/* $OpenBSD: ip_carp.h,v 1.8 2004/07/29 22:12:15 mcbride Exp $ */ /*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2002 Michael Shalayeff. All rights reserved. * Copyright (c) 2003 Ryan McBride. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef _IP_CARP_H #define _IP_CARP_H #ifdef _KERNEL /* * The CARP header layout is as follows: * * 0 1 2 3 * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |Version| Type | VirtualHostID | AdvSkew | Auth Len | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Reserved | AdvBase | Checksum | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Counter (1) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Counter (2) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | SHA-1 HMAC (1) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | SHA-1 HMAC (2) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | SHA-1 HMAC (3) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | SHA-1 HMAC (4) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | SHA-1 HMAC (5) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * */ struct carp_header { #if BYTE_ORDER == LITTLE_ENDIAN u_int8_t carp_type:4, carp_version:4; #endif #if BYTE_ORDER == BIG_ENDIAN u_int8_t carp_version:4, carp_type:4; #endif u_int8_t carp_vhid; /* virtual host id */ u_int8_t carp_advskew; /* advertisement skew */ u_int8_t carp_authlen; /* size of counter+md, 32bit chunks */ u_int8_t carp_pad1; /* reserved */ u_int8_t carp_advbase; /* advertisement interval */ u_int16_t carp_cksum; u_int32_t carp_counter[2]; unsigned char carp_md[20]; /* SHA1 HMAC */ } __packed; CTASSERT(sizeof(struct carp_header) == 36); /* * The VRRPv3 header layout is as follows: * See RFC9568, 5.1. VRRP Packet Format * * 0 1 2 3 * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |Version| Type | Virtual Rtr ID| Priority |Count IPvX Addr| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |(rsvd) | Max Adver Int | Checksum | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | | * + + * | IPvX Address(es) | * + + * + + * + + * + + * | | * + + * | | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * */ struct vrrpv3_header { #if BYTE_ORDER == LITTLE_ENDIAN uint8_t vrrp_type:4, vrrp_version:4; #endif #if BYTE_ORDER == BIG_ENDIAN uint8_t vrrp_version:4, vrrp_type:4; #endif uint8_t vrrp_vrtid; uint8_t vrrp_priority; uint8_t vrrp_count_addr; uint16_t vrrp_max_adver_int; uint16_t vrrp_checksum; } __packed; CTASSERT(sizeof(struct vrrpv3_header) == 8); #endif /* _KERNEL */ #define CARP_DFLTTL 255 /* carp_type */ #define CARP_ADVERTISEMENT 0x01 #define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */ /* carp_advbase */ #define CARP_DFLTINTV 1 #define VRRP_TYPE_ADVERTISEMENT 0x01 #define VRRP_MAX_INTERVAL (0x1000 - 1) /* * Statistics. */ struct carpstats { uint64_t carps_ipackets; /* total input packets, IPv4 */ uint64_t carps_ipackets6; /* total input packets, IPv6 */ uint64_t carps_badif; /* wrong interface */ uint64_t carps_badttl; /* TTL is not CARP_DFLTTL */ uint64_t carps_hdrops; /* packets shorter than hdr */ uint64_t carps_badsum; /* bad checksum */ uint64_t carps_badver; /* bad (incl unsupp) version */ uint64_t carps_badlen; /* data length does not match */ uint64_t carps_badauth; /* bad authentication */ uint64_t carps_badvhid; /* bad VHID */ uint64_t carps_badaddrs; /* bad address list */ uint64_t carps_opackets; /* total output packets, IPv4 */ uint64_t carps_opackets6; /* total output packets, IPv6 */ uint64_t carps_onomem; /* no memory for an mbuf */ uint64_t carps_ostates; /* total state updates sent */ uint64_t carps_preempt; /* if enabled, preemptions */ }; #define CARP_MAXVHID 255 #define CARP_STATES "INIT", "BACKUP", "MASTER" #define CARP_MAXSTATE 2 #define CARP_MAXSKEW 240 typedef enum carp_version { CARP_VERSION_CARP = 2, CARP_VERSION_VRRPv3 = 3, } carp_version_t; #ifdef _KERNEL int carp_attach(struct ifaddr *, int); void carp_detach(struct ifaddr *, bool); void carp_carpdev_state(struct ifnet *); int carp_output (struct ifnet *, struct mbuf *, const struct sockaddr *); int carp_master(struct ifaddr *); int carp_iamatch(struct ifaddr *, uint8_t **); struct ifaddr *carp_iamatch6(struct ifnet *, struct in6_addr *); char * carp_macmatch6(struct ifnet *, struct mbuf *, const struct in6_addr *); int carp_forus(struct ifnet *, u_char *); /* These are external networking stack hooks for CARP */ /* net/if.c */ extern int (*carp_attach_p)(struct ifaddr *, int); extern void (*carp_detach_p)(struct ifaddr *, bool); extern void (*carp_linkstate_p)(struct ifnet *); extern void (*carp_demote_adj_p)(int, char *); extern int (*carp_master_p)(struct ifaddr *); /* net/if_bridge.c net/if_ethersubr.c */ extern int (*carp_forus_p)(struct ifnet *, u_char *); /* net/if_ethersubr.c */ extern int (*carp_output_p)(struct ifnet *, struct mbuf *, const struct sockaddr *); /* net/rtsock.c */ extern int (*carp_get_vhid_p)(struct ifaddr *); #ifdef INET /* netinet/if_ether.c */ extern int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); #endif #ifdef INET6 /* netinet6/nd6_nbr.c */ extern struct ifaddr *(*carp_iamatch6_p)(struct ifnet *, struct in6_addr *); extern char * (*carp_macmatch6_p)(struct ifnet *, struct mbuf *, const struct in6_addr *); #endif #endif #endif /* _IP_CARP_H */
