2 * Copyright (c) 1982, 1986, 1993, 1994, 1995
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
33 #ifndef _NETINET_TCP_SYNCACHE_H_
34 #define _NETINET_TCP_SYNCACHE_H_
39 void syncache_init(void);
41 void syncache_destroy(void);
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);
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);
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;
78 #ifndef TCP_OFFLOAD_DISABLE
79 struct toe_usrreqs *sc_tu; /* TOE operations */
80 void *sc_toepcb; /* TOE protocol block */
82 struct label *sc_label; /* MAC label reference */
83 struct ucred *sc_cred; /* cred cache for jail checks */
85 u_int32_t sc_spare[2]; /* UTO */
89 * Flags for the sc_flags field.
91 #define SCF_NOOPT 0x01 /* no TCP options */
92 #define SCF_WINSCALE 0x02 /* negotiated window scaling */
93 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */
95 #define SCF_UNREACH 0x10 /* icmp unreachable received */
96 #define SCF_SIGNATURE 0x20 /* send MD5 digests */
97 #define SCF_SACK 0x80 /* send SACK option */
98 #define SCF_ECN 0x100 /* send ECN setup packet */
100 #define SYNCOOKIE_SECRET_SIZE 8 /* dwords */
101 #define SYNCOOKIE_LIFETIME 16 /* seconds */
103 struct syncache_head {
104 struct vnet *sch_vnet;
106 TAILQ_HEAD(sch_head, syncache) sch_bucket;
107 struct callout sch_timer;
111 u_int32_t sch_secbits_odd[SYNCOOKIE_SECRET_SIZE];
112 u_int32_t sch_secbits_even[SYNCOOKIE_SECRET_SIZE];
113 u_int sch_reseed; /* time_uptime, seconds */
116 struct tcp_syncache {
117 struct syncache_head *hashbase;
122 u_int cache_count; /* XXX: unprotected */
129 #endif /* !_NETINET_TCP_SYNCACHE_H_ */