bsd/netinet/mptcp_opt.h

   1 /*
   2  * Copyright (c) 2012-2017 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 #ifndef _NETINET_MPTCP_OPT_H_
  30 #define _NETINET_MPTCP_OPT_H_
  31
  32 #ifdef BSD_KERNEL_PRIVATE
  33
  34 /*
  35  * Try setting up an MPTCP connection by making atleast 3 attempts,
  36  * that is 2 retransmissions - needed for Weak WiFi and long delay cellular.
  37  * This number must be bumped higher when we are assured that middleboxes
  38  * are not the reason for retries. Generally, on weak wifi and cold start
  39  * cellular, more than 2 retries are necessary.
  40  */
  41 #define MPTCP_CAPABLE_RETRIES   (2)
  42
  43 __BEGIN_DECLS
  44 extern void mptcp_data_ack_rcvd(struct mptcb *mp_tp, struct tcpcb *tp, u_int64_t full_dack);
  45 extern void mptcp_update_window_fallback(struct tcpcb *tp);
  46 extern void tcp_do_mptcp_options(struct tcpcb *, u_char *, struct tcphdr *,
  47     struct tcpopt *, int);
  48 extern unsigned mptcp_setup_syn_opts(struct socket *, u_char*, unsigned);
  49 extern unsigned mptcp_setup_join_ack_opts(struct tcpcb *, u_char*, unsigned);
  50 extern unsigned int mptcp_setup_opts(struct tcpcb *tp, int32_t off, u_char *opt,
  51                                      unsigned int optlen, int flags, int len,
  52                                      boolean_t *p_mptcp_acknow);
  53 extern void mptcp_update_dss_rcv_state(struct mptcp_dsn_opt *, struct tcpcb *,
  54     uint16_t);
  55 extern void mptcp_update_rcv_state_meat(struct mptcb *, struct tcpcb *,
  56     u_int64_t, u_int32_t, u_int16_t, uint16_t);
  57 __END_DECLS
  58
  59 #endif /* BSD_KERNEL_PRIVATE */
  60 #endif /* !_NETINET_MPTCP_OPT_H_ */