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 static __inline void 97 tcp_fastopen_init(void) 98 { 99 } 100 101 static __inline void 102 tcp_fastopen_destroy(void) 103 { 104 } 105 106 static __inline unsigned int * 107 tcp_fastopen_alloc_counter(void) 108 { 109 return (NULL); 110 } 111 112 static __inline void 113 tcp_fastopen_decrement_counter(unsigned int *_counter) 114 { 115 } 116 117 static __inline int 118 tcp_fastopen_check_cookie(struct in_conninfo *_inc, uint8_t *_cookie, 119 unsigned int _len, uint64_t *_latest_cookie) 120 { 121 return (-1); 122 } 123 124 static __inline void 125 tcp_fastopen_connect(struct tcpcb *_tp) 126 { 127 } 128 129 static __inline void 130 tcp_fastopen_disable_path(struct tcpcb *_tp) 131 { 132 } 133 134 static __inline void 135 tcp_fastopen_update_cache(struct tcpcb *_tp, uint16_t _mss, uint8_t _cookie_len, 136 uint8_t *_cookie) 137 { 138 } 139 #endif /* TCP_RFC7413 */ 140 141 #endif /* _KERNEL */ 142 143 #endif /* _TCP_FASTOPEN_H_ */ 144