1 /* 2 * Copyright (c) 2015-2024 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29 /* TCP-cache to store and retrieve TCP-related information */ 30 31 #ifndef _NETINET_TCP_CACHE_H 32 #define _NETINET_TCP_CACHE_H 33 34 #include <netinet/tcp_var.h> 35 #include <netinet/in.h> 36 37 #define ECN_MIN_CE_PROBES 10 /* Probes are basically the number of incoming packets */ 38 #define ECN_MAX_CE_RATIO 7 /* Ratio is the maximum number of CE-packets we accept per incoming "probe" */ 39 40 extern void tcp_cache_set_cookie(struct tcpcb *tp, u_char *__counted_by(len) cookie, u_int8_t len); 41 extern int tcp_cache_get_cookie(struct tcpcb *tp, u_char *__counted_by(buflen) cookie, uint8_t buflen, u_int8_t *len); 42 extern unsigned int tcp_cache_get_cookie_len(struct tcpcb *tp); 43 extern uint8_t tcp_cache_get_mptcp_version(struct sockaddr* dst); 44 extern void tcp_cache_update_mptcp_version(struct tcpcb *tp, boolean_t succeeded); 45 46 extern void tcp_heuristic_tfo_loss(struct tcpcb *tp); 47 extern void tcp_heuristic_tfo_rst(struct tcpcb *tp); 48 extern void tcp_heuristic_mptcp_loss(struct tcpcb *tp); 49 extern void tcp_heuristic_ecn_loss(struct tcpcb *tp); 50 extern void tcp_heuristic_tfo_middlebox(struct tcpcb *tp); 51 extern void tcp_heuristic_ecn_aggressive(struct tcpcb *tp); 52 extern void tcp_heuristic_tfo_success(struct tcpcb *tp); 53 extern void tcp_heuristic_mptcp_success(struct tcpcb *tp); 54 extern void tcp_heuristic_ecn_success(struct tcpcb *tp); 55 extern boolean_t tcp_heuristic_do_tfo(struct tcpcb *tp); 56 extern int tcp_heuristic_do_mptcp(struct tcpcb *tp); 57 extern boolean_t tcp_heuristic_do_ecn(struct tcpcb *tp); 58 extern void tcp_heuristic_ecn_droprst(struct tcpcb *tp); 59 extern void tcp_heuristic_ecn_droprxmt(struct tcpcb *tp); 60 extern void tcp_heuristic_ecn_synrst(struct tcpcb *tp); 61 62 extern boolean_t tcp_heuristic_do_ecn_with_address(struct ifnet *ifp, 63 union sockaddr_in_4_6 *local_address); 64 extern void tcp_heuristics_ecn_update(struct necp_tcp_ecn_cache *necp_buffer, 65 struct ifnet *ifp, union sockaddr_in_4_6 *local_address); 66 extern boolean_t tcp_heuristic_do_tfo_with_address(struct ifnet *ifp, 67 union sockaddr_in_4_6 *local_address, union sockaddr_in_4_6 *remote_address, 68 u_int8_t *__counted_by(maxlen) cookie, u_int8_t maxlen, u_int8_t *cookie_len); 69 extern void tcp_heuristics_tfo_update(struct necp_tcp_tfo_cache *necp_buffer, 70 struct ifnet *ifp, union sockaddr_in_4_6 *local_address, 71 union sockaddr_in_4_6 *remote_address); 72 73 extern void tcp_cache_init(void); 74 75 #endif /* _NETINET_TCP_CACHE_H */ 76