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 37 VNET_DECLARE(unsigned int, tcp_fastopen_client_enable); 38 #define V_tcp_fastopen_client_enable VNET(tcp_fastopen_client_enable) 39 40 VNET_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 47 union tcp_fastopen_ip_addr { 48 struct in_addr v4; 49 struct in6_addr v6; 50 }; 51 52 struct 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 64 struct tcp_fastopen_ccache; 65 66 struct 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 73 struct 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 83 void tcp_fastopen_init(void); 84 void tcp_fastopen_destroy(void); 85 unsigned int *tcp_fastopen_alloc_counter(void); 86 void tcp_fastopen_decrement_counter(unsigned int *); 87 int tcp_fastopen_check_cookie(struct in_conninfo *, uint8_t *, unsigned int, 88 uint64_t *); 89 void tcp_fastopen_connect(struct tcpcb *); 90 void tcp_fastopen_disable_path(struct tcpcb *); 91 void tcp_fastopen_update_cache(struct tcpcb *, uint16_t, uint8_t, 92 uint8_t *); 93 #else 94 static __inline void 95 tcp_fastopen_init(void) 96 { 97 } 98 99 static __inline void 100 tcp_fastopen_destroy(void) 101 { 102 } 103 104 static __inline unsigned int * 105 tcp_fastopen_alloc_counter(void) 106 { 107 return (NULL); 108 } 109 110 static __inline void 111 tcp_fastopen_decrement_counter(unsigned int *_counter) 112 { 113 } 114 115 static __inline int 116 tcp_fastopen_check_cookie(struct in_conninfo *_inc, uint8_t *_cookie, 117 unsigned int _len, uint64_t *_latest_cookie) 118 { 119 return (-1); 120 } 121 122 static __inline void 123 tcp_fastopen_connect(struct tcpcb *_tp) 124 { 125 } 126 127 static __inline void 128 tcp_fastopen_disable_path(struct tcpcb *_tp) 129 { 130 } 131 132 static __inline void 133 tcp_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_ */ 142