, struct mbuf *); 41 int tcp_offload_syncache_expand(struct in_conninfo *inc, struct tcpopt *to, 42 struct tcphdr *th, struct socket **lsop, struct mbuf *m); 43 void syncache_add(struct in_conninfo *, struct tcpopt *, 44 struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *); 45 void tcp_offload_syncache_add(struct in_conninfo *, struct tcpopt *, 46 struct tcphdr *, struct inpcb *, struct socket **, 47 struct toe_usrreqs *tu, void *toepcb); 48 49 void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 50 void syncache_badack(struct in_conninfo *); 51 int syncache_pcbcount(void); 52 int syncache_pcblist(struct sysctl_req *req, int max_pcbs, int *pcbs_exported); 53 54 struct syncache { 55 TAILQ_ENTRY(syncache) sc_hash; 56 struct in_conninfo sc_inc; /* addresses */ 57 int sc_rxttime; /* retransmit time */ 58 u_int16_t sc_rxmits; /* retransmit counter */ 59 u_int32_t sc_tsreflect; /* timestamp to reflect */ 60 u_int32_t sc_ts; /* our timestamp to send */ 61 u_int32_t sc_tsoff; /* ts offset w/ syncookies */ 62 u_int32_t sc_flowlabel; /* IPv6 flowlabel */ 63 tcp_seq sc_irs; /* seq from peer */ 64 tcp_seq sc_iss; /* our ISS */ 65 struct mbuf *sc_ipopts; /* source route */ 66 u_int16_t sc_peer_mss; /* peer's MSS */ 67 u_int16_t sc_wnd; /* advertised window */ 68 u_int8_t sc_ip_ttl; /* IPv4 TTL */ 69 u_int8_t sc_ip_tos; /* IPv4 TOS */ 70 u_int8_t sc_requested_s_scale:4, 71 sc_requested_r_scale:4; 72 u_int16_t sc_flags; 73 #ifndef TCP_OFFLOAD_DISABLE 74 struct toe_usrreqs *sc_tu; /* TOE operations */ 75 void *sc_toepcb; /* TOE protocol block */ 76 #endif 77 #ifdef MAC 78 struct label *sc_label; /* MAC label reference */ 79 #endif 80 struct ucred *sc_cred; /* cred cache for jail checks */ 81 }; 82 83 /* 84 * Flags for the sc_flags field. 85 */ 86 #define SCF_NOOPT 0x01 /* no TCP options */ 87 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 88 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 89 /* MSS is implicit */ 90 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 91 #define SCF_SIGNATURE 0x20 /* send MD5 digests */ 92 #define SCF_SACK 0x80 /* send SACK option */ 93 #define SCF_ECN 0x100 /* send ECN setup packet */ 94 95 #define SYNCOOKIE_SECRET_SIZE 8 /* dwords */ 96 #define SYNCOOKIE_LIFETIME 16 /* seconds */ 97 98 struct syncache_head { 99 struct mtx sch_mtx; 100 TAILQ_HEAD(sch_head, syncache) sch_bucket; 101 struct callout sch_timer; 102 int sch_nextc; 103 u_int sch_length; 104 u_int sch_oddeven; 105 u_int32_t sch_secbits_odd[SYNCOOKIE_SECRET_SIZE]; 106 u_int32_t sch_secbits_even[SYNCOOKIE_SECRET_SIZE]; 107 u_int sch_reseed; /* time_uptime, seconds */ 108 }; 109 110 struct tcp_syncache { 111 struct syncache_head *hashbase; 112 uma_zone_t zone; 113 u_int hashsize; 114 u_int hashmask; 115 u_int bucket_limit; 116 u_int cache_count; /* XXX: unprotected */ 117 u_int cache_limit; 118 u_int rexmt_limit; 119 u_int hash_secret; 120 }; 121 122 #endif /* _KERNEL */ 123 #endif /* !_NETINET_TCP_SYNCACHE_H_ */ 124