sys/netinet/ip_carp.h

   1 /*      $FreeBSD$       */
   2 /*      $OpenBSD: ip_carp.h,v 1.8 2004/07/29 22:12:15 mcbride Exp $     */
   3
   4 /*
   5  * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
   6  * Copyright (c) 2003 Ryan McBride. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
  21  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  23  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  25  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  26  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  27  * THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #ifndef _IP_CARP_H
  31 #define _IP_CARP_H
  32
  33 /*
  34  * The CARP header layout is as follows:
  35  *
  36  *     0                   1                   2                   3
  37  *     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  38  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  39  *    |Version| Type  | VirtualHostID |    AdvSkew    |    Auth Len   |
  40  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  41  *    |   Reserved    |     AdvBase   |          Checksum             |
  42  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  43  *    |                         Counter (1)                           |
  44  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  45  *    |                         Counter (2)                           |
  46  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  47  *    |                        SHA-1 HMAC (1)                         |
  48  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  49  *    |                        SHA-1 HMAC (2)                         |
  50  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  51  *    |                        SHA-1 HMAC (3)                         |
  52  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  53  *    |                        SHA-1 HMAC (4)                         |
  54  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  55  *    |                        SHA-1 HMAC (5)                         |
  56  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  57  *
  58  */
  59
  60 struct carp_header {
  61 #if BYTE_ORDER == LITTLE_ENDIAN
  62         u_int8_t        carp_type:4,
  63                         carp_version:4;
  64 #endif
  65 #if BYTE_ORDER == BIG_ENDIAN
  66         u_int8_t        carp_version:4,
  67                         carp_type:4;
  68 #endif
  69         u_int8_t        carp_vhid;      /* virtual host id */
  70         u_int8_t        carp_advskew;   /* advertisement skew */
  71         u_int8_t        carp_authlen;   /* size of counter+md, 32bit chunks */
  72         u_int8_t        carp_pad1;      /* reserved */
  73         u_int8_t        carp_advbase;   /* advertisement interval */
  74         u_int16_t       carp_cksum;
  75         u_int32_t       carp_counter[2];
  76         unsigned char   carp_md[20];    /* SHA1 HMAC */
  77 } __packed;
  78
  79 #ifdef CTASSERT
  80 CTASSERT(sizeof(struct carp_header) == 36);
  81 #endif
  82
  83 #define CARP_DFLTTL             255
  84
  85 /* carp_version */
  86 #define CARP_VERSION            2
  87
  88 /* carp_type */
  89 #define CARP_ADVERTISEMENT      0x01
  90
  91 #define CARP_KEY_LEN            20      /* a sha1 hash of a passphrase */
  92
  93 /* carp_advbase */
  94 #define CARP_DFLTINTV           1
  95
  96 /*
  97  * Statistics.
  98  */
  99 struct carpstats {
 100         uint64_t        carps_ipackets;         /* total input packets, IPv4 */
 101         uint64_t        carps_ipackets6;        /* total input packets, IPv6 */
 102         uint64_t        carps_badif;            /* wrong interface */
 103         uint64_t        carps_badttl;           /* TTL is not CARP_DFLTTL */
 104         uint64_t        carps_hdrops;           /* packets shorter than hdr */
 105         uint64_t        carps_badsum;           /* bad checksum */
 106         uint64_t        carps_badver;           /* bad (incl unsupp) version */
 107         uint64_t        carps_badlen;           /* data length does not match */
 108         uint64_t        carps_badauth;          /* bad authentication */
 109         uint64_t        carps_badvhid;          /* bad VHID */
 110         uint64_t        carps_badaddrs;         /* bad address list */
 111
 112         uint64_t        carps_opackets;         /* total output packets, IPv4 */
 113         uint64_t        carps_opackets6;        /* total output packets, IPv6 */
 114         uint64_t        carps_onomem;           /* no memory for an mbuf */
 115         uint64_t        carps_ostates;          /* total state updates sent */
 116
 117         uint64_t        carps_preempt;          /* if enabled, preemptions */
 118 };
 119
 120 /*
 121  * Configuration structure for SIOCSVH SIOCGVH
 122  */
 123 struct carpreq {
 124         int             carpr_state;
 125 #define CARP_STATES     "INIT", "BACKUP", "MASTER"
 126 #define CARP_MAXSTATE   2
 127         int             carpr_vhid;
 128         int             carpr_advskew;
 129         int             carpr_advbase;
 130         unsigned char   carpr_key[CARP_KEY_LEN];
 131 };
 132 #define SIOCSVH _IOWR('i', 245, struct ifreq)
 133 #define SIOCGVH _IOWR('i', 246, struct ifreq)
 134
 135 /*
 136  * Names for CARP sysctl objects
 137  */
 138 #define CARPCTL_ALLOW           1       /* accept incoming CARP packets */
 139 #define CARPCTL_PREEMPT         2       /* high-pri backup preemption mode */
 140 #define CARPCTL_LOG             3       /* log bad packets */
 141 #define CARPCTL_STATS           4       /* statistics (read-only) */
 142 #define CARPCTL_ARPBALANCE      5       /* balance arp responses */
 143 #define CARPCTL_MAXID           6
 144
 145 #define CARPCTL_NAMES { \
 146         { 0, 0 }, \
 147         { "allow", CTLTYPE_INT }, \
 148         { "preempt", CTLTYPE_INT }, \
 149         { "log", CTLTYPE_INT }, \
 150         { "stats", CTLTYPE_STRUCT }, \
 151         { "arpbalance", CTLTYPE_INT }, \
 152 }
 153
 154 #ifdef _KERNEL
 155 void             carp_carpdev_state(void *);
 156 void             carp_input (struct mbuf *, int);
 157 int              carp6_input (struct mbuf **, int *, int);
 158 int              carp_output (struct ifnet *, struct mbuf *, struct sockaddr *,
 159                      struct rtentry *);
 160 int              carp_iamatch (void *, struct in_ifaddr *, struct in_addr *,
 161                      u_int8_t **);
 162 struct ifaddr   *carp_iamatch6(void *, struct in6_addr *);
 163 void            *carp_macmatch6(void *, struct mbuf *, const struct in6_addr *);
 164 struct  ifnet   *carp_forus (void *, void *);
 165 #endif
 166 #endif /* _IP_CARP_H */