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

     /*      $NetBSD: tcp_syncache.h,v 1.2 2022/09/20 10:12:18 ozaki-r Exp $ */
     
     /*
      * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the project nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    /*
     *      @(#)COPYRIGHT   1.1 (NRL) 17 January 1995
     *
     * NRL grants permission for redistribution and use in source and binary
     * forms, with or without modification, of the software and documentation
     * created at NRL provided that the following conditions are met:
     *
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgements:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     *      This product includes software developed at the Information
     *      Technology Division, US Naval Research Laboratory.
     * 4. Neither the name of the NRL nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS
     * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
     * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL NRL OR
     * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * The views and conclusions contained in the software and documentation
     * are those of the authors and should not be interpreted as representing
     * official policies, either expressed or implied, of the US Naval
     * Research Laboratory (NRL).
     */
    
    /*-
     * Copyright (c) 1997, 1998, 1999, 2001, 2005 The NetBSD Foundation, Inc.
     * All rights reserved.
     *
     * This code is derived from software contributed to The NetBSD Foundation
     * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
     * NASA Ames Research Center.
     * This code is derived from software contributed to The NetBSD Foundation
     * by Charles M. Hannum.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    * POSSIBILITY OF SUCH DAMAGE.
    */
   
   /*
    * Copyright (c) 1982, 1986, 1993, 1994, 1995
    *      The Regents of the University of California.  All rights reserved.
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    * 1. Redistributions of source code must retain the above copyright
    *    notice, this list of conditions and the following disclaimer.
    * 2. Redistributions in binary form must reproduce the above copyright
    *    notice, this list of conditions and the following disclaimer in the
    *    documentation and/or other materials provided with the distribution.
    * 3. Neither the name of the University nor the names of its contributors
    *    may be used to endorse or promote products derived from this software
    *    without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
    * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
    * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    * SUCH DAMAGE.
    *
    *      @(#)tcp_var.h   8.4 (Berkeley) 5/24/95
    */
   
   #ifndef _NETINET_TCP_SYNCACHE_H_
   #define _NETINET_TCP_SYNCACHE_H_
   
   #if defined(_KERNEL_OPT)
   #include "opt_inet.h"
   #include "opt_mbuftrace.h"
   #endif
   
   #ifdef _KERNEL
   #include <sys/callout.h>
   #include <sys/mbuf.h>
   #include <sys/queue.h>
   
   #include <net/route.h>
   
   /*
    * Data for the TCP compressed state engine.
    */
   union syn_cache_sa {
           struct sockaddr sa;
           struct sockaddr_in sin;
   #if 1 /*def INET6*/
           struct sockaddr_in6 sin6;
   #endif
   };
   
   struct syn_cache {
           TAILQ_ENTRY(syn_cache) sc_bucketq;      /* link on bucket list */
           callout_t sc_timer;                     /* rexmt timer */
           struct route sc_route;
           long sc_win;                            /* advertised window */
           int sc_bucketidx;                       /* our bucket index */
           u_int32_t sc_hash;
           u_int32_t sc_timestamp;                 /* timestamp from SYN */
           u_int32_t sc_timebase;                  /* our local timebase */
           union syn_cache_sa sc_src;
           union syn_cache_sa sc_dst;
           tcp_seq sc_irs;
           tcp_seq sc_iss;
           u_int sc_rxtcur;                        /* current rxt timeout */
           u_int sc_rxttot;                        /* total time spend on queues */
           u_short sc_rxtshift;                    /* for computing backoff */
           u_short sc_flags;
   
   #define SCF_UNREACH             0x0001          /* we've had an unreach error */
   #define SCF_TIMESTAMP           0x0002          /* peer will do timestamps */
   #define SCF_DEAD                0x0004          /* this entry to be released */
   #define SCF_SACK_PERMIT         0x0008          /* peer will do SACK */
   #define SCF_ECN_PERMIT          0x0010          /* peer will do ECN */
   #define SCF_SIGNATURE   0x40                    /* send MD5 digests */
   
           struct mbuf *sc_ipopts;                 /* IP options */
           u_int16_t sc_peermaxseg;
           u_int16_t sc_ourmaxseg;
           u_int8_t sc_request_r_scale     : 4,
                    sc_requested_s_scale   : 4;
   
           struct tcpcb *sc_tp;                    /* tcb for listening socket */
           LIST_ENTRY(syn_cache) sc_tpq;           /* list of entries by same tp */
   };
   
   struct syn_cache_head {
           TAILQ_HEAD(, syn_cache) sch_bucket;     /* bucket entries */
           u_short sch_length;                     /* # entries in bucket */
   };
   
   extern  int tcp_syn_bucket_limit;/* max entries per hash bucket */
   extern  int tcp_syn_cache_limit; /* max entries for compressed state engine */
   extern  u_long syn_cache_count;
   
   int      syn_cache_add(struct sockaddr *, struct sockaddr *,
                   struct tcphdr *, unsigned int, struct socket *,
                   struct mbuf *, u_char *, int, struct tcp_opt_info *);
   void     syn_cache_unreach(const struct sockaddr *, const struct sockaddr *,
              struct tcphdr *);
   struct socket
           *syn_cache_get(struct sockaddr *, struct sockaddr *,
                   struct tcphdr *, struct socket *so, struct mbuf *);
   void     syn_cache_init(void);
   void     syn_cache_insert(struct syn_cache *, struct tcpcb *);
   void     syn_cache_reset(struct sockaddr *, struct sockaddr *,
                   struct tcphdr *);
   void     syn_cache_cleanup(struct tcpcb *);
   #endif
   
   #endif /* !_NETINET_TCP_SYNCACHE_H_ */

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