The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_fastopen.h

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    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  * $FreeBSD: releng/12.0/sys/netinet/tcp_fastopen.h 330002 2018-02-26 03:03:41Z pkelsey $
   27  */
   28 
   29 #ifndef _TCP_FASTOPEN_H_
   30 #define _TCP_FASTOPEN_H_
   31 
   32 #ifdef _KERNEL
   33 
   34 #include "opt_inet.h"
   35 
   36 #define TCP_FASTOPEN_COOKIE_LEN         8       /* SipHash24 64-bit output */
   37 
   38 #ifdef TCP_RFC7413
   39 VNET_DECLARE(unsigned int, tcp_fastopen_client_enable);
   40 #define V_tcp_fastopen_client_enable    VNET(tcp_fastopen_client_enable)
   41 
   42 VNET_DECLARE(unsigned int, tcp_fastopen_server_enable);
   43 #define V_tcp_fastopen_server_enable    VNET(tcp_fastopen_server_enable)
   44 #else
   45 #define V_tcp_fastopen_client_enable    0
   46 #define V_tcp_fastopen_server_enable    0
   47 #endif  /* TCP_RFC7413 */
   48 
   49 union tcp_fastopen_ip_addr {
   50         struct in_addr v4;
   51         struct in6_addr v6;
   52 };
   53 
   54 struct tcp_fastopen_ccache_entry {
   55         TAILQ_ENTRY(tcp_fastopen_ccache_entry) cce_link;
   56         union tcp_fastopen_ip_addr cce_client_ip;       /* network byte order */
   57         union tcp_fastopen_ip_addr cce_server_ip;       /* network byte order */
   58         uint16_t server_port;                           /* network byte order */
   59         uint16_t server_mss;                            /* host byte order */
   60         uint8_t af;
   61         uint8_t cookie_len;
   62         uint8_t cookie[TCP_FASTOPEN_MAX_COOKIE_LEN];
   63         sbintime_t disable_time; /* non-zero value means path is disabled */
   64 };
   65 
   66 struct tcp_fastopen_ccache;
   67 
   68 struct tcp_fastopen_ccache_bucket {
   69         struct mtx      ccb_mtx;
   70         TAILQ_HEAD(bucket_entries, tcp_fastopen_ccache_entry) ccb_entries;
   71         int             ccb_num_entries;
   72         struct tcp_fastopen_ccache *ccb_ccache;
   73 };
   74 
   75 struct tcp_fastopen_ccache {
   76         uma_zone_t      zone;
   77         struct tcp_fastopen_ccache_bucket *base;
   78         unsigned int    bucket_limit;
   79         unsigned int    buckets;
   80         unsigned int    mask;
   81         uint32_t        secret;
   82 };
   83 
   84 #ifdef TCP_RFC7413
   85 void    tcp_fastopen_init(void);
   86 void    tcp_fastopen_destroy(void);
   87 unsigned int *tcp_fastopen_alloc_counter(void);
   88 void    tcp_fastopen_decrement_counter(unsigned int *);
   89 int     tcp_fastopen_check_cookie(struct in_conninfo *, uint8_t *, unsigned int,
   90             uint64_t *);
   91 void    tcp_fastopen_connect(struct tcpcb *);
   92 void    tcp_fastopen_disable_path(struct tcpcb *);
   93 void    tcp_fastopen_update_cache(struct tcpcb *, uint16_t, uint8_t,
   94             uint8_t *);
   95 #else
   96 #define tcp_fastopen_init()                     ((void)0)
   97 #define tcp_fastopen_destroy()                  ((void)0)
   98 #define tcp_fastopen_alloc_counter()            NULL
   99 #define tcp_fastopen_decrement_counter(c)       ((void)0)
  100 #define tcp_fastopen_check_cookie(i, c, l, lc)  (-1)
  101 #define tcp_fastopen_connect(t)                 ((void)0)
  102 #define tcp_fastopen_disable_path(t)            ((void)0)
  103 #define tcp_fastopen_update_cache(t, m, l, c)   ((void)0)
  104 #endif /* TCP_RFC7413 */
  105 
  106 #endif /* _KERNEL */
  107 
  108 #endif /* _TCP_FASTOPEN_H_ */

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