sys/netinet/ip_carp.h

   1 /*
   2  * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
   3  * Copyright (c) 2003 Ryan McBride. 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 ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
  18  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  20  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  22  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  23  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  24  * THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26 /*
  27  * $FreeBSD: src/sys/netinet/ip_carp.h,v 1.3 2006/12/01 18:37:41 imp Exp $
  28  * $OpenBSD: ip_carp.h,v 1.8 2004/07/29 22:12:15 mcbride Exp $
  29  * $DragonFly: src/sys/netinet/ip_carp.h,v 1.1 2007/08/16 20:03:57 dillon Exp $
  30  */
  31
  32
  33 #ifndef _IP_CARP_H
  34 #define _IP_CARP_H
  35
  36 #include <sys/ioccom.h>
  37
  38 /*
  39  * The CARP header layout is as follows:
  40  *
  41  *     0                   1                   2                   3
  42  *     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
  43  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  44  *    |Version| Type  | VirtualHostID |    AdvSkew    |    Auth Len   |
  45  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  46  *    |   Reserved    |     AdvBase   |          Checksum             |
  47  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  48  *    |                         Counter (1)                           |
  49  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  50  *    |                         Counter (2)                           |
  51  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  52  *    |                        SHA-1 HMAC (1)                         |
  53  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  54  *    |                        SHA-1 HMAC (2)                         |
  55  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  56  *    |                        SHA-1 HMAC (3)                         |
  57  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  58  *    |                        SHA-1 HMAC (4)                         |
  59  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  60  *    |                        SHA-1 HMAC (5)                         |
  61  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  62  *
  63  */
  64
  65 struct carp_header {
  66 #if BYTE_ORDER == LITTLE_ENDIAN
  67         uint8_t         carp_type:4,
  68                         carp_version:4;
  69 #endif
  70 #if BYTE_ORDER == BIG_ENDIAN
  71         uint8_t         carp_version:4,
  72                         carp_type:4;
  73 #endif
  74         uint8_t         carp_vhid;      /* virtual host id */
  75         uint8_t         carp_advskew;   /* advertisement skew */
  76         uint8_t         carp_authlen;   /* size of counter+md, 32bit chunks */
  77         uint8_t         carp_pad1;      /* reserved */
  78         uint8_t         carp_advbase;   /* advertisement interval */
  79         uint16_t        carp_cksum;
  80         uint32_t        carp_counter[2];
  81         unsigned char   carp_md[20];    /* SHA1 HMAC */
  82 } __packed;
  83
  84 #ifdef CTASSERT
  85 CTASSERT(sizeof(struct carp_header) == 36);
  86 #endif
  87
  88 #define CARP_DFLTTL             255
  89
  90 /* carp_version */
  91 #define CARP_VERSION            2
  92
  93 /* carp_type */
  94 #define CARP_ADVERTISEMENT      0x01
  95
  96 #define CARP_KEY_LEN            20      /* a sha1 hash of a passphrase */
  97
  98 /* carp_advbase */
  99 #define CARP_DFLTINTV           1
 100
 101 /*
 102  * Statistics.
 103  */
 104 struct carpstats {
 105         uint64_t        carps_ipackets;         /* total input packets, IPv4 */
 106         uint64_t        carps_ipackets6;        /* total input packets, IPv6 */
 107         uint64_t        carps_badif;            /* wrong interface */
 108         uint64_t        carps_badttl;           /* TTL is not CARP_DFLTTL */
 109         uint64_t        carps_hdrops;           /* packets shorter than hdr */
 110         uint64_t        carps_badsum;           /* bad checksum */
 111         uint64_t        carps_badver;           /* bad (incl unsupp) version */
 112         uint64_t        carps_badlen;           /* data length does not match */
 113         uint64_t        carps_badauth;          /* bad authentication */
 114         uint64_t        carps_badvhid;          /* bad VHID */
 115         uint64_t        carps_badaddrs;         /* bad address list */
 116
 117         uint64_t        carps_opackets;         /* total output packets, IPv4 */
 118         uint64_t        carps_opackets6;        /* total output packets, IPv6 */
 119         uint64_t        carps_onomem;           /* no memory for an mbuf */
 120         uint64_t        carps_ostates;          /* total state updates sent */
 121
 122         uint64_t        carps_preempt;          /* if enabled, preemptions */
 123 };
 124
 125 /*
 126  * Configuration structure for SIOCSVH SIOCGVH
 127  */
 128 struct carpreq {
 129         int             carpr_state;
 130 #define CARP_STATES     "INIT", "BACKUP", "MASTER"
 131 #define CARP_MAXSTATE   2
 132         int             carpr_vhid;
 133         int             carpr_advskew;
 134         int             carpr_advbase;
 135         unsigned char   carpr_key[CARP_KEY_LEN];
 136 };
 137 #define SIOCSVH         _IOWR('i', 245, struct ifreq)
 138 #define SIOCGVH         _IOWR('i', 246, struct ifreq)
 139
 140
 141 struct ifcarpvhaddr {
 142         uint32_t                carpa_flags;    /* CARP_VHAF_ */
 143         struct sockaddr_in      carpa_addr;     /* carp address */
 144         struct sockaddr_in      carpa_baddr;    /* backing address */
 145 };
 146 #define CARP_VHAF_OWNER         0x1
 147 #define CARP_VHAF_ONLIST        0x2
 148
 149 #define CARPGDEVNAME            0       /* SIOCGDRVSPEC char[IFNAMSIZ] */
 150 #define CARPGVHADDR             1       /* SIOCGDRVSPEC ifcarpvhaddr array */
 151
 152 /*
 153  * Names for CARP sysctl objects
 154  */
 155 #define CARPCTL_ALLOW           1       /* accept incoming CARP packets */
 156 #define CARPCTL_PREEMPT         2       /* high-pri backup preemption mode */
 157 #define CARPCTL_LOG             3       /* log bad packets */
 158 #define CARPCTL_STATS           4       /* statistics (read-only) */
 159 #define CARPCTL_ARPBALANCE      5       /* balance arp responses */
 160 #define CARPCTL_MAXID           6
 161
 162 #define CARPCTL_NAMES { \
 163         { 0, 0 }, \
 164         { "allow", CTLTYPE_INT }, \
 165         { "preempt", CTLTYPE_INT }, \
 166         { "log", CTLTYPE_INT }, \
 167         { "stats", CTLTYPE_STRUCT }, \
 168         { "arpbalance", CTLTYPE_INT }, \
 169 }
 170
 171 #ifdef _KERNEL
 172 void             carp_carpdev_state(void *);
 173 void             carp_input(struct mbuf *, ...);
 174 int              carp6_input(struct mbuf **, int *, int);
 175 int              carp_output(struct ifnet *, struct mbuf *, struct sockaddr *,
 176                      struct rtentry *);
 177 int              carp_iamatch(const void *, const struct in_addr *,
 178                      const struct in_addr *, uint8_t **);
 179 struct ifaddr   *carp_iamatch6(void *, struct in6_addr *);
 180 void            *carp_macmatch6(void *, struct mbuf *, const struct in6_addr *);
 181 int              carp_forus(const void *, const void *);
 182 #endif /* _KERNEL */
 183
 184 #endif /* _IP_CARP_H */