1/*
2 * Copyright (c) 2015-2016 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
40extern void tcp_cache_set_cookie(struct tcpcb *tp, u_char *cookie, u_int8_t len);
41extern int tcp_cache_get_cookie(struct tcpcb *tp, u_char *cookie, u_int8_t *len);
42extern unsigned int tcp_cache_get_cookie_len(struct tcpcb *tp);
43extern uint8_t tcp_cache_get_mptcp_version(struct sockaddr* dst);
44extern void tcp_cache_update_mptcp_version(struct tcpcb *tp, boolean_t succeeded);
45
46extern void tcp_heuristic_tfo_loss(struct tcpcb *tp);
47extern void tcp_heuristic_tfo_rst(struct tcpcb *tp);
48extern void tcp_heuristic_mptcp_loss(struct tcpcb *tp);
49extern void tcp_heuristic_ecn_loss(struct tcpcb *tp);
50extern void tcp_heuristic_tfo_middlebox(struct tcpcb *tp);
51extern void tcp_heuristic_ecn_aggressive(struct tcpcb *tp);
52extern void tcp_heuristic_tfo_success(struct tcpcb *tp);
53extern void tcp_heuristic_mptcp_success(struct tcpcb *tp);
54extern void tcp_heuristic_ecn_success(struct tcpcb *tp);
55extern boolean_t tcp_heuristic_do_tfo(struct tcpcb *tp);
56extern int tcp_heuristic_do_mptcp(struct tcpcb *tp);
57extern boolean_t tcp_heuristic_do_ecn(struct tcpcb *tp);
58extern void tcp_heuristic_ecn_droprst(struct tcpcb *tp);
59extern void tcp_heuristic_ecn_droprxmt(struct tcpcb *tp);
60extern void tcp_heuristic_ecn_synrst(struct tcpcb *tp);
61
62extern boolean_t tcp_heuristic_do_ecn_with_address(struct ifnet *ifp,
63 union sockaddr_in_4_6 *local_address);
64extern void tcp_heuristics_ecn_update(struct necp_tcp_ecn_cache *necp_buffer,
65 struct ifnet *ifp, union sockaddr_in_4_6 *local_address);
66extern 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 *cookie, u_int8_t *cookie_len);
69extern 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
73extern void tcp_cache_init(void);
74
75#endif /* _NETINET_TCP_CACHE_H */
76