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freebsd/sys/netinet/ip_carp.h
Kristof Provost 3711515467 carp: support VRRPv3 
Allow carp(4) to use the VRRPv3 protocol (RFC 5798). We can distinguish carp and
VRRP based on the protocol version number (carp is 2, VRRPv3 is 3), and support
both from the carp(4) code.

Reviewed by:	glebius
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D44774
2024-05-08 13:19:03 +02:00

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/* $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 */
};
/*
* Configuration structure for SIOCSVH SIOCGVH
*/
struct carpreq {
int carpr_count;
int carpr_vhid;
#define CARP_MAXVHID 255
int carpr_state;
#define CARP_STATES "INIT", "BACKUP", "MASTER"
#define CARP_MAXSTATE 2
int carpr_advskew;
#define CARP_MAXSKEW 240
int carpr_advbase;
unsigned char carpr_key[CARP_KEY_LEN];
};
#define SIOCSVH _IOWR('i', 245, struct ifreq)
#define SIOCGVH _IOWR('i', 246, struct ifreq)
typedef enum carp_version {
CARP_VERSION_CARP = 2,
CARP_VERSION_VRRPv3 = 3,
} carp_version_t;
#ifdef _KERNEL
int carp_ioctl(struct ifreq *, u_long, struct thread *);
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_ioctl_p)(struct ifreq *, u_long, struct thread *);
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 */
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