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 #ifdef VIMAGE 39 void syncache_destroy(void); 40 #endif 41 void syncache_unreach(struct in_conninfo *, struct tcphdr *); 42 int syncache_expand(struct in_conninfo *, struct tcpopt *, 43 struct tcphdr *, struct socket **, struct mbuf *); 44 int tcp_offload_syncache_expand(struct in_conninfo *inc, struct tcpopt *to, 45 struct tcphdr *th, struct socket **lsop, struct mbuf *m); 46 void syncache_add(struct in_conninfo *, struct tcpopt *, 47 struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *); 48 void tcp_offload_syncache_add(struct in_conninfo *, struct tcpopt *, 49 struct tcphdr *, struct inpcb *, struct socket **, 50 struct toe_usrreqs *tu, void *toepcb); 51 52 void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 53 void syncache_badack(struct in_conninfo *); 54 int syncache_pcbcount(void); 55 int syncache_pcblist(struct sysctl_req *req, int max_pcbs, int *pcbs_exported); 56 57 struct syncache { 58 TAILQ_ENTRY(syncache) sc_hash; 59 struct in_conninfo sc_inc; /* addresses */ 60 int sc_rxttime; /* retransmit time */ 61 u_int16_t sc_rxmits; /* retransmit counter */ 62 u_int32_t sc_tsreflect; /* timestamp to reflect */ 63 u_int32_t sc_ts; /* our timestamp to send */ 64 u_int32_t sc_tsoff; /* ts offset w/ syncookies */ 65 u_int32_t sc_flowlabel; /* IPv6 flowlabel */ 66 tcp_seq sc_irs; /* seq from peer */ 67 tcp_seq sc_iss; /* our ISS */ 68 struct mbuf *sc_ipopts; /* source route */ 69 u_int16_t sc_peer_mss; /* peer's MSS */ 70 u_int16_t sc_wnd; /* advertised window */ 71 u_int8_t sc_ip_ttl; /* IPv4 TTL */ 72 u_int8_t sc_ip_tos; /* IPv4 TOS */ 73 u_int8_t sc_requested_s_scale:4, 74 sc_requested_r_scale:4; 75 u_int16_t sc_flags; 76 #ifndef TCP_OFFLOAD_DISABLE 77 struct toe_usrreqs *sc_tu; /* TOE operations */ 78 void *sc_toepcb; /* TOE protocol block */ 79 #endif 80 struct label *sc_label; /* MAC label reference */ 81 struct ucred *sc_cred; /* cred cache for jail checks */ 82 }; 83 84 /* 85 * Flags for the sc_flags field. 86 */ 87 #define SCF_NOOPT 0x01 /* no TCP options */ 88 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 89 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 90 /* MSS is implicit */ 91 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 92 #define SCF_SIGNATURE 0x20 /* send MD5 digests */ 93 #define SCF_SACK 0x80 /* send SACK option */ 94 #define SCF_ECN 0x100 /* send ECN setup packet */ 95 96 #define SYNCOOKIE_SECRET_SIZE 8 /* dwords */ 97 #define SYNCOOKIE_LIFETIME 16 /* seconds */ 98 99 struct syncache_head { 100 struct vnet *sch_vnet; 101 struct mtx sch_mtx; 102 TAILQ_HEAD(sch_head, syncache) sch_bucket; 103 struct callout sch_timer; 104 int sch_nextc; 105 u_int sch_length; 106 u_int sch_oddeven; 107 u_int32_t sch_secbits_odd[SYNCOOKIE_SECRET_SIZE]; 108 u_int32_t sch_secbits_even[SYNCOOKIE_SECRET_SIZE]; 109 u_int sch_reseed; /* time_uptime, seconds */ 110 }; 111 112 struct tcp_syncache { 113 struct syncache_head *hashbase; 114 uma_zone_t zone; 115 u_int hashsize; 116 u_int hashmask; 117 u_int bucket_limit; 118 u_int cache_count; /* XXX: unprotected */ 119 u_int cache_limit; 120 u_int rexmt_limit; 121 u_int hash_secret; 122 }; 123 124 #endif /* _KERNEL */ 125 #endif /* !_NETINET_TCP_SYNCACHE_H_ */ 126