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: releng/10.1/sys/netinet/ip_carp.h 253087 2013-07-09 10:02:51Z ae $    */
    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_count;
  125         int             carpr_vhid;
  126 #define CARP_MAXVHID    255
  127         int             carpr_state;
  128 #define CARP_STATES     "INIT", "BACKUP", "MASTER"
  129 #define CARP_MAXSTATE   2
  130         int             carpr_advskew;
  131 #define CARP_MAXSKEW    240
  132         int             carpr_advbase;
  133         unsigned char   carpr_key[CARP_KEY_LEN];
  134 };
  135 #define SIOCSVH _IOWR('i', 245, struct ifreq)
  136 #define SIOCGVH _IOWR('i', 246, struct ifreq)
  137 
  138 #ifdef _KERNEL
  139 int             carp_ioctl(struct ifreq *, u_long, struct thread *);
  140 int             carp_attach(struct ifaddr *, int);
  141 void            carp_detach(struct ifaddr *);
  142 void            carp_carpdev_state(struct ifnet *);
  143 void            carp_input (struct mbuf *, int);
  144 int             carp6_input (struct mbuf **, int *, int);
  145 int             carp_output (struct ifnet *, struct mbuf *,
  146                     const struct sockaddr *);
  147 int             carp_master(struct ifaddr *);
  148 int             carp_iamatch(struct ifaddr *, uint8_t **);
  149 struct ifaddr   *carp_iamatch6(struct ifnet *, struct in6_addr *);
  150 caddr_t         carp_macmatch6(struct ifnet *, struct mbuf *, const struct in6_addr *);
  151 int             carp_forus(struct ifnet *, u_char *);
  152 
  153 /* These are external networking stack hooks for CARP */
  154 /* net/if.c */
  155 extern int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *);
  156 extern int (*carp_attach_p)(struct ifaddr *, int);
  157 extern void (*carp_detach_p)(struct ifaddr *);
  158 extern void (*carp_linkstate_p)(struct ifnet *);
  159 extern void (*carp_demote_adj_p)(int, char *);
  160 extern int (*carp_master_p)(struct ifaddr *);
  161 /* net/if_bridge.c net/if_ethersubr.c */
  162 extern int (*carp_forus_p)(struct ifnet *, u_char *);
  163 /* net/if_ethersubr.c */
  164 extern int (*carp_output_p)(struct ifnet *, struct mbuf *,
  165     const struct sockaddr *);
  166 /* net/rtsock.c */
  167 extern int (*carp_get_vhid_p)(struct ifaddr *);
  168 #ifdef INET
  169 /* netinet/if_ether.c */
  170 extern int (*carp_iamatch_p)(struct ifaddr *, uint8_t **);
  171 #endif
  172 #ifdef INET6
  173 /* netinet6/nd6_nbr.c */
  174 extern struct ifaddr *(*carp_iamatch6_p)(struct ifnet *, struct in6_addr *);
  175 extern caddr_t (*carp_macmatch6_p)(struct ifnet *, struct mbuf *,
  176     const struct in6_addr *);
  177 #endif
  178 #endif
  179 #endif /* _IP_CARP_H */

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