mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
f08535f872
7.x, 8.x and 9.x with pf(4) imports: pfsync(4) should suppress CARP preemption, while it is running its bulk update. However, reimplement the feature in more elegant manner, that is partially inspired by newer OpenBSD: - Rename term "suppression" to "demotion", to match with OpenBSD. - Keep a global demotion factor, that can be raised by several conditions, for now these are: - interface goes down - carp(4) has problems with ip_output() or ip6_output() - pfsync performs bulk update - Unlike in OpenBSD the demotion factor isn't a counter, but is actual value added to advskew. The adjustment values for particular error conditions are also configurable, and their defaults are maximum advskew value, so a single failure bumps demotion to maximum. This is for POLA compatibility, and should satisfy most users. - Demotion factor is a writable sysctl, so user can do foot shooting, if he desires to.
182 lines
6.8 KiB
C
182 lines
6.8 KiB
C
/* $FreeBSD$ */
|
|
/* $OpenBSD: ip_carp.h,v 1.8 2004/07/29 22:12:15 mcbride Exp $ */
|
|
|
|
/*
|
|
* 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
|
|
|
|
/*
|
|
* 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;
|
|
|
|
#ifdef CTASSERT
|
|
CTASSERT(sizeof(struct carp_header) == 36);
|
|
#endif
|
|
|
|
#define CARP_DFLTTL 255
|
|
|
|
/* carp_version */
|
|
#define CARP_VERSION 2
|
|
|
|
/* carp_type */
|
|
#define CARP_ADVERTISEMENT 0x01
|
|
|
|
#define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */
|
|
|
|
/* carp_advbase */
|
|
#define CARP_DFLTINTV 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 */
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
#define CARPSTATS_ADD(name, val) carpstats.name += (val)
|
|
#define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1)
|
|
#endif
|
|
|
|
/*
|
|
* 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)
|
|
|
|
#ifdef _KERNEL
|
|
int carp_ioctl(struct ifreq *, u_long, struct thread *);
|
|
int carp_attach(struct ifaddr *, int);
|
|
void carp_detach(struct ifaddr *);
|
|
void carp_carpdev_state(struct ifnet *);
|
|
void carp_input (struct mbuf *, int);
|
|
int carp6_input (struct mbuf **, int *, int);
|
|
int carp_output (struct ifnet *, struct mbuf *, struct sockaddr *);
|
|
int carp_iamatch(struct ifaddr *, uint8_t **);
|
|
struct ifaddr *carp_iamatch6(struct ifnet *, struct in6_addr *);
|
|
caddr_t 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 *);
|
|
extern void (*carp_linkstate_p)(struct ifnet *);
|
|
extern void (*carp_demote_adj_p)(int, char *);
|
|
/* 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 *,
|
|
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 caddr_t (*carp_macmatch6_p)(struct ifnet *, struct mbuf *,
|
|
const struct in6_addr *);
|
|
#endif
|
|
#endif
|
|
#endif /* _IP_CARP_H */
|