bsd/netinet/tcp_cache.h

   1 /*
   2  * Copyright (c) 2015 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 /* Number of SYN-losses we accept */
  38 #define TFO_MAX_COOKIE_LOSS     2
  39 #define ECN_MAX_SYN_LOSS        2
  40
  41 #define ECN_MIN_CE_PROBES       10 /* Probes are basically the number of incoming packets */
  42 #define ECN_MAX_CE_RATIO        7 /* Ratio is the maximum number of CE-packets we accept per incoming "probe" */
  43
  44 extern void tcp_cache_set_cookie(struct tcpcb *tp, u_char *cookie, u_int8_t len);
  45 extern int tcp_cache_get_cookie(struct tcpcb *tp, u_char *cookie, u_int8_t *len);
  46 extern unsigned int tcp_cache_get_cookie_len(struct tcpcb *tp);
  47
  48 extern void tcp_heuristic_inc_loss(struct tcpcb *tp, int tfo, int ecn);
  49 extern void tcp_heuristic_tfo_snd_good(struct tcpcb *tp);
  50 extern void tcp_heuristic_tfo_rcv_good(struct tcpcb *tp);
  51 extern void tcp_heuristic_tfo_middlebox(struct tcpcb *tp);
  52 extern void tcp_heuristic_ecn_aggressive(struct tcpcb *tp);
  53 extern void tcp_heuristic_reset_loss(struct tcpcb *tp, int tfo, int ecn);
  54 extern void tcp_heuristic_tfo_success(struct tcpcb *tp);
  55 extern boolean_t tcp_heuristic_do_tfo(struct tcpcb *tp);
  56 extern boolean_t tcp_heuristic_do_ecn(struct tcpcb *tp);
  57
  58 extern void tcp_cache_init(void);
  59
  60 #endif /* _NETINET_TCP_CACHE_H */
  61