master
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
27#ifndef _TCP_FASTOPEN_H_
28#define _TCP_FASTOPEN_H_
29
30#ifdef _KERNEL
31
32#include "opt_inet.h"
33
34#define TCP_FASTOPEN_COOKIE_LEN 8 /* SipHash24 64-bit output */
35
36#ifdef TCP_RFC7413
37VNET_DECLARE(unsigned int, tcp_fastopen_client_enable);
38#define V_tcp_fastopen_client_enable VNET(tcp_fastopen_client_enable)
39
40VNET_DECLARE(unsigned int, tcp_fastopen_server_enable);
41#define V_tcp_fastopen_server_enable VNET(tcp_fastopen_server_enable)
42#else
43#define V_tcp_fastopen_client_enable 0
44#define V_tcp_fastopen_server_enable 0
45#endif /* TCP_RFC7413 */
46
47union tcp_fastopen_ip_addr {
48 struct in_addr v4;
49 struct in6_addr v6;
50};
51
52struct tcp_fastopen_ccache_entry {
53 TAILQ_ENTRY(tcp_fastopen_ccache_entry) cce_link;
54 union tcp_fastopen_ip_addr cce_client_ip; /* network byte order */
55 union tcp_fastopen_ip_addr cce_server_ip; /* network byte order */
56 uint16_t server_port; /* network byte order */
57 uint16_t server_mss; /* host byte order */
58 uint8_t af;
59 uint8_t cookie_len;
60 uint8_t cookie[TCP_FASTOPEN_MAX_COOKIE_LEN];
61 sbintime_t disable_time; /* non-zero value means path is disabled */
62};
63
64struct tcp_fastopen_ccache;
65
66struct tcp_fastopen_ccache_bucket {
67 struct mtx ccb_mtx;
68 TAILQ_HEAD(bucket_entries, tcp_fastopen_ccache_entry) ccb_entries;
69 int ccb_num_entries;
70 struct tcp_fastopen_ccache *ccb_ccache;
71};
72
73struct tcp_fastopen_ccache {
74 uma_zone_t zone;
75 struct tcp_fastopen_ccache_bucket *base;
76 unsigned int bucket_limit;
77 unsigned int buckets;
78 unsigned int mask;
79 uint32_t secret;
80};
81
82#ifdef TCP_RFC7413
83void tcp_fastopen_init(void);
84void tcp_fastopen_destroy(void);
85unsigned int *tcp_fastopen_alloc_counter(void);
86void tcp_fastopen_decrement_counter(unsigned int *);
87int tcp_fastopen_check_cookie(struct in_conninfo *, uint8_t *, unsigned int,
88 uint64_t *);
89void tcp_fastopen_connect(struct tcpcb *);
90void tcp_fastopen_disable_path(struct tcpcb *);
91void tcp_fastopen_update_cache(struct tcpcb *, uint16_t, uint8_t,
92 uint8_t *);
93#else
94static __inline void
95tcp_fastopen_init(void)
96{
97}
98
99static __inline void
100tcp_fastopen_destroy(void)
101{
102}
103
104static __inline unsigned int *
105tcp_fastopen_alloc_counter(void)
106{
107 return (NULL);
108}
109
110static __inline void
111tcp_fastopen_decrement_counter(unsigned int *_counter)
112{
113}
114
115static __inline int
116tcp_fastopen_check_cookie(struct in_conninfo *_inc, uint8_t *_cookie,
117 unsigned int _len, uint64_t *_latest_cookie)
118{
119 return (-1);
120}
121
122static __inline void
123tcp_fastopen_connect(struct tcpcb *_tp)
124{
125}
126
127static __inline void
128tcp_fastopen_disable_path(struct tcpcb *_tp)
129{
130}
131
132static __inline void
133tcp_fastopen_update_cache(struct tcpcb *_tp, uint16_t _mss, uint8_t _cookie_len,
134 uint8_t *_cookie)
135{
136}
137#endif /* TCP_RFC7413 */
138
139#endif /* _KERNEL */
140
141#endif /* _TCP_FASTOPEN_H_ */