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: releng/10.4/sys/netinet/tcp_syncache.h 322315 2017-08-09 13:26:12Z tuexen $
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 syncache_add(struct in_conninfo *, struct tcpopt *,
45 struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *,
46 void *, void *);
47 void syncache_chkrst(struct in_conninfo *, struct tcphdr *);
48 void syncache_badack(struct in_conninfo *);
49 int syncache_pcbcount(void);
50 int syncache_pcblist(struct sysctl_req *req, int max_pcbs, int *pcbs_exported);
51
52 struct syncache {
53 TAILQ_ENTRY(syncache) sc_hash;
54 struct in_conninfo sc_inc; /* addresses */
55 int sc_rxttime; /* retransmit time */
56 u_int16_t sc_rxmits; /* retransmit counter */
57 u_int32_t sc_tsreflect; /* timestamp to reflect */
58 u_int32_t sc_ts; /* our timestamp to send */
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 #ifdef TCP_RFC7413
78 void *sc_tfo_cookie; /* for TCP Fast Open response */
79 #endif
80 void *sc_pspare; /* TCP_SIGNATURE */
81 u_int32_t sc_spare[2]; /* UTO */
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 struct syncache_head {
97 struct mtx sch_mtx;
98 TAILQ_HEAD(sch_head, syncache) sch_bucket;
99 struct callout sch_timer;
100 int sch_nextc;
101 u_int sch_length;
102 struct tcp_syncache *sch_sc;
103 time_t sch_last_overflow;
104 };
105
106 #define SYNCOOKIE_SECRET_SIZE 16
107 #define SYNCOOKIE_LIFETIME 15 /* seconds */
108
109 struct syncookie_secret {
110 volatile u_int oddeven;
111 uint8_t key[2][SYNCOOKIE_SECRET_SIZE];
112 struct callout reseed;
113 u_int lifetime;
114 };
115
116 struct tcp_syncache {
117 struct syncache_head *hashbase;
118 uma_zone_t zone;
119 u_int hashsize;
120 u_int hashmask;
121 u_int bucket_limit;
122 u_int cache_limit;
123 u_int rexmt_limit;
124 u_int hash_secret;
125 struct vnet *vnet;
126 struct syncookie_secret secret;
127 };
128
129 /* Internal use for the syncookie functions. */
130 union syncookie {
131 uint8_t cookie;
132 struct {
133 uint8_t odd_even:1,
134 sack_ok:1,
135 wscale_idx:3,
136 mss_idx:3;
137 } flags;
138 };
139
140 #endif /* _KERNEL */
141 #endif /* !_NETINET_TCP_SYNCACHE_H_ */
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