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 struct toeopt; 38 39 void syncache_init(void); 40 #ifdef VIMAGE 41 void syncache_destroy(void); 42 #endif 43 void syncache_unreach(struct in_conninfo *, struct tcphdr *); 44 int syncache_expand(struct in_conninfo *, struct tcpopt *, 45 struct tcphdr *, struct socket **, struct mbuf *); 46 int tcp_offload_syncache_expand(struct in_conninfo *inc, struct toeopt *toeo, 47 struct tcphdr *th, struct socket **lsop, struct mbuf *m); 48 void syncache_add(struct in_conninfo *, struct tcpopt *, 49 struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *); 50 void tcp_offload_syncache_add(struct in_conninfo *, struct toeopt *, 51 struct tcphdr *, struct inpcb *, struct socket **, 52 struct toe_usrreqs *tu, void *toepcb); 53 54 void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 55 void syncache_badack(struct in_conninfo *); 56 int syncache_pcbcount(void); 57 int syncache_pcblist(struct sysctl_req *req, int max_pcbs, int *pcbs_exported); 58 59 struct syncache { 60 TAILQ_ENTRY(syncache) sc_hash; 61 struct in_conninfo sc_inc; /* addresses */ 62 int sc_rxttime; /* retransmit time */ 63 u_int16_t sc_rxmits; /* retransmit counter */ 64 u_int32_t sc_tsreflect; /* timestamp to reflect */ 65 u_int32_t sc_ts; /* our timestamp to send */ 66 u_int32_t sc_tsoff; /* ts offset w/ syncookies */ 67 u_int32_t sc_flowlabel; /* IPv6 flowlabel */ 68 tcp_seq sc_irs; /* seq from peer */ 69 tcp_seq sc_iss; /* our ISS */ 70 struct mbuf *sc_ipopts; /* source route */ 71 u_int16_t sc_peer_mss; /* peer's MSS */ 72 u_int16_t sc_wnd; /* advertised window */ 73 u_int8_t sc_ip_ttl; /* IPv4 TTL */ 74 u_int8_t sc_ip_tos; /* IPv4 TOS */ 75 u_int8_t sc_requested_s_scale:4, 76 sc_requested_r_scale:4; 77 u_int16_t sc_flags; 78 #ifndef TCP_OFFLOAD_DISABLE 79 struct toe_usrreqs *sc_tu; /* TOE operations */ 80 void *sc_toepcb; /* TOE protocol block */ 81 #endif 82 struct label *sc_label; /* MAC label reference */ 83 struct ucred *sc_cred; /* cred cache for jail checks */ 84 }; 85 86 /* 87 * Flags for the sc_flags field. 88 */ 89 #define SCF_NOOPT 0x01 /* no TCP options */ 90 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 91 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 92 /* MSS is implicit */ 93 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 94 #define SCF_SIGNATURE 0x20 /* send MD5 digests */ 95 #define SCF_SACK 0x80 /* send SACK option */ 96 #define SCF_ECN 0x100 /* send ECN setup packet */ 97 98 #define SYNCOOKIE_SECRET_SIZE 8 /* dwords */ 99 #define SYNCOOKIE_LIFETIME 16 /* seconds */ 100 101 struct syncache_head { 102 struct vnet *sch_vnet; 103 struct mtx sch_mtx; 104 TAILQ_HEAD(sch_head, syncache) sch_bucket; 105 struct callout sch_timer; 106 int sch_nextc; 107 u_int sch_length; 108 u_int sch_oddeven; 109 u_int32_t sch_secbits_odd[SYNCOOKIE_SECRET_SIZE]; 110 u_int32_t sch_secbits_even[SYNCOOKIE_SECRET_SIZE]; 111 u_int sch_reseed; /* time_uptime, seconds */ 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_count; /* XXX: unprotected */ 121 u_int cache_limit; 122 u_int rexmt_limit; 123 u_int hash_secret; 124 }; 125 126 #endif /* _KERNEL */ 127 #endif /* !_NETINET_TCP_SYNCACHE_H_ */ 128