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/ip_carp.h

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    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 #ifdef _KERNEL
  121 #define CARPSTATS_ADD(name, val)        carpstats.name += (val)
  122 #define CARPSTATS_INC(name)             CARPSTATS_ADD(name, 1)
  123 #endif
  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  * Names for CARP sysctl objects
  142  */
  143 #define CARPCTL_ALLOW           1       /* accept incoming CARP packets */
  144 #define CARPCTL_PREEMPT         2       /* high-pri backup preemption mode */
  145 #define CARPCTL_LOG             3       /* log bad packets */
  146 #define CARPCTL_STATS           4       /* statistics (read-only) */
  147 #define CARPCTL_ARPBALANCE      5       /* balance arp responses */
  148 #define CARPCTL_MAXID           6
  149 
  150 #define CARPCTL_NAMES { \
  151         { 0, 0 }, \
  152         { "allow", CTLTYPE_INT }, \
  153         { "preempt", CTLTYPE_INT }, \
  154         { "log", CTLTYPE_INT }, \
  155         { "stats", CTLTYPE_STRUCT }, \
  156         { "arpbalance", CTLTYPE_INT }, \
  157 }
  158 
  159 #ifdef _KERNEL
  160 void             carp_carpdev_state(struct ifnet *);
  161 void             carp_input (struct mbuf *, int);
  162 int              carp6_input (struct mbuf **, int *, int);
  163 int              carp_output (struct ifnet *, struct mbuf *, struct sockaddr *,
  164                      struct rtentry *);
  165 int              carp_iamatch (struct ifnet *, struct in_ifaddr *, struct in_addr *,
  166                      u_int8_t **);
  167 struct ifaddr   *carp_iamatch6(struct ifnet *, struct in6_addr *);
  168 caddr_t         carp_macmatch6(struct ifnet *, struct mbuf *, const struct in6_addr *);
  169 struct  ifnet   *carp_forus (struct ifnet *, u_char *);
  170 
  171 /* These are external networking stack hooks for CARP */
  172 /* net/if.c */
  173 extern void (*carp_linkstate_p)(struct ifnet *);
  174 /* net/if_bridge.c net/if_ethersubr.c */
  175 extern struct ifnet *(*carp_forus_p)(struct ifnet *, u_char *);
  176 /* net/if_ethersubr.c */
  177 extern int (*carp_output_p)(struct ifnet *, struct mbuf *,
  178     struct sockaddr *, struct rtentry *);
  179 #ifdef INET
  180 /* netinet/if_ether.c */
  181 extern int (*carp_iamatch_p)(struct ifnet *, struct in_ifaddr *,
  182     struct in_addr *, u_int8_t **);
  183 #endif
  184 #ifdef INET6
  185 /* netinet6/nd6_nbr.c */
  186 extern struct ifaddr *(*carp_iamatch6_p)(struct ifnet *, struct in6_addr *);
  187 extern caddr_t (*carp_macmatch6_p)(struct ifnet *, struct mbuf *,
  188     const struct in6_addr *);
  189 #endif
  190 #endif
  191 #endif /* _IP_CARP_H */

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