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 *, tcp_seq);
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_pcblist(struct sysctl_req *req, int max_pcbs, int *pcbs_exported);
50
51 struct syncache {
52 TAILQ_ENTRY(syncache) sc_hash;
53 struct in_conninfo sc_inc; /* addresses */
54 int sc_rxttime; /* retransmit time */
55 u_int16_t sc_rxmits; /* retransmit counter */
56 u_int32_t sc_tsreflect; /* timestamp to reflect */
57 u_int32_t sc_tsoff; /* ts offset w/ syncookies */
58 u_int32_t sc_flowlabel; /* IPv6 flowlabel */
59 tcp_seq sc_irs; /* seq from peer */
60 tcp_seq sc_iss; /* our ISS */
61 struct mbuf *sc_ipopts; /* source route */
62 u_int16_t sc_peer_mss; /* peer's MSS */
63 u_int16_t sc_wnd; /* advertised window */
64 u_int8_t sc_ip_ttl; /* IPv4 TTL */
65 u_int8_t sc_ip_tos; /* IPv4 TOS */
66 u_int8_t sc_requested_s_scale:4,
67 sc_requested_r_scale:4;
68 u_int16_t sc_flags;
69 #if defined(TCP_OFFLOAD) || !defined(TCP_OFFLOAD_DISABLE)
70 struct toedev *sc_tod; /* entry added by this TOE */
71 void *sc_todctx; /* TOE driver context */
72 #endif
73 struct label *sc_label; /* MAC label reference */
74 struct ucred *sc_cred; /* cred cache for jail checks */
75 #ifdef TCP_RFC7413
76 void *sc_tfo_cookie; /* for TCP Fast Open response */
77 #endif
78 void *sc_pspare; /* TCP_SIGNATURE */
79 u_int32_t sc_spare[2]; /* UTO */
80 };
81
82 /*
83 * Flags for the sc_flags field.
84 */
85 #define SCF_NOOPT 0x01 /* no TCP options */
86 #define SCF_WINSCALE 0x02 /* negotiated window scaling */
87 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */
88 /* MSS is implicit */
89 #define SCF_UNREACH 0x10 /* icmp unreachable received */
90 #define SCF_SIGNATURE 0x20 /* send MD5 digests */
91 #define SCF_SACK 0x80 /* send SACK option */
92 #define SCF_ECN 0x100 /* send ECN setup packet */
93
94 struct syncache_head {
95 struct mtx sch_mtx;
96 TAILQ_HEAD(sch_head, syncache) sch_bucket;
97 struct callout sch_timer;
98 int sch_nextc;
99 u_int sch_length;
100 struct tcp_syncache *sch_sc;
101 time_t sch_last_overflow;
102 };
103
104 #define SYNCOOKIE_SECRET_SIZE 16
105 #define SYNCOOKIE_LIFETIME 15 /* seconds */
106
107 struct syncookie_secret {
108 volatile u_int oddeven;
109 uint8_t key[2][SYNCOOKIE_SECRET_SIZE];
110 struct callout reseed;
111 u_int lifetime;
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_limit;
121 u_int rexmt_limit;
122 uint32_t hash_secret;
123 struct vnet *vnet;
124 struct syncookie_secret secret;
125 };
126
127 /* Internal use for the syncookie functions. */
128 union syncookie {
129 uint8_t cookie;
130 struct {
131 uint8_t odd_even:1,
132 sack_ok:1,
133 wscale_idx:3,
134 mss_idx:3;
135 } flags;
136 };
137
138 #endif /* _KERNEL */
139 #endif /* !_NETINET_TCP_SYNCACHE_H_ */
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