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_syncache.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1993, 1994, 1995
    3  *      The Regents of the University of California.  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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)tcp_var.h   8.4 (Berkeley) 5/24/95
   30  * $FreeBSD: releng/10.2/sys/netinet/tcp_syncache.h 255759 2013-09-21 10:01:51Z bz $
   31  */
   32 
   33 #ifndef _NETINET_TCP_SYNCACHE_H_
   34 #define _NETINET_TCP_SYNCACHE_H_
   35 #ifdef _KERNEL
   36 
   37 void     syncache_init(void);
   38 #ifdef VIMAGE
   39 void    syncache_destroy(void);
   40 #endif
   41 void     syncache_unreach(struct in_conninfo *, struct tcphdr *);
   42 int      syncache_expand(struct in_conninfo *, struct tcpopt *,
   43              struct tcphdr *, struct socket **, struct mbuf *);
   44 void     syncache_add(struct in_conninfo *, struct tcpopt *,
   45              struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *,
   46              void *, void *);
   47 void     syncache_chkrst(struct in_conninfo *, struct tcphdr *);
   48 void     syncache_badack(struct in_conninfo *);
   49 int      syncache_pcbcount(void);
   50 int      syncache_pcblist(struct sysctl_req *req, int max_pcbs, int *pcbs_exported);
   51 
   52 struct syncache {
   53         TAILQ_ENTRY(syncache)   sc_hash;
   54         struct          in_conninfo sc_inc;     /* addresses */
   55         int             sc_rxttime;             /* retransmit time */
   56         u_int16_t       sc_rxmits;              /* retransmit counter */
   57         u_int32_t       sc_tsreflect;           /* timestamp to reflect */
   58         u_int32_t       sc_ts;                  /* our timestamp to send */
   59         u_int32_t       sc_tsoff;               /* ts offset w/ syncookies */
   60         u_int32_t       sc_flowlabel;           /* IPv6 flowlabel */
   61         tcp_seq         sc_irs;                 /* seq from peer */
   62         tcp_seq         sc_iss;                 /* our ISS */
   63         struct          mbuf *sc_ipopts;        /* source route */
   64         u_int16_t       sc_peer_mss;            /* peer's MSS */
   65         u_int16_t       sc_wnd;                 /* advertised window */
   66         u_int8_t        sc_ip_ttl;              /* IPv4 TTL */
   67         u_int8_t        sc_ip_tos;              /* IPv4 TOS */
   68         u_int8_t        sc_requested_s_scale:4,
   69                         sc_requested_r_scale:4;
   70         u_int16_t       sc_flags;
   71 #if defined(TCP_OFFLOAD) || !defined(TCP_OFFLOAD_DISABLE)
   72         struct toedev   *sc_tod;                /* entry added by this TOE */
   73         void            *sc_todctx;             /* TOE driver context */
   74 #endif
   75         struct label    *sc_label;              /* MAC label reference */
   76         struct ucred    *sc_cred;               /* cred cache for jail checks */
   77 
   78         void            *sc_pspare;             /* TCP_SIGNATURE */
   79         u_int32_t       sc_spare[2];            /* UTO */
   80 };
   81 
   82 /*
   83  * Flags for the sc_flags field.
   84  */
   85 #define SCF_NOOPT       0x01                    /* no TCP options */
   86 #define SCF_WINSCALE    0x02                    /* negotiated window scaling */
   87 #define SCF_TIMESTAMP   0x04                    /* negotiated timestamps */
   88                                                 /* MSS is implicit */
   89 #define SCF_UNREACH     0x10                    /* icmp unreachable received */
   90 #define SCF_SIGNATURE   0x20                    /* send MD5 digests */
   91 #define SCF_SACK        0x80                    /* send SACK option */
   92 #define SCF_ECN         0x100                   /* send ECN setup packet */
   93 
   94 struct syncache_head {
   95         struct mtx      sch_mtx;
   96         TAILQ_HEAD(sch_head, syncache)  sch_bucket;
   97         struct callout  sch_timer;
   98         int             sch_nextc;
   99         u_int           sch_length;
  100         struct tcp_syncache *sch_sc;
  101 };
  102 
  103 #define SYNCOOKIE_SECRET_SIZE   16
  104 #define SYNCOOKIE_LIFETIME      15              /* seconds */
  105 
  106 struct syncookie_secret {
  107         volatile u_int oddeven;
  108         uint8_t key[2][SYNCOOKIE_SECRET_SIZE];
  109         struct callout reseed;
  110         u_int lifetime;
  111 };
  112 
  113 struct tcp_syncache {
  114         struct  syncache_head *hashbase;
  115         uma_zone_t zone;
  116         u_int   hashsize;
  117         u_int   hashmask;
  118         u_int   bucket_limit;
  119         u_int   cache_limit;
  120         u_int   rexmt_limit;
  121         u_int   hash_secret;
  122         struct vnet *vnet;
  123         struct syncookie_secret secret;
  124 };
  125 
  126 /* Internal use for the syncookie functions. */
  127 union syncookie {
  128         uint8_t cookie;
  129         struct {
  130                 uint8_t odd_even:1,
  131                         sack_ok:1,
  132                         wscale_idx:3,
  133                         mss_idx:3;
  134         } flags;
  135 };
  136 
  137 #endif /* _KERNEL */
  138 #endif /* !_NETINET_TCP_SYNCACHE_H_ */

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