1 /*-
2 * Copyright (c) 2015-2017 Patrick Kelsey
3 * 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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29 #ifndef _TCP_FASTOPEN_H_
30 #define _TCP_FASTOPEN_H_
31
32 #ifdef _KERNEL
33
34 #include "opt_inet.h"
35
36 #define TCP_FASTOPEN_COOKIE_LEN 8 /* SipHash24 64-bit output */
37
38 #ifdef TCP_RFC7413
39 VNET_DECLARE(unsigned int, tcp_fastopen_client_enable);
40 #define V_tcp_fastopen_client_enable VNET(tcp_fastopen_client_enable)
41
42 VNET_DECLARE(unsigned int, tcp_fastopen_server_enable);
43 #define V_tcp_fastopen_server_enable VNET(tcp_fastopen_server_enable)
44 #else
45 #define V_tcp_fastopen_client_enable 0
46 #define V_tcp_fastopen_server_enable 0
47 #endif /* TCP_RFC7413 */
48
49 union tcp_fastopen_ip_addr {
50 struct in_addr v4;
51 struct in6_addr v6;
52 };
53
54 struct tcp_fastopen_ccache_entry {
55 TAILQ_ENTRY(tcp_fastopen_ccache_entry) cce_link;
56 union tcp_fastopen_ip_addr cce_client_ip; /* network byte order */
57 union tcp_fastopen_ip_addr cce_server_ip; /* network byte order */
58 uint16_t server_port; /* network byte order */
59 uint16_t server_mss; /* host byte order */
60 uint8_t af;
61 uint8_t cookie_len;
62 uint8_t cookie[TCP_FASTOPEN_MAX_COOKIE_LEN];
63 sbintime_t disable_time; /* non-zero value means path is disabled */
64 };
65
66 struct tcp_fastopen_ccache;
67
68 struct tcp_fastopen_ccache_bucket {
69 struct mtx ccb_mtx;
70 TAILQ_HEAD(bucket_entries, tcp_fastopen_ccache_entry) ccb_entries;
71 int ccb_num_entries;
72 struct tcp_fastopen_ccache *ccb_ccache;
73 };
74
75 struct tcp_fastopen_ccache {
76 uma_zone_t zone;
77 struct tcp_fastopen_ccache_bucket *base;
78 unsigned int bucket_limit;
79 unsigned int buckets;
80 unsigned int mask;
81 uint32_t secret;
82 };
83
84 #ifdef TCP_RFC7413
85 void tcp_fastopen_init(void);
86 void tcp_fastopen_destroy(void);
87 unsigned int *tcp_fastopen_alloc_counter(void);
88 void tcp_fastopen_decrement_counter(unsigned int *);
89 int tcp_fastopen_check_cookie(struct in_conninfo *, uint8_t *, unsigned int,
90 uint64_t *);
91 void tcp_fastopen_connect(struct tcpcb *);
92 void tcp_fastopen_disable_path(struct tcpcb *);
93 void tcp_fastopen_update_cache(struct tcpcb *, uint16_t, uint8_t,
94 uint8_t *);
95 #else
96 #define tcp_fastopen_init() ((void)0)
97 #define tcp_fastopen_destroy() ((void)0)
98 #define tcp_fastopen_alloc_counter() NULL
99 #define tcp_fastopen_decrement_counter(c) ((void)0)
100 #define tcp_fastopen_check_cookie(i, c, l, lc) (-1)
101 #define tcp_fastopen_connect(t) ((void)0)
102 #define tcp_fastopen_disable_path(t) ((void)0)
103 #define tcp_fastopen_update_cache(t, m, l, c) ((void)0)
104 #endif /* TCP_RFC7413 */
105
106 #endif /* _KERNEL */
107
108 #endif /* _TCP_FASTOPEN_H_ */
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