08b68b0e4c
from scratch, copying needed functionality from the old implemenation on demand, with a thorough review of all code. The main change is that interface layer has been removed from the CARP. Now redundant addresses are configured exactly on the interfaces, they run on. The CARP configuration itself is, as before, configured and read via SIOCSVH/SIOCGVH ioctls. A new prefix created with SIOCAIFADDR or SIOCAIFADDR_IN6 may now be configured to a particular virtual host id, which makes the prefix redundant. ifconfig(8) semantics has been changed too: now one doesn't need to clone carpXX interface, he/she should directly configure a vhid on a Ethernet interface. To supply vhid data from the kernel to an application the getifaddrs(8) function had been changed to pass ifam_data with each address. [1] The new implementation definitely closes all PRs related to carp(4) being an interface, and may close several others. It also allows to run a single redundant IP per interface. Big thanks to Bjoern Zeeb for his help with inet6 part of patch, for idea on using ifam_data and for several rounds of reviewing! PR: kern/117000, kern/126945, kern/126714, kern/120130, kern/117448 Reviewed by: bz Submitted by: bz [1]
197 lines
7.1 KiB
C
197 lines
7.1 KiB
C
/* $FreeBSD$ */
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/* $OpenBSD: ip_carp.h,v 1.8 2004/07/29 22:12:15 mcbride Exp $ */
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/*
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* Copyright (c) 2002 Michael Shalayeff. All rights reserved.
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* Copyright (c) 2003 Ryan McBride. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _IP_CARP_H
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#define _IP_CARP_H
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/*
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* The CARP header layout is as follows:
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Version| Type | VirtualHostID | AdvSkew | Auth Len |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reserved | AdvBase | Checksum |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Counter (1) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Counter (2) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | SHA-1 HMAC (1) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | SHA-1 HMAC (2) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | SHA-1 HMAC (3) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | SHA-1 HMAC (4) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | SHA-1 HMAC (5) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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*/
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struct carp_header {
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#if BYTE_ORDER == LITTLE_ENDIAN
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u_int8_t carp_type:4,
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carp_version:4;
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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u_int8_t carp_version:4,
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carp_type:4;
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#endif
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u_int8_t carp_vhid; /* virtual host id */
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u_int8_t carp_advskew; /* advertisement skew */
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u_int8_t carp_authlen; /* size of counter+md, 32bit chunks */
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u_int8_t carp_pad1; /* reserved */
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u_int8_t carp_advbase; /* advertisement interval */
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u_int16_t carp_cksum;
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u_int32_t carp_counter[2];
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unsigned char carp_md[20]; /* SHA1 HMAC */
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} __packed;
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#ifdef CTASSERT
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CTASSERT(sizeof(struct carp_header) == 36);
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#endif
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#define CARP_DFLTTL 255
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/* carp_version */
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#define CARP_VERSION 2
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/* carp_type */
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#define CARP_ADVERTISEMENT 0x01
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#define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */
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/* carp_advbase */
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#define CARP_DFLTINTV 1
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/*
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* Statistics.
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*/
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struct carpstats {
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uint64_t carps_ipackets; /* total input packets, IPv4 */
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uint64_t carps_ipackets6; /* total input packets, IPv6 */
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uint64_t carps_badif; /* wrong interface */
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uint64_t carps_badttl; /* TTL is not CARP_DFLTTL */
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uint64_t carps_hdrops; /* packets shorter than hdr */
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uint64_t carps_badsum; /* bad checksum */
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uint64_t carps_badver; /* bad (incl unsupp) version */
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uint64_t carps_badlen; /* data length does not match */
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uint64_t carps_badauth; /* bad authentication */
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uint64_t carps_badvhid; /* bad VHID */
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uint64_t carps_badaddrs; /* bad address list */
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uint64_t carps_opackets; /* total output packets, IPv4 */
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uint64_t carps_opackets6; /* total output packets, IPv6 */
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uint64_t carps_onomem; /* no memory for an mbuf */
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uint64_t carps_ostates; /* total state updates sent */
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uint64_t carps_preempt; /* if enabled, preemptions */
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};
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#ifdef _KERNEL
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#define CARPSTATS_ADD(name, val) carpstats.name += (val)
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#define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1)
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#endif
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/*
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* Configuration structure for SIOCSVH SIOCGVH
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*/
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struct carpreq {
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int carpr_count;
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int carpr_vhid;
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#define CARP_MAXVHID 255
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int carpr_state;
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#define CARP_STATES "INIT", "BACKUP", "MASTER"
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#define CARP_MAXSTATE 2
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int carpr_advskew;
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int carpr_advbase;
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unsigned char carpr_key[CARP_KEY_LEN];
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};
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#define SIOCSVH _IOWR('i', 245, struct ifreq)
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#define SIOCGVH _IOWR('i', 246, struct ifreq)
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/*
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* Names for CARP sysctl objects
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*/
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#define CARPCTL_ALLOW 1 /* accept incoming CARP packets */
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#define CARPCTL_PREEMPT 2 /* high-pri backup preemption mode */
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#define CARPCTL_LOG 3 /* log bad packets */
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#define CARPCTL_STATS 4 /* statistics (read-only) */
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#define CARPCTL_MAXID 5
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#define CARPCTL_NAMES { \
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{ 0, 0 }, \
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{ "allow", CTLTYPE_INT }, \
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{ "preempt", CTLTYPE_INT }, \
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{ "log", CTLTYPE_INT }, \
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{ "stats", CTLTYPE_STRUCT }, \
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}
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#ifdef _KERNEL
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int carp_ioctl(struct ifreq *, u_long, struct thread *);
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int carp_attach(struct ifaddr *, int);
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void carp_detach(struct ifaddr *);
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void carp_carpdev_state(struct ifnet *);
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void carp_input (struct mbuf *, int);
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int carp6_input (struct mbuf **, int *, int);
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int carp_output (struct ifnet *, struct mbuf *, struct sockaddr *);
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int carp_iamatch(struct ifaddr *, uint8_t **);
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struct ifaddr *carp_iamatch6(struct ifnet *, struct in6_addr *);
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caddr_t carp_macmatch6(struct ifnet *, struct mbuf *, const struct in6_addr *);
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int carp_forus(struct ifnet *, u_char *);
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/* These are external networking stack hooks for CARP */
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/* net/if.c */
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extern int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *);
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extern int (*carp_attach_p)(struct ifaddr *, int);
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extern void (*carp_detach_p)(struct ifaddr *);
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extern void (*carp_linkstate_p)(struct ifnet *);
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/* net/if_bridge.c net/if_ethersubr.c */
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extern int (*carp_forus_p)(struct ifnet *, u_char *);
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/* net/if_ethersubr.c */
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extern int (*carp_output_p)(struct ifnet *, struct mbuf *,
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struct sockaddr *);
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/* net/rtsock.c */
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extern int (*carp_get_vhid_p)(struct ifaddr *);
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#ifdef INET
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/* netinet/if_ether.c */
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extern int (*carp_iamatch_p)(struct ifaddr *, uint8_t **);
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#endif
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#ifdef INET6
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/* netinet6/nd6_nbr.c */
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extern struct ifaddr *(*carp_iamatch6_p)(struct ifnet *, struct in6_addr *);
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extern caddr_t (*carp_macmatch6_p)(struct ifnet *, struct mbuf *,
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const struct in6_addr *);
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#endif
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#endif
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#endif /* _IP_CARP_H */
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