2202 lines
50 KiB
C
2202 lines
50 KiB
C
/*-
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* Copyright (c) 2002 Michael Shalayeff.
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* Copyright (c) 2003 Ryan McBride.
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* Copyright (c) 2011 Gleb Smirnoff <glebius@FreeBSD.org>
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* 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_bpf.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/taskqueue.h>
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#include <sys/counter.h>
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#include <net/ethernet.h>
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#include <net/fddi.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_llatbl.h>
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#include <net/if_types.h>
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#include <net/iso88025.h>
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#include <net/route.h>
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#include <net/vnet.h>
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#if defined(INET) || defined(INET6)
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_carp.h>
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#include <netinet/ip.h>
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#include <machine/in_cksum.h>
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#endif
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#ifdef INET
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#include <netinet/ip_var.h>
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#include <netinet/if_ether.h>
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#endif
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#ifdef INET6
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#include <netinet/icmp6.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6protosw.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/scope6_var.h>
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#include <netinet6/nd6.h>
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#endif
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#include <crypto/sha1.h>
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static MALLOC_DEFINE(M_CARP, "CARP", "CARP addresses");
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struct carp_softc {
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struct ifnet *sc_carpdev; /* Pointer to parent ifnet. */
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struct ifaddr **sc_ifas; /* Our ifaddrs. */
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struct sockaddr_dl sc_addr; /* Our link level address. */
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struct callout sc_ad_tmo; /* Advertising timeout. */
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#ifdef INET
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struct callout sc_md_tmo; /* Master down timeout. */
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#endif
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#ifdef INET6
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struct callout sc_md6_tmo; /* XXX: Master down timeout. */
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#endif
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struct mtx sc_mtx;
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int sc_vhid;
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int sc_advskew;
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int sc_advbase;
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int sc_naddrs;
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int sc_naddrs6;
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int sc_ifasiz;
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enum { INIT = 0, BACKUP, MASTER } sc_state;
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int sc_suppress;
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int sc_sendad_errors;
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#define CARP_SENDAD_MAX_ERRORS 3
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int sc_sendad_success;
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#define CARP_SENDAD_MIN_SUCCESS 3
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int sc_init_counter;
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uint64_t sc_counter;
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/* authentication */
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#define CARP_HMAC_PAD 64
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unsigned char sc_key[CARP_KEY_LEN];
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unsigned char sc_pad[CARP_HMAC_PAD];
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SHA1_CTX sc_sha1;
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TAILQ_ENTRY(carp_softc) sc_list; /* On the carp_if list. */
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LIST_ENTRY(carp_softc) sc_next; /* On the global list. */
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};
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struct carp_if {
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#ifdef INET
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int cif_naddrs;
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#endif
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#ifdef INET6
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int cif_naddrs6;
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#endif
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TAILQ_HEAD(, carp_softc) cif_vrs;
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#ifdef INET
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struct ip_moptions cif_imo;
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#endif
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#ifdef INET6
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struct ip6_moptions cif_im6o;
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#endif
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struct ifnet *cif_ifp;
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struct mtx cif_mtx;
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};
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#define CARP_INET 0
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#define CARP_INET6 1
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static int proto_reg[] = {-1, -1};
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/*
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* Brief design of carp(4).
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*
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* Any carp-capable ifnet may have a list of carp softcs hanging off
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* its ifp->if_carp pointer. Each softc represents one unique virtual
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* host id, or vhid. The softc has a back pointer to the ifnet. All
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* softcs are joined in a global list, which has quite limited use.
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*
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* Any interface address that takes part in CARP negotiation has a
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* pointer to the softc of its vhid, ifa->ifa_carp. That could be either
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* AF_INET or AF_INET6 address.
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*
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* Although, one can get the softc's backpointer to ifnet and traverse
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* through its ifp->if_addrhead queue to find all interface addresses
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* involved in CARP, we keep a growable array of ifaddr pointers. This
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* allows us to avoid grabbing the IF_ADDR_LOCK() in many traversals that
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* do calls into the network stack, thus avoiding LORs.
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*
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* Locking:
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*
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* Each softc has a lock sc_mtx. It is used to synchronise carp_input_c(),
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* callout-driven events and ioctl()s.
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*
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* To traverse the list of softcs on an ifnet we use CIF_LOCK(), to
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* traverse the global list we use the mutex carp_mtx.
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*
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* Known issues with locking:
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*
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* - There is no protection for races between two ioctl() requests,
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* neither SIOCSVH, nor SIOCAIFADDR & SIOCAIFADDR_IN6. I think that all
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* interface ioctl()s should be serialized right in net/if.c.
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* - Sending ad, we put the pointer to the softc in an mtag, and no reference
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* counting is done on the softc.
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* - On module unload we may race (?) with packet processing thread
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* dereferencing our function pointers.
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*/
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/* Accept incoming CARP packets. */
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static VNET_DEFINE(int, carp_allow) = 1;
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#define V_carp_allow VNET(carp_allow)
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/* Preempt slower nodes. */
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static VNET_DEFINE(int, carp_preempt) = 0;
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#define V_carp_preempt VNET(carp_preempt)
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/* Log level. */
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static VNET_DEFINE(int, carp_log) = 1;
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#define V_carp_log VNET(carp_log)
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/* Global advskew demotion. */
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static VNET_DEFINE(int, carp_demotion) = 0;
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#define V_carp_demotion VNET(carp_demotion)
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/* Send error demotion factor. */
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static VNET_DEFINE(int, carp_senderr_adj) = CARP_MAXSKEW;
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#define V_carp_senderr_adj VNET(carp_senderr_adj)
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/* Iface down demotion factor. */
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static VNET_DEFINE(int, carp_ifdown_adj) = CARP_MAXSKEW;
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#define V_carp_ifdown_adj VNET(carp_ifdown_adj)
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static int carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS);
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SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP");
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SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, allow, CTLFLAG_RW,
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&VNET_NAME(carp_allow), 0, "Accept incoming CARP packets");
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SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, preempt, CTLFLAG_RW,
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&VNET_NAME(carp_preempt), 0, "High-priority backup preemption mode");
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SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, log, CTLFLAG_RW,
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&VNET_NAME(carp_log), 0, "CARP log level");
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SYSCTL_VNET_PROC(_net_inet_carp, OID_AUTO, demotion, CTLTYPE_INT|CTLFLAG_RW,
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0, 0, carp_demote_adj_sysctl, "I",
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"Adjust demotion factor (skew of advskew)");
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SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, senderr_demotion_factor, CTLFLAG_RW,
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&VNET_NAME(carp_senderr_adj), 0, "Send error demotion factor adjustment");
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SYSCTL_VNET_INT(_net_inet_carp, OID_AUTO, ifdown_demotion_factor, CTLFLAG_RW,
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&VNET_NAME(carp_ifdown_adj), 0,
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"Interface down demotion factor adjustment");
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VNET_PCPUSTAT_DEFINE(struct carpstats, carpstats);
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VNET_PCPUSTAT_SYSINIT(carpstats);
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VNET_PCPUSTAT_SYSUNINIT(carpstats);
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#define CARPSTATS_ADD(name, val) \
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counter_u64_add(VNET(carpstats)[offsetof(struct carpstats, name) / \
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sizeof(uint64_t)], (val))
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#define CARPSTATS_INC(name) CARPSTATS_ADD(name, 1)
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SYSCTL_VNET_PCPUSTAT(_net_inet_carp, OID_AUTO, stats, struct carpstats,
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carpstats, "CARP statistics (struct carpstats, netinet/ip_carp.h)");
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#define CARP_LOCK_INIT(sc) mtx_init(&(sc)->sc_mtx, "carp_softc", \
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NULL, MTX_DEF)
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#define CARP_LOCK_DESTROY(sc) mtx_destroy(&(sc)->sc_mtx)
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#define CARP_LOCK_ASSERT(sc) mtx_assert(&(sc)->sc_mtx, MA_OWNED)
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#define CARP_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
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#define CARP_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
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#define CIF_LOCK_INIT(cif) mtx_init(&(cif)->cif_mtx, "carp_if", \
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NULL, MTX_DEF)
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#define CIF_LOCK_DESTROY(cif) mtx_destroy(&(cif)->cif_mtx)
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#define CIF_LOCK_ASSERT(cif) mtx_assert(&(cif)->cif_mtx, MA_OWNED)
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#define CIF_LOCK(cif) mtx_lock(&(cif)->cif_mtx)
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#define CIF_UNLOCK(cif) mtx_unlock(&(cif)->cif_mtx)
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#define CIF_FREE(cif) do { \
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CIF_LOCK_ASSERT(cif); \
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if (TAILQ_EMPTY(&(cif)->cif_vrs)) \
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carp_free_if(cif); \
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else \
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CIF_UNLOCK(cif); \
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} while (0)
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#define CARP_LOG(...) do { \
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if (V_carp_log > 0) \
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log(LOG_INFO, "carp: " __VA_ARGS__); \
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} while (0)
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#define CARP_DEBUG(...) do { \
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if (V_carp_log > 1) \
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log(LOG_DEBUG, __VA_ARGS__); \
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} while (0)
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#define IFNET_FOREACH_IFA(ifp, ifa) \
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IF_ADDR_LOCK_ASSERT(ifp); \
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TAILQ_FOREACH((ifa), &(ifp)->if_addrhead, ifa_link) \
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if ((ifa)->ifa_carp != NULL)
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#define CARP_FOREACH_IFA(sc, ifa) \
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CARP_LOCK_ASSERT(sc); \
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for (int _i = 0; \
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_i < (sc)->sc_naddrs + (sc)->sc_naddrs6 && \
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((ifa) = sc->sc_ifas[_i]) != NULL; \
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++_i)
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#define IFNET_FOREACH_CARP(ifp, sc) \
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CIF_LOCK_ASSERT(ifp->if_carp); \
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TAILQ_FOREACH((sc), &(ifp)->if_carp->cif_vrs, sc_list)
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#define DEMOTE_ADVSKEW(sc) \
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(((sc)->sc_advskew + V_carp_demotion > CARP_MAXSKEW) ? \
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CARP_MAXSKEW : ((sc)->sc_advskew + V_carp_demotion))
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static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
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static struct carp_softc
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*carp_alloc(struct ifnet *);
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static void carp_detach_locked(struct ifaddr *);
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static void carp_destroy(struct carp_softc *);
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static struct carp_if
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*carp_alloc_if(struct ifnet *);
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static void carp_free_if(struct carp_if *);
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static void carp_set_state(struct carp_softc *, int);
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static void carp_sc_state(struct carp_softc *);
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static void carp_setrun(struct carp_softc *, sa_family_t);
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static void carp_master_down(void *);
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static void carp_master_down_locked(struct carp_softc *);
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static void carp_send_ad(void *);
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static void carp_send_ad_locked(struct carp_softc *);
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static void carp_addroute(struct carp_softc *);
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static void carp_ifa_addroute(struct ifaddr *);
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static void carp_delroute(struct carp_softc *);
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static void carp_ifa_delroute(struct ifaddr *);
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static void carp_send_ad_all(void *, int);
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static void carp_demote_adj(int, char *);
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static LIST_HEAD(, carp_softc) carp_list;
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static struct mtx carp_mtx;
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static struct task carp_sendall_task =
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TASK_INITIALIZER(0, carp_send_ad_all, NULL);
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static void
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carp_hmac_prepare(struct carp_softc *sc)
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{
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uint8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
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uint8_t vhid = sc->sc_vhid & 0xff;
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struct ifaddr *ifa;
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int i, found;
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#ifdef INET
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struct in_addr last, cur, in;
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#endif
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#ifdef INET6
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struct in6_addr last6, cur6, in6;
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#endif
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CARP_LOCK_ASSERT(sc);
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/* Compute ipad from key. */
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bzero(sc->sc_pad, sizeof(sc->sc_pad));
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bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
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for (i = 0; i < sizeof(sc->sc_pad); i++)
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sc->sc_pad[i] ^= 0x36;
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/* Precompute first part of inner hash. */
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SHA1Init(&sc->sc_sha1);
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SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
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SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
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SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
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SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
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#ifdef INET
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cur.s_addr = 0;
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do {
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found = 0;
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last = cur;
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cur.s_addr = 0xffffffff;
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CARP_FOREACH_IFA(sc, ifa) {
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in.s_addr = ifatoia(ifa)->ia_addr.sin_addr.s_addr;
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if (ifa->ifa_addr->sa_family == AF_INET &&
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ntohl(in.s_addr) > ntohl(last.s_addr) &&
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ntohl(in.s_addr) < ntohl(cur.s_addr)) {
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cur.s_addr = in.s_addr;
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found++;
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}
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}
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if (found)
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SHA1Update(&sc->sc_sha1, (void *)&cur, sizeof(cur));
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} while (found);
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#endif /* INET */
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#ifdef INET6
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memset(&cur6, 0, sizeof(cur6));
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do {
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found = 0;
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last6 = cur6;
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memset(&cur6, 0xff, sizeof(cur6));
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CARP_FOREACH_IFA(sc, ifa) {
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in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
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if (IN6_IS_SCOPE_EMBED(&in6))
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in6.s6_addr16[1] = 0;
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if (ifa->ifa_addr->sa_family == AF_INET6 &&
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memcmp(&in6, &last6, sizeof(in6)) > 0 &&
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memcmp(&in6, &cur6, sizeof(in6)) < 0) {
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cur6 = in6;
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found++;
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}
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}
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if (found)
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SHA1Update(&sc->sc_sha1, (void *)&cur6, sizeof(cur6));
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} while (found);
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#endif /* INET6 */
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/* convert ipad to opad */
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for (i = 0; i < sizeof(sc->sc_pad); i++)
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sc->sc_pad[i] ^= 0x36 ^ 0x5c;
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}
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static void
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carp_hmac_generate(struct carp_softc *sc, uint32_t counter[2],
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unsigned char md[20])
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{
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SHA1_CTX sha1ctx;
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CARP_LOCK_ASSERT(sc);
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/* fetch first half of inner hash */
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bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
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SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
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SHA1Final(md, &sha1ctx);
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/* outer hash */
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SHA1Init(&sha1ctx);
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SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
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SHA1Update(&sha1ctx, md, 20);
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SHA1Final(md, &sha1ctx);
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}
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static int
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carp_hmac_verify(struct carp_softc *sc, uint32_t counter[2],
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unsigned char md[20])
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{
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unsigned char md2[20];
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CARP_LOCK_ASSERT(sc);
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carp_hmac_generate(sc, counter, md2);
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return (bcmp(md, md2, sizeof(md2)));
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}
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/*
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* process input packet.
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* we have rearranged checks order compared to the rfc,
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* but it seems more efficient this way or not possible otherwise.
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*/
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#ifdef INET
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void
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carp_input(struct mbuf *m, int hlen)
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{
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struct ip *ip = mtod(m, struct ip *);
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struct carp_header *ch;
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int iplen, len;
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CARPSTATS_INC(carps_ipackets);
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if (!V_carp_allow) {
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m_freem(m);
|
|
return;
|
|
}
|
|
|
|
/* verify that the IP TTL is 255. */
|
|
if (ip->ip_ttl != CARP_DFLTTL) {
|
|
CARPSTATS_INC(carps_badttl);
|
|
CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__,
|
|
ip->ip_ttl,
|
|
m->m_pkthdr.rcvif->if_xname);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
iplen = ip->ip_hl << 2;
|
|
|
|
if (m->m_pkthdr.len < iplen + sizeof(*ch)) {
|
|
CARPSTATS_INC(carps_badlen);
|
|
CARP_DEBUG("%s: received len %zd < sizeof(struct carp_header) "
|
|
"on %s\n", __func__, m->m_len - sizeof(struct ip),
|
|
m->m_pkthdr.rcvif->if_xname);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
if (iplen + sizeof(*ch) < m->m_len) {
|
|
if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
|
|
CARPSTATS_INC(carps_hdrops);
|
|
CARP_DEBUG("%s: pullup failed\n", __func__);
|
|
return;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
}
|
|
ch = (struct carp_header *)((char *)ip + iplen);
|
|
|
|
/*
|
|
* verify that the received packet length is
|
|
* equal to the CARP header
|
|
*/
|
|
len = iplen + sizeof(*ch);
|
|
if (len > m->m_pkthdr.len) {
|
|
CARPSTATS_INC(carps_badlen);
|
|
CARP_DEBUG("%s: packet too short %d on %s\n", __func__,
|
|
m->m_pkthdr.len,
|
|
m->m_pkthdr.rcvif->if_xname);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
if ((m = m_pullup(m, len)) == NULL) {
|
|
CARPSTATS_INC(carps_hdrops);
|
|
return;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
ch = (struct carp_header *)((char *)ip + iplen);
|
|
|
|
/* verify the CARP checksum */
|
|
m->m_data += iplen;
|
|
if (in_cksum(m, len - iplen)) {
|
|
CARPSTATS_INC(carps_badsum);
|
|
CARP_DEBUG("%s: checksum failed on %s\n", __func__,
|
|
m->m_pkthdr.rcvif->if_xname);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
m->m_data -= iplen;
|
|
|
|
carp_input_c(m, ch, AF_INET);
|
|
}
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
int
|
|
carp6_input(struct mbuf **mp, int *offp, int proto)
|
|
{
|
|
struct mbuf *m = *mp;
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
struct carp_header *ch;
|
|
u_int len;
|
|
|
|
CARPSTATS_INC(carps_ipackets6);
|
|
|
|
if (!V_carp_allow) {
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
/* check if received on a valid carp interface */
|
|
if (m->m_pkthdr.rcvif->if_carp == NULL) {
|
|
CARPSTATS_INC(carps_badif);
|
|
CARP_DEBUG("%s: packet received on non-carp interface: %s\n",
|
|
__func__, m->m_pkthdr.rcvif->if_xname);
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
/* verify that the IP TTL is 255 */
|
|
if (ip6->ip6_hlim != CARP_DFLTTL) {
|
|
CARPSTATS_INC(carps_badttl);
|
|
CARP_DEBUG("%s: received ttl %d != 255 on %s\n", __func__,
|
|
ip6->ip6_hlim, m->m_pkthdr.rcvif->if_xname);
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
/* verify that we have a complete carp packet */
|
|
len = m->m_len;
|
|
IP6_EXTHDR_GET(ch, struct carp_header *, m, *offp, sizeof(*ch));
|
|
if (ch == NULL) {
|
|
CARPSTATS_INC(carps_badlen);
|
|
CARP_DEBUG("%s: packet size %u too small\n", __func__, len);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
|
|
/* verify the CARP checksum */
|
|
m->m_data += *offp;
|
|
if (in_cksum(m, sizeof(*ch))) {
|
|
CARPSTATS_INC(carps_badsum);
|
|
CARP_DEBUG("%s: checksum failed, on %s\n", __func__,
|
|
m->m_pkthdr.rcvif->if_xname);
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
m->m_data -= *offp;
|
|
|
|
carp_input_c(m, ch, AF_INET6);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
static void
|
|
carp_input_c(struct mbuf *m, struct carp_header *ch, sa_family_t af)
|
|
{
|
|
struct ifnet *ifp = m->m_pkthdr.rcvif;
|
|
struct ifaddr *ifa;
|
|
struct carp_softc *sc;
|
|
uint64_t tmp_counter;
|
|
struct timeval sc_tv, ch_tv;
|
|
|
|
/* verify that the VHID is valid on the receiving interface */
|
|
IF_ADDR_RLOCK(ifp);
|
|
IFNET_FOREACH_IFA(ifp, ifa)
|
|
if (ifa->ifa_addr->sa_family == af &&
|
|
ifa->ifa_carp->sc_vhid == ch->carp_vhid) {
|
|
ifa_ref(ifa);
|
|
break;
|
|
}
|
|
IF_ADDR_RUNLOCK(ifp);
|
|
|
|
if (ifa == NULL) {
|
|
CARPSTATS_INC(carps_badvhid);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
/* verify the CARP version. */
|
|
if (ch->carp_version != CARP_VERSION) {
|
|
CARPSTATS_INC(carps_badver);
|
|
CARP_DEBUG("%s: invalid version %d\n", ifp->if_xname,
|
|
ch->carp_version);
|
|
ifa_free(ifa);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
sc = ifa->ifa_carp;
|
|
CARP_LOCK(sc);
|
|
ifa_free(ifa);
|
|
|
|
if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
|
|
CARPSTATS_INC(carps_badauth);
|
|
CARP_DEBUG("%s: incorrect hash for VHID %u@%s\n", __func__,
|
|
sc->sc_vhid, ifp->if_xname);
|
|
goto out;
|
|
}
|
|
|
|
tmp_counter = ntohl(ch->carp_counter[0]);
|
|
tmp_counter = tmp_counter<<32;
|
|
tmp_counter += ntohl(ch->carp_counter[1]);
|
|
|
|
/* XXX Replay protection goes here */
|
|
|
|
sc->sc_init_counter = 0;
|
|
sc->sc_counter = tmp_counter;
|
|
|
|
sc_tv.tv_sec = sc->sc_advbase;
|
|
sc_tv.tv_usec = DEMOTE_ADVSKEW(sc) * 1000000 / 256;
|
|
ch_tv.tv_sec = ch->carp_advbase;
|
|
ch_tv.tv_usec = ch->carp_advskew * 1000000 / 256;
|
|
|
|
switch (sc->sc_state) {
|
|
case INIT:
|
|
break;
|
|
case MASTER:
|
|
/*
|
|
* If we receive an advertisement from a master who's going to
|
|
* be more frequent than us, go into BACKUP state.
|
|
*/
|
|
if (timevalcmp(&sc_tv, &ch_tv, >) ||
|
|
timevalcmp(&sc_tv, &ch_tv, ==)) {
|
|
callout_stop(&sc->sc_ad_tmo);
|
|
CARP_LOG("VHID %u@%s: MASTER -> BACKUP "
|
|
"(more frequent advertisement received)\n",
|
|
sc->sc_vhid,
|
|
sc->sc_carpdev->if_xname);
|
|
carp_set_state(sc, BACKUP);
|
|
carp_setrun(sc, 0);
|
|
carp_delroute(sc);
|
|
}
|
|
break;
|
|
case BACKUP:
|
|
/*
|
|
* If we're pre-empting masters who advertise slower than us,
|
|
* and this one claims to be slower, treat him as down.
|
|
*/
|
|
if (V_carp_preempt && timevalcmp(&sc_tv, &ch_tv, <)) {
|
|
CARP_LOG("VHID %u@%s: BACKUP -> MASTER "
|
|
"(preempting a slower master)\n",
|
|
sc->sc_vhid,
|
|
sc->sc_carpdev->if_xname);
|
|
carp_master_down_locked(sc);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If the master is going to advertise at such a low frequency
|
|
* that he's guaranteed to time out, we'd might as well just
|
|
* treat him as timed out now.
|
|
*/
|
|
sc_tv.tv_sec = sc->sc_advbase * 3;
|
|
if (timevalcmp(&sc_tv, &ch_tv, <)) {
|
|
CARP_LOG("VHID %u@%s: BACKUP -> MASTER "
|
|
"(master timed out)\n",
|
|
sc->sc_vhid,
|
|
sc->sc_carpdev->if_xname);
|
|
carp_master_down_locked(sc);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Otherwise, we reset the counter and wait for the next
|
|
* advertisement.
|
|
*/
|
|
carp_setrun(sc, af);
|
|
break;
|
|
}
|
|
|
|
out:
|
|
CARP_UNLOCK(sc);
|
|
m_freem(m);
|
|
}
|
|
|
|
static int
|
|
carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
|
|
{
|
|
struct m_tag *mtag;
|
|
|
|
if (sc->sc_init_counter) {
|
|
/* this could also be seconds since unix epoch */
|
|
sc->sc_counter = arc4random();
|
|
sc->sc_counter = sc->sc_counter << 32;
|
|
sc->sc_counter += arc4random();
|
|
} else
|
|
sc->sc_counter++;
|
|
|
|
ch->carp_counter[0] = htonl((sc->sc_counter>>32)&0xffffffff);
|
|
ch->carp_counter[1] = htonl(sc->sc_counter&0xffffffff);
|
|
|
|
carp_hmac_generate(sc, ch->carp_counter, ch->carp_md);
|
|
|
|
/* Tag packet for carp_output */
|
|
if ((mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct carp_softc *),
|
|
M_NOWAIT)) == NULL) {
|
|
m_freem(m);
|
|
CARPSTATS_INC(carps_onomem);
|
|
return (ENOMEM);
|
|
}
|
|
bcopy(&sc, mtag + 1, sizeof(sc));
|
|
m_tag_prepend(m, mtag);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* To avoid LORs and possible recursions this function shouldn't
|
|
* be called directly, but scheduled via taskqueue.
|
|
*/
|
|
static void
|
|
carp_send_ad_all(void *ctx __unused, int pending __unused)
|
|
{
|
|
struct carp_softc *sc;
|
|
|
|
mtx_lock(&carp_mtx);
|
|
LIST_FOREACH(sc, &carp_list, sc_next)
|
|
if (sc->sc_state == MASTER) {
|
|
CARP_LOCK(sc);
|
|
CURVNET_SET(sc->sc_carpdev->if_vnet);
|
|
carp_send_ad_locked(sc);
|
|
CURVNET_RESTORE();
|
|
CARP_UNLOCK(sc);
|
|
}
|
|
mtx_unlock(&carp_mtx);
|
|
}
|
|
|
|
/* Send a periodic advertisement, executed in callout context. */
|
|
static void
|
|
carp_send_ad(void *v)
|
|
{
|
|
struct carp_softc *sc = v;
|
|
|
|
CARP_LOCK_ASSERT(sc);
|
|
CURVNET_SET(sc->sc_carpdev->if_vnet);
|
|
carp_send_ad_locked(sc);
|
|
CURVNET_RESTORE();
|
|
CARP_UNLOCK(sc);
|
|
}
|
|
|
|
static void
|
|
carp_send_ad_locked(struct carp_softc *sc)
|
|
{
|
|
struct carp_header ch;
|
|
struct timeval tv;
|
|
struct sockaddr sa;
|
|
struct ifaddr *ifa;
|
|
struct carp_header *ch_ptr;
|
|
struct mbuf *m;
|
|
int len, advskew;
|
|
|
|
CARP_LOCK_ASSERT(sc);
|
|
|
|
advskew = DEMOTE_ADVSKEW(sc);
|
|
tv.tv_sec = sc->sc_advbase;
|
|
tv.tv_usec = advskew * 1000000 / 256;
|
|
|
|
ch.carp_version = CARP_VERSION;
|
|
ch.carp_type = CARP_ADVERTISEMENT;
|
|
ch.carp_vhid = sc->sc_vhid;
|
|
ch.carp_advbase = sc->sc_advbase;
|
|
ch.carp_advskew = advskew;
|
|
ch.carp_authlen = 7; /* XXX DEFINE */
|
|
ch.carp_pad1 = 0; /* must be zero */
|
|
ch.carp_cksum = 0;
|
|
|
|
/* XXXGL: OpenBSD picks first ifaddr with needed family. */
|
|
|
|
#ifdef INET
|
|
if (sc->sc_naddrs) {
|
|
struct ip *ip;
|
|
|
|
m = m_gethdr(M_NOWAIT, MT_DATA);
|
|
if (m == NULL) {
|
|
CARPSTATS_INC(carps_onomem);
|
|
goto resched;
|
|
}
|
|
len = sizeof(*ip) + sizeof(ch);
|
|
m->m_pkthdr.len = len;
|
|
m->m_pkthdr.rcvif = NULL;
|
|
m->m_len = len;
|
|
MH_ALIGN(m, m->m_len);
|
|
m->m_flags |= M_MCAST;
|
|
ip = mtod(m, struct ip *);
|
|
ip->ip_v = IPVERSION;
|
|
ip->ip_hl = sizeof(*ip) >> 2;
|
|
ip->ip_tos = IPTOS_LOWDELAY;
|
|
ip->ip_len = htons(len);
|
|
ip->ip_id = ip_newid();
|
|
ip->ip_off = htons(IP_DF);
|
|
ip->ip_ttl = CARP_DFLTTL;
|
|
ip->ip_p = IPPROTO_CARP;
|
|
ip->ip_sum = 0;
|
|
|
|
bzero(&sa, sizeof(sa));
|
|
sa.sa_family = AF_INET;
|
|
ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
|
|
if (ifa != NULL) {
|
|
ip->ip_src.s_addr =
|
|
ifatoia(ifa)->ia_addr.sin_addr.s_addr;
|
|
ifa_free(ifa);
|
|
} else
|
|
ip->ip_src.s_addr = 0;
|
|
ip->ip_dst.s_addr = htonl(INADDR_CARP_GROUP);
|
|
|
|
ch_ptr = (struct carp_header *)(&ip[1]);
|
|
bcopy(&ch, ch_ptr, sizeof(ch));
|
|
if (carp_prepare_ad(m, sc, ch_ptr))
|
|
goto resched;
|
|
|
|
m->m_data += sizeof(*ip);
|
|
ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip));
|
|
m->m_data -= sizeof(*ip);
|
|
|
|
CARPSTATS_INC(carps_opackets);
|
|
|
|
if (ip_output(m, NULL, NULL, IP_RAWOUTPUT,
|
|
&sc->sc_carpdev->if_carp->cif_imo, NULL)) {
|
|
if (sc->sc_sendad_errors < INT_MAX)
|
|
sc->sc_sendad_errors++;
|
|
if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS)
|
|
carp_demote_adj(V_carp_senderr_adj,
|
|
"send error");
|
|
sc->sc_sendad_success = 0;
|
|
} else {
|
|
if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
|
|
if (++sc->sc_sendad_success >=
|
|
CARP_SENDAD_MIN_SUCCESS) {
|
|
carp_demote_adj(-V_carp_senderr_adj,
|
|
"send ok");
|
|
sc->sc_sendad_errors = 0;
|
|
}
|
|
} else
|
|
sc->sc_sendad_errors = 0;
|
|
}
|
|
}
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
if (sc->sc_naddrs6) {
|
|
struct ip6_hdr *ip6;
|
|
|
|
m = m_gethdr(M_NOWAIT, MT_DATA);
|
|
if (m == NULL) {
|
|
CARPSTATS_INC(carps_onomem);
|
|
goto resched;
|
|
}
|
|
len = sizeof(*ip6) + sizeof(ch);
|
|
m->m_pkthdr.len = len;
|
|
m->m_pkthdr.rcvif = NULL;
|
|
m->m_len = len;
|
|
MH_ALIGN(m, m->m_len);
|
|
m->m_flags |= M_MCAST;
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
bzero(ip6, sizeof(*ip6));
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
|
ip6->ip6_hlim = CARP_DFLTTL;
|
|
ip6->ip6_nxt = IPPROTO_CARP;
|
|
bzero(&sa, sizeof(sa));
|
|
|
|
/* set the source address */
|
|
sa.sa_family = AF_INET6;
|
|
ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
|
|
if (ifa != NULL) {
|
|
bcopy(IFA_IN6(ifa), &ip6->ip6_src,
|
|
sizeof(struct in6_addr));
|
|
ifa_free(ifa);
|
|
} else
|
|
/* This should never happen with IPv6. */
|
|
bzero(&ip6->ip6_src, sizeof(struct in6_addr));
|
|
|
|
/* Set the multicast destination. */
|
|
ip6->ip6_dst.s6_addr16[0] = htons(0xff02);
|
|
ip6->ip6_dst.s6_addr8[15] = 0x12;
|
|
if (in6_setscope(&ip6->ip6_dst, sc->sc_carpdev, NULL) != 0) {
|
|
m_freem(m);
|
|
CARP_DEBUG("%s: in6_setscope failed\n", __func__);
|
|
goto resched;
|
|
}
|
|
|
|
ch_ptr = (struct carp_header *)(&ip6[1]);
|
|
bcopy(&ch, ch_ptr, sizeof(ch));
|
|
if (carp_prepare_ad(m, sc, ch_ptr))
|
|
goto resched;
|
|
|
|
m->m_data += sizeof(*ip6);
|
|
ch_ptr->carp_cksum = in_cksum(m, len - sizeof(*ip6));
|
|
m->m_data -= sizeof(*ip6);
|
|
|
|
CARPSTATS_INC(carps_opackets6);
|
|
|
|
if (ip6_output(m, NULL, NULL, 0,
|
|
&sc->sc_carpdev->if_carp->cif_im6o, NULL, NULL)) {
|
|
if (sc->sc_sendad_errors < INT_MAX)
|
|
sc->sc_sendad_errors++;
|
|
if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS)
|
|
carp_demote_adj(V_carp_senderr_adj,
|
|
"send6 error");
|
|
sc->sc_sendad_success = 0;
|
|
} else {
|
|
if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS) {
|
|
if (++sc->sc_sendad_success >=
|
|
CARP_SENDAD_MIN_SUCCESS) {
|
|
carp_demote_adj(-V_carp_senderr_adj,
|
|
"send6 ok");
|
|
sc->sc_sendad_errors = 0;
|
|
}
|
|
} else
|
|
sc->sc_sendad_errors = 0;
|
|
}
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
resched:
|
|
callout_reset(&sc->sc_ad_tmo, tvtohz(&tv), carp_send_ad, sc);
|
|
}
|
|
|
|
static void
|
|
carp_addroute(struct carp_softc *sc)
|
|
{
|
|
struct ifaddr *ifa;
|
|
|
|
CARP_FOREACH_IFA(sc, ifa)
|
|
carp_ifa_addroute(ifa);
|
|
}
|
|
|
|
static void
|
|
carp_ifa_addroute(struct ifaddr *ifa)
|
|
{
|
|
|
|
switch (ifa->ifa_addr->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
in_addprefix(ifatoia(ifa), RTF_UP);
|
|
ifa_add_loopback_route(ifa,
|
|
(struct sockaddr *)&ifatoia(ifa)->ia_addr);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
ifa_add_loopback_route(ifa,
|
|
(struct sockaddr *)&ifatoia6(ifa)->ia_addr);
|
|
in6_ifaddloop(ifa);
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static void
|
|
carp_delroute(struct carp_softc *sc)
|
|
{
|
|
struct ifaddr *ifa;
|
|
|
|
CARP_FOREACH_IFA(sc, ifa)
|
|
carp_ifa_delroute(ifa);
|
|
}
|
|
|
|
static void
|
|
carp_ifa_delroute(struct ifaddr *ifa)
|
|
{
|
|
|
|
switch (ifa->ifa_addr->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
ifa_del_loopback_route(ifa,
|
|
(struct sockaddr *)&ifatoia(ifa)->ia_addr);
|
|
in_scrubprefix(ifatoia(ifa), LLE_STATIC);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
ifa_del_loopback_route(ifa,
|
|
(struct sockaddr *)&ifatoia6(ifa)->ia_addr);
|
|
in6_ifremloop(ifa);
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
int
|
|
carp_master(struct ifaddr *ifa)
|
|
{
|
|
struct carp_softc *sc = ifa->ifa_carp;
|
|
|
|
return (sc->sc_state == MASTER);
|
|
}
|
|
|
|
#ifdef INET
|
|
/*
|
|
* Broadcast a gratuitous ARP request containing
|
|
* the virtual router MAC address for each IP address
|
|
* associated with the virtual router.
|
|
*/
|
|
static void
|
|
carp_send_arp(struct carp_softc *sc)
|
|
{
|
|
struct ifaddr *ifa;
|
|
|
|
CARP_FOREACH_IFA(sc, ifa)
|
|
if (ifa->ifa_addr->sa_family == AF_INET)
|
|
arp_ifinit2(sc->sc_carpdev, ifa, LLADDR(&sc->sc_addr));
|
|
}
|
|
|
|
int
|
|
carp_iamatch(struct ifaddr *ifa, uint8_t **enaddr)
|
|
{
|
|
struct carp_softc *sc = ifa->ifa_carp;
|
|
|
|
if (sc->sc_state == MASTER) {
|
|
*enaddr = LLADDR(&sc->sc_addr);
|
|
return (1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
static void
|
|
carp_send_na(struct carp_softc *sc)
|
|
{
|
|
static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
|
|
struct ifaddr *ifa;
|
|
struct in6_addr *in6;
|
|
|
|
CARP_FOREACH_IFA(sc, ifa) {
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
|
|
in6 = IFA_IN6(ifa);
|
|
nd6_na_output(sc->sc_carpdev, &mcast, in6,
|
|
ND_NA_FLAG_OVERRIDE, 1, NULL);
|
|
DELAY(1000); /* XXX */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns ifa in case it's a carp address and it is MASTER, or if the address
|
|
* matches and is not a carp address. Returns NULL otherwise.
|
|
*/
|
|
struct ifaddr *
|
|
carp_iamatch6(struct ifnet *ifp, struct in6_addr *taddr)
|
|
{
|
|
struct ifaddr *ifa;
|
|
|
|
ifa = NULL;
|
|
IF_ADDR_RLOCK(ifp);
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
if (!IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa)))
|
|
continue;
|
|
if (ifa->ifa_carp && ifa->ifa_carp->sc_state != MASTER)
|
|
ifa = NULL;
|
|
else
|
|
ifa_ref(ifa);
|
|
break;
|
|
}
|
|
IF_ADDR_RUNLOCK(ifp);
|
|
|
|
return (ifa);
|
|
}
|
|
|
|
caddr_t
|
|
carp_macmatch6(struct ifnet *ifp, struct mbuf *m, const struct in6_addr *taddr)
|
|
{
|
|
struct ifaddr *ifa;
|
|
|
|
IF_ADDR_RLOCK(ifp);
|
|
IFNET_FOREACH_IFA(ifp, ifa)
|
|
if (ifa->ifa_addr->sa_family == AF_INET6 &&
|
|
IN6_ARE_ADDR_EQUAL(taddr, IFA_IN6(ifa))) {
|
|
struct carp_softc *sc = ifa->ifa_carp;
|
|
struct m_tag *mtag;
|
|
|
|
IF_ADDR_RUNLOCK(ifp);
|
|
|
|
mtag = m_tag_get(PACKET_TAG_CARP,
|
|
sizeof(struct carp_softc *), M_NOWAIT);
|
|
if (mtag == NULL)
|
|
/* Better a bit than nothing. */
|
|
return (LLADDR(&sc->sc_addr));
|
|
|
|
bcopy(&sc, mtag + 1, sizeof(sc));
|
|
m_tag_prepend(m, mtag);
|
|
|
|
return (LLADDR(&sc->sc_addr));
|
|
}
|
|
IF_ADDR_RUNLOCK(ifp);
|
|
|
|
return (NULL);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
int
|
|
carp_forus(struct ifnet *ifp, u_char *dhost)
|
|
{
|
|
struct carp_softc *sc;
|
|
uint8_t *ena = dhost;
|
|
|
|
if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
|
|
return (0);
|
|
|
|
CIF_LOCK(ifp->if_carp);
|
|
IFNET_FOREACH_CARP(ifp, sc) {
|
|
CARP_LOCK(sc);
|
|
if (sc->sc_state == MASTER && !bcmp(dhost, LLADDR(&sc->sc_addr),
|
|
ETHER_ADDR_LEN)) {
|
|
CARP_UNLOCK(sc);
|
|
CIF_UNLOCK(ifp->if_carp);
|
|
return (1);
|
|
}
|
|
CARP_UNLOCK(sc);
|
|
}
|
|
CIF_UNLOCK(ifp->if_carp);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Master down timeout event, executed in callout context. */
|
|
static void
|
|
carp_master_down(void *v)
|
|
{
|
|
struct carp_softc *sc = v;
|
|
|
|
CARP_LOCK_ASSERT(sc);
|
|
|
|
CURVNET_SET(sc->sc_carpdev->if_vnet);
|
|
if (sc->sc_state == BACKUP) {
|
|
CARP_LOG("VHID %u@%s: BACKUP -> MASTER (master down)\n",
|
|
sc->sc_vhid,
|
|
sc->sc_carpdev->if_xname);
|
|
carp_master_down_locked(sc);
|
|
}
|
|
CURVNET_RESTORE();
|
|
|
|
CARP_UNLOCK(sc);
|
|
}
|
|
|
|
static void
|
|
carp_master_down_locked(struct carp_softc *sc)
|
|
{
|
|
|
|
CARP_LOCK_ASSERT(sc);
|
|
|
|
switch (sc->sc_state) {
|
|
case BACKUP:
|
|
carp_set_state(sc, MASTER);
|
|
carp_send_ad_locked(sc);
|
|
#ifdef INET
|
|
carp_send_arp(sc);
|
|
#endif
|
|
#ifdef INET6
|
|
carp_send_na(sc);
|
|
#endif
|
|
carp_setrun(sc, 0);
|
|
carp_addroute(sc);
|
|
break;
|
|
case INIT:
|
|
case MASTER:
|
|
#ifdef INVARIANTS
|
|
panic("carp: VHID %u@%s: master_down event in %s state\n",
|
|
sc->sc_vhid,
|
|
sc->sc_carpdev->if_xname,
|
|
sc->sc_state ? "MASTER" : "INIT");
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* When in backup state, af indicates whether to reset the master down timer
|
|
* for v4 or v6. If it's set to zero, reset the ones which are already pending.
|
|
*/
|
|
static void
|
|
carp_setrun(struct carp_softc *sc, sa_family_t af)
|
|
{
|
|
struct timeval tv;
|
|
|
|
CARP_LOCK_ASSERT(sc);
|
|
|
|
if ((sc->sc_carpdev->if_flags & IFF_UP) == 0 ||
|
|
sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
|
|
(sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0))
|
|
return;
|
|
|
|
switch (sc->sc_state) {
|
|
case INIT:
|
|
CARP_LOG("VHID %u@%s: INIT -> BACKUP\n",
|
|
sc->sc_vhid,
|
|
sc->sc_carpdev->if_xname);
|
|
carp_set_state(sc, BACKUP);
|
|
carp_setrun(sc, 0);
|
|
break;
|
|
case BACKUP:
|
|
callout_stop(&sc->sc_ad_tmo);
|
|
tv.tv_sec = 3 * sc->sc_advbase;
|
|
tv.tv_usec = sc->sc_advskew * 1000000 / 256;
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
|
|
carp_master_down, sc);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
|
|
carp_master_down, sc);
|
|
break;
|
|
#endif
|
|
default:
|
|
#ifdef INET
|
|
if (sc->sc_naddrs)
|
|
callout_reset(&sc->sc_md_tmo, tvtohz(&tv),
|
|
carp_master_down, sc);
|
|
#endif
|
|
#ifdef INET6
|
|
if (sc->sc_naddrs6)
|
|
callout_reset(&sc->sc_md6_tmo, tvtohz(&tv),
|
|
carp_master_down, sc);
|
|
#endif
|
|
break;
|
|
}
|
|
break;
|
|
case MASTER:
|
|
tv.tv_sec = sc->sc_advbase;
|
|
tv.tv_usec = sc->sc_advskew * 1000000 / 256;
|
|
callout_reset(&sc->sc_ad_tmo, tvtohz(&tv),
|
|
carp_send_ad, sc);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Setup multicast structures.
|
|
*/
|
|
static int
|
|
carp_multicast_setup(struct carp_if *cif, sa_family_t sa)
|
|
{
|
|
struct ifnet *ifp = cif->cif_ifp;
|
|
int error = 0;
|
|
|
|
CIF_LOCK_ASSERT(cif);
|
|
|
|
switch (sa) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
{
|
|
struct ip_moptions *imo = &cif->cif_imo;
|
|
struct in_addr addr;
|
|
|
|
if (imo->imo_membership)
|
|
return (0);
|
|
|
|
imo->imo_membership = (struct in_multi **)malloc(
|
|
(sizeof(struct in_multi *) * IP_MIN_MEMBERSHIPS), M_CARP,
|
|
M_NOWAIT);
|
|
if (imo->imo_membership == NULL)
|
|
return (ENOMEM);
|
|
imo->imo_mfilters = NULL;
|
|
imo->imo_max_memberships = IP_MIN_MEMBERSHIPS;
|
|
imo->imo_multicast_vif = -1;
|
|
|
|
addr.s_addr = htonl(INADDR_CARP_GROUP);
|
|
if ((error = in_joingroup(ifp, &addr, NULL,
|
|
&imo->imo_membership[0])) != 0) {
|
|
free(imo->imo_membership, M_CARP);
|
|
break;
|
|
}
|
|
imo->imo_num_memberships++;
|
|
imo->imo_multicast_ifp = ifp;
|
|
imo->imo_multicast_ttl = CARP_DFLTTL;
|
|
imo->imo_multicast_loop = 0;
|
|
break;
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
{
|
|
struct ip6_moptions *im6o = &cif->cif_im6o;
|
|
struct in6_addr in6;
|
|
struct in6_multi *in6m;
|
|
|
|
if (im6o->im6o_membership)
|
|
return (0);
|
|
|
|
im6o->im6o_membership = (struct in6_multi **)malloc(
|
|
(sizeof(struct in6_multi *) * IPV6_MIN_MEMBERSHIPS), M_CARP,
|
|
M_ZERO | M_NOWAIT);
|
|
if (im6o->im6o_membership == NULL)
|
|
return (ENOMEM);
|
|
im6o->im6o_mfilters = NULL;
|
|
im6o->im6o_max_memberships = IPV6_MIN_MEMBERSHIPS;
|
|
im6o->im6o_multicast_hlim = CARP_DFLTTL;
|
|
im6o->im6o_multicast_ifp = ifp;
|
|
|
|
/* Join IPv6 CARP multicast group. */
|
|
bzero(&in6, sizeof(in6));
|
|
in6.s6_addr16[0] = htons(0xff02);
|
|
in6.s6_addr8[15] = 0x12;
|
|
if ((error = in6_setscope(&in6, ifp, NULL)) != 0) {
|
|
free(im6o->im6o_membership, M_CARP);
|
|
break;
|
|
}
|
|
in6m = NULL;
|
|
if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) {
|
|
free(im6o->im6o_membership, M_CARP);
|
|
break;
|
|
}
|
|
im6o->im6o_membership[0] = in6m;
|
|
im6o->im6o_num_memberships++;
|
|
|
|
/* Join solicited multicast address. */
|
|
bzero(&in6, sizeof(in6));
|
|
in6.s6_addr16[0] = htons(0xff02);
|
|
in6.s6_addr32[1] = 0;
|
|
in6.s6_addr32[2] = htonl(1);
|
|
in6.s6_addr32[3] = 0;
|
|
in6.s6_addr8[12] = 0xff;
|
|
if ((error = in6_setscope(&in6, ifp, NULL)) != 0) {
|
|
in6_mc_leave(im6o->im6o_membership[0], NULL);
|
|
free(im6o->im6o_membership, M_CARP);
|
|
break;
|
|
}
|
|
in6m = NULL;
|
|
if ((error = in6_mc_join(ifp, &in6, NULL, &in6m, 0)) != 0) {
|
|
in6_mc_leave(im6o->im6o_membership[0], NULL);
|
|
free(im6o->im6o_membership, M_CARP);
|
|
break;
|
|
}
|
|
im6o->im6o_membership[1] = in6m;
|
|
im6o->im6o_num_memberships++;
|
|
break;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Free multicast structures.
|
|
*/
|
|
static void
|
|
carp_multicast_cleanup(struct carp_if *cif, sa_family_t sa)
|
|
{
|
|
|
|
CIF_LOCK_ASSERT(cif);
|
|
switch (sa) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
if (cif->cif_naddrs == 0) {
|
|
struct ip_moptions *imo = &cif->cif_imo;
|
|
|
|
in_leavegroup(imo->imo_membership[0], NULL);
|
|
KASSERT(imo->imo_mfilters == NULL,
|
|
("%s: imo_mfilters != NULL", __func__));
|
|
free(imo->imo_membership, M_CARP);
|
|
imo->imo_membership = NULL;
|
|
|
|
}
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (cif->cif_naddrs6 == 0) {
|
|
struct ip6_moptions *im6o = &cif->cif_im6o;
|
|
|
|
in6_mc_leave(im6o->im6o_membership[0], NULL);
|
|
in6_mc_leave(im6o->im6o_membership[1], NULL);
|
|
KASSERT(im6o->im6o_mfilters == NULL,
|
|
("%s: im6o_mfilters != NULL", __func__));
|
|
free(im6o->im6o_membership, M_CARP);
|
|
im6o->im6o_membership = NULL;
|
|
}
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
int
|
|
carp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa)
|
|
{
|
|
struct m_tag *mtag;
|
|
struct carp_softc *sc;
|
|
|
|
if (!sa)
|
|
return (0);
|
|
|
|
switch (sa->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
break;
|
|
#endif
|
|
default:
|
|
return (0);
|
|
}
|
|
|
|
mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
|
|
if (mtag == NULL)
|
|
return (0);
|
|
|
|
bcopy(mtag + 1, &sc, sizeof(sc));
|
|
|
|
/* Set the source MAC address to the Virtual Router MAC Address. */
|
|
switch (ifp->if_type) {
|
|
case IFT_ETHER:
|
|
case IFT_BRIDGE:
|
|
case IFT_L2VLAN: {
|
|
struct ether_header *eh;
|
|
|
|
eh = mtod(m, struct ether_header *);
|
|
eh->ether_shost[0] = 0;
|
|
eh->ether_shost[1] = 0;
|
|
eh->ether_shost[2] = 0x5e;
|
|
eh->ether_shost[3] = 0;
|
|
eh->ether_shost[4] = 1;
|
|
eh->ether_shost[5] = sc->sc_vhid;
|
|
}
|
|
break;
|
|
case IFT_FDDI: {
|
|
struct fddi_header *fh;
|
|
|
|
fh = mtod(m, struct fddi_header *);
|
|
fh->fddi_shost[0] = 0;
|
|
fh->fddi_shost[1] = 0;
|
|
fh->fddi_shost[2] = 0x5e;
|
|
fh->fddi_shost[3] = 0;
|
|
fh->fddi_shost[4] = 1;
|
|
fh->fddi_shost[5] = sc->sc_vhid;
|
|
}
|
|
break;
|
|
case IFT_ISO88025: {
|
|
struct iso88025_header *th;
|
|
th = mtod(m, struct iso88025_header *);
|
|
th->iso88025_shost[0] = 3;
|
|
th->iso88025_shost[1] = 0;
|
|
th->iso88025_shost[2] = 0x40 >> (sc->sc_vhid - 1);
|
|
th->iso88025_shost[3] = 0x40000 >> (sc->sc_vhid - 1);
|
|
th->iso88025_shost[4] = 0;
|
|
th->iso88025_shost[5] = 0;
|
|
}
|
|
break;
|
|
default:
|
|
printf("%s: carp is not supported for the %d interface type\n",
|
|
ifp->if_xname, ifp->if_type);
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static struct carp_softc*
|
|
carp_alloc(struct ifnet *ifp)
|
|
{
|
|
struct carp_softc *sc;
|
|
struct carp_if *cif;
|
|
|
|
if ((cif = ifp->if_carp) == NULL) {
|
|
cif = carp_alloc_if(ifp);
|
|
if (cif == NULL)
|
|
return (NULL);
|
|
}
|
|
|
|
sc = malloc(sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
|
|
|
|
sc->sc_advbase = CARP_DFLTINTV;
|
|
sc->sc_vhid = -1; /* required setting */
|
|
sc->sc_init_counter = 1;
|
|
sc->sc_state = INIT;
|
|
|
|
sc->sc_ifasiz = sizeof(struct ifaddr *);
|
|
sc->sc_ifas = malloc(sc->sc_ifasiz, M_CARP, M_WAITOK|M_ZERO);
|
|
sc->sc_carpdev = ifp;
|
|
|
|
CARP_LOCK_INIT(sc);
|
|
#ifdef INET
|
|
callout_init_mtx(&sc->sc_md_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
|
|
#endif
|
|
#ifdef INET6
|
|
callout_init_mtx(&sc->sc_md6_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
|
|
#endif
|
|
callout_init_mtx(&sc->sc_ad_tmo, &sc->sc_mtx, CALLOUT_RETURNUNLOCKED);
|
|
|
|
CIF_LOCK(cif);
|
|
TAILQ_INSERT_TAIL(&cif->cif_vrs, sc, sc_list);
|
|
CIF_UNLOCK(cif);
|
|
|
|
mtx_lock(&carp_mtx);
|
|
LIST_INSERT_HEAD(&carp_list, sc, sc_next);
|
|
mtx_unlock(&carp_mtx);
|
|
|
|
return (sc);
|
|
}
|
|
|
|
static int
|
|
carp_grow_ifas(struct carp_softc *sc)
|
|
{
|
|
struct ifaddr **new;
|
|
|
|
CARP_LOCK_ASSERT(sc);
|
|
|
|
new = malloc(sc->sc_ifasiz * 2, M_CARP, M_NOWAIT|M_ZERO);
|
|
if (new == NULL)
|
|
return (ENOMEM);
|
|
bcopy(sc->sc_ifas, new, sc->sc_ifasiz);
|
|
free(sc->sc_ifas, M_CARP);
|
|
sc->sc_ifas = new;
|
|
sc->sc_ifasiz *= 2;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
carp_destroy(struct carp_softc *sc)
|
|
{
|
|
struct ifnet *ifp = sc->sc_carpdev;
|
|
struct carp_if *cif = ifp->if_carp;
|
|
|
|
CIF_LOCK_ASSERT(cif);
|
|
|
|
TAILQ_REMOVE(&cif->cif_vrs, sc, sc_list);
|
|
|
|
mtx_lock(&carp_mtx);
|
|
LIST_REMOVE(sc, sc_next);
|
|
mtx_unlock(&carp_mtx);
|
|
|
|
CARP_LOCK(sc);
|
|
if (sc->sc_suppress)
|
|
carp_demote_adj(-V_carp_ifdown_adj, "vhid removed");
|
|
callout_drain(&sc->sc_ad_tmo);
|
|
#ifdef INET
|
|
callout_drain(&sc->sc_md_tmo);
|
|
#endif
|
|
#ifdef INET6
|
|
callout_drain(&sc->sc_md6_tmo);
|
|
#endif
|
|
CARP_LOCK_DESTROY(sc);
|
|
|
|
free(sc->sc_ifas, M_CARP);
|
|
free(sc, M_CARP);
|
|
}
|
|
|
|
static struct carp_if*
|
|
carp_alloc_if(struct ifnet *ifp)
|
|
{
|
|
struct carp_if *cif;
|
|
|
|
cif = malloc(sizeof(*cif), M_CARP, M_WAITOK|M_ZERO);
|
|
|
|
if (ifpromisc(ifp, 1) != 0)
|
|
goto cleanup;
|
|
|
|
CIF_LOCK_INIT(cif);
|
|
cif->cif_ifp = ifp;
|
|
TAILQ_INIT(&cif->cif_vrs);
|
|
|
|
IF_ADDR_WLOCK(ifp);
|
|
ifp->if_carp = cif;
|
|
if_ref(ifp);
|
|
IF_ADDR_WUNLOCK(ifp);
|
|
|
|
return (cif);
|
|
|
|
cleanup:
|
|
free(cif, M_CARP);
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
static void
|
|
carp_free_if(struct carp_if *cif)
|
|
{
|
|
struct ifnet *ifp = cif->cif_ifp;
|
|
|
|
CIF_LOCK_ASSERT(cif);
|
|
KASSERT(TAILQ_EMPTY(&cif->cif_vrs), ("%s: softc list not empty",
|
|
__func__));
|
|
|
|
IF_ADDR_WLOCK(ifp);
|
|
ifp->if_carp = NULL;
|
|
IF_ADDR_WUNLOCK(ifp);
|
|
|
|
CIF_LOCK_DESTROY(cif);
|
|
|
|
ifpromisc(ifp, 0);
|
|
if_rele(ifp);
|
|
|
|
free(cif, M_CARP);
|
|
}
|
|
|
|
static void
|
|
carp_carprcp(struct carpreq *carpr, struct carp_softc *sc, int priv)
|
|
{
|
|
|
|
CARP_LOCK(sc);
|
|
carpr->carpr_state = sc->sc_state;
|
|
carpr->carpr_vhid = sc->sc_vhid;
|
|
carpr->carpr_advbase = sc->sc_advbase;
|
|
carpr->carpr_advskew = sc->sc_advskew;
|
|
if (priv)
|
|
bcopy(sc->sc_key, carpr->carpr_key, sizeof(carpr->carpr_key));
|
|
else
|
|
bzero(carpr->carpr_key, sizeof(carpr->carpr_key));
|
|
CARP_UNLOCK(sc);
|
|
}
|
|
|
|
int
|
|
carp_ioctl(struct ifreq *ifr, u_long cmd, struct thread *td)
|
|
{
|
|
struct carpreq carpr;
|
|
struct ifnet *ifp;
|
|
struct carp_softc *sc = NULL;
|
|
int error = 0, locked = 0;
|
|
|
|
if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
|
|
return (error);
|
|
|
|
ifp = ifunit_ref(ifr->ifr_name);
|
|
if (ifp == NULL)
|
|
return (ENXIO);
|
|
|
|
switch (ifp->if_type) {
|
|
case IFT_ETHER:
|
|
case IFT_L2VLAN:
|
|
case IFT_BRIDGE:
|
|
case IFT_FDDI:
|
|
case IFT_ISO88025:
|
|
break;
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
|
|
error = EADDRNOTAVAIL;
|
|
goto out;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case SIOCSVH:
|
|
if ((error = priv_check(td, PRIV_NETINET_CARP)))
|
|
break;
|
|
if (carpr.carpr_vhid <= 0 || carpr.carpr_vhid > CARP_MAXVHID ||
|
|
carpr.carpr_advbase < 0 || carpr.carpr_advskew < 0) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (ifp->if_carp) {
|
|
CIF_LOCK(ifp->if_carp);
|
|
IFNET_FOREACH_CARP(ifp, sc)
|
|
if (sc->sc_vhid == carpr.carpr_vhid)
|
|
break;
|
|
CIF_UNLOCK(ifp->if_carp);
|
|
}
|
|
if (sc == NULL) {
|
|
sc = carp_alloc(ifp);
|
|
if (sc == NULL) {
|
|
error = EINVAL; /* XXX: ifpromisc failed */
|
|
break;
|
|
}
|
|
|
|
CARP_LOCK(sc);
|
|
sc->sc_vhid = carpr.carpr_vhid;
|
|
LLADDR(&sc->sc_addr)[0] = 0;
|
|
LLADDR(&sc->sc_addr)[1] = 0;
|
|
LLADDR(&sc->sc_addr)[2] = 0x5e;
|
|
LLADDR(&sc->sc_addr)[3] = 0;
|
|
LLADDR(&sc->sc_addr)[4] = 1;
|
|
LLADDR(&sc->sc_addr)[5] = sc->sc_vhid;
|
|
} else
|
|
CARP_LOCK(sc);
|
|
locked = 1;
|
|
if (carpr.carpr_advbase > 0) {
|
|
if (carpr.carpr_advbase > 255 ||
|
|
carpr.carpr_advbase < CARP_DFLTINTV) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
sc->sc_advbase = carpr.carpr_advbase;
|
|
}
|
|
if (carpr.carpr_advskew > 0) {
|
|
if (carpr.carpr_advskew >= 255) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
sc->sc_advskew = carpr.carpr_advskew;
|
|
}
|
|
if (carpr.carpr_key[0] != '\0') {
|
|
bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
|
|
carp_hmac_prepare(sc);
|
|
}
|
|
if (sc->sc_state != INIT &&
|
|
carpr.carpr_state != sc->sc_state) {
|
|
switch (carpr.carpr_state) {
|
|
case BACKUP:
|
|
callout_stop(&sc->sc_ad_tmo);
|
|
carp_set_state(sc, BACKUP);
|
|
carp_setrun(sc, 0);
|
|
carp_delroute(sc);
|
|
break;
|
|
case MASTER:
|
|
carp_master_down_locked(sc);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case SIOCGVH:
|
|
{
|
|
int priveleged;
|
|
|
|
if (carpr.carpr_vhid < 0 || carpr.carpr_vhid > CARP_MAXVHID) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
if (carpr.carpr_count < 1) {
|
|
error = EMSGSIZE;
|
|
break;
|
|
}
|
|
if (ifp->if_carp == NULL) {
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
|
|
priveleged = (priv_check(td, PRIV_NETINET_CARP) == 0);
|
|
if (carpr.carpr_vhid != 0) {
|
|
CIF_LOCK(ifp->if_carp);
|
|
IFNET_FOREACH_CARP(ifp, sc)
|
|
if (sc->sc_vhid == carpr.carpr_vhid)
|
|
break;
|
|
CIF_UNLOCK(ifp->if_carp);
|
|
if (sc == NULL) {
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
carp_carprcp(&carpr, sc, priveleged);
|
|
error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
|
|
} else {
|
|
int i, count;
|
|
|
|
count = 0;
|
|
CIF_LOCK(ifp->if_carp);
|
|
IFNET_FOREACH_CARP(ifp, sc)
|
|
count++;
|
|
|
|
if (count > carpr.carpr_count) {
|
|
CIF_UNLOCK(ifp->if_carp);
|
|
error = EMSGSIZE;
|
|
break;
|
|
}
|
|
|
|
i = 0;
|
|
IFNET_FOREACH_CARP(ifp, sc) {
|
|
carp_carprcp(&carpr, sc, priveleged);
|
|
carpr.carpr_count = count;
|
|
error = copyout(&carpr, ifr->ifr_data +
|
|
(i * sizeof(carpr)), sizeof(carpr));
|
|
if (error) {
|
|
CIF_UNLOCK(ifp->if_carp);
|
|
break;
|
|
}
|
|
i++;
|
|
}
|
|
CIF_UNLOCK(ifp->if_carp);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
error = EINVAL;
|
|
}
|
|
|
|
out:
|
|
if (locked)
|
|
CARP_UNLOCK(sc);
|
|
if_rele(ifp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
carp_get_vhid(struct ifaddr *ifa)
|
|
{
|
|
|
|
if (ifa == NULL || ifa->ifa_carp == NULL)
|
|
return (0);
|
|
|
|
return (ifa->ifa_carp->sc_vhid);
|
|
}
|
|
|
|
int
|
|
carp_attach(struct ifaddr *ifa, int vhid)
|
|
{
|
|
struct ifnet *ifp = ifa->ifa_ifp;
|
|
struct carp_if *cif = ifp->if_carp;
|
|
struct carp_softc *sc;
|
|
int index, error;
|
|
|
|
if (ifp->if_carp == NULL)
|
|
return (ENOPROTOOPT);
|
|
|
|
switch (ifa->ifa_addr->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
#endif
|
|
break;
|
|
default:
|
|
return (EPROTOTYPE);
|
|
}
|
|
|
|
CIF_LOCK(cif);
|
|
IFNET_FOREACH_CARP(ifp, sc)
|
|
if (sc->sc_vhid == vhid)
|
|
break;
|
|
if (sc == NULL) {
|
|
CIF_UNLOCK(cif);
|
|
return (ENOENT);
|
|
}
|
|
|
|
if (ifa->ifa_carp) {
|
|
if (ifa->ifa_carp->sc_vhid != vhid)
|
|
carp_detach_locked(ifa);
|
|
else {
|
|
CIF_UNLOCK(cif);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
error = carp_multicast_setup(cif, ifa->ifa_addr->sa_family);
|
|
if (error) {
|
|
CIF_FREE(cif);
|
|
return (error);
|
|
}
|
|
|
|
CARP_LOCK(sc);
|
|
index = sc->sc_naddrs + sc->sc_naddrs6 + 1;
|
|
if (index > sc->sc_ifasiz / sizeof(struct ifaddr *))
|
|
if ((error = carp_grow_ifas(sc)) != 0) {
|
|
carp_multicast_cleanup(cif,
|
|
ifa->ifa_addr->sa_family);
|
|
CARP_UNLOCK(sc);
|
|
CIF_FREE(cif);
|
|
return (error);
|
|
}
|
|
|
|
switch (ifa->ifa_addr->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
cif->cif_naddrs++;
|
|
sc->sc_naddrs++;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
cif->cif_naddrs6++;
|
|
sc->sc_naddrs6++;
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
ifa_ref(ifa);
|
|
sc->sc_ifas[index - 1] = ifa;
|
|
ifa->ifa_carp = sc;
|
|
|
|
carp_hmac_prepare(sc);
|
|
carp_sc_state(sc);
|
|
|
|
CARP_UNLOCK(sc);
|
|
CIF_UNLOCK(cif);
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
carp_detach(struct ifaddr *ifa)
|
|
{
|
|
struct ifnet *ifp = ifa->ifa_ifp;
|
|
struct carp_if *cif = ifp->if_carp;
|
|
|
|
CIF_LOCK(cif);
|
|
carp_detach_locked(ifa);
|
|
CIF_FREE(cif);
|
|
}
|
|
|
|
static void
|
|
carp_detach_locked(struct ifaddr *ifa)
|
|
{
|
|
struct ifnet *ifp = ifa->ifa_ifp;
|
|
struct carp_if *cif = ifp->if_carp;
|
|
struct carp_softc *sc = ifa->ifa_carp;
|
|
int i, index;
|
|
|
|
KASSERT(sc != NULL, ("%s: %p not attached", __func__, ifa));
|
|
|
|
CIF_LOCK_ASSERT(cif);
|
|
CARP_LOCK(sc);
|
|
|
|
/* Shift array. */
|
|
index = sc->sc_naddrs + sc->sc_naddrs6;
|
|
for (i = 0; i < index; i++)
|
|
if (sc->sc_ifas[i] == ifa)
|
|
break;
|
|
KASSERT(i < index, ("%s: %p no backref", __func__, ifa));
|
|
for (; i < index - 1; i++)
|
|
sc->sc_ifas[i] = sc->sc_ifas[i+1];
|
|
sc->sc_ifas[index - 1] = NULL;
|
|
|
|
switch (ifa->ifa_addr->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
cif->cif_naddrs--;
|
|
sc->sc_naddrs--;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
cif->cif_naddrs6--;
|
|
sc->sc_naddrs6--;
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
carp_ifa_delroute(ifa);
|
|
carp_multicast_cleanup(cif, ifa->ifa_addr->sa_family);
|
|
|
|
ifa->ifa_carp = NULL;
|
|
ifa_free(ifa);
|
|
|
|
carp_hmac_prepare(sc);
|
|
carp_sc_state(sc);
|
|
|
|
if (sc->sc_naddrs == 0 && sc->sc_naddrs6 == 0) {
|
|
CARP_UNLOCK(sc);
|
|
carp_destroy(sc);
|
|
} else
|
|
CARP_UNLOCK(sc);
|
|
}
|
|
|
|
static void
|
|
carp_set_state(struct carp_softc *sc, int state)
|
|
{
|
|
|
|
CARP_LOCK_ASSERT(sc);
|
|
|
|
if (sc->sc_state != state) {
|
|
const char *carp_states[] = { CARP_STATES };
|
|
char subsys[IFNAMSIZ+5];
|
|
|
|
sc->sc_state = state;
|
|
|
|
snprintf(subsys, IFNAMSIZ+5, "%u@%s", sc->sc_vhid,
|
|
sc->sc_carpdev->if_xname);
|
|
devctl_notify("CARP", subsys, carp_states[state], NULL);
|
|
}
|
|
}
|
|
|
|
static void
|
|
carp_linkstate(struct ifnet *ifp)
|
|
{
|
|
struct carp_softc *sc;
|
|
|
|
CIF_LOCK(ifp->if_carp);
|
|
IFNET_FOREACH_CARP(ifp, sc) {
|
|
CARP_LOCK(sc);
|
|
carp_sc_state(sc);
|
|
CARP_UNLOCK(sc);
|
|
}
|
|
CIF_UNLOCK(ifp->if_carp);
|
|
}
|
|
|
|
static void
|
|
carp_sc_state(struct carp_softc *sc)
|
|
{
|
|
|
|
CARP_LOCK_ASSERT(sc);
|
|
|
|
if (sc->sc_carpdev->if_link_state != LINK_STATE_UP ||
|
|
!(sc->sc_carpdev->if_flags & IFF_UP)) {
|
|
callout_stop(&sc->sc_ad_tmo);
|
|
#ifdef INET
|
|
callout_stop(&sc->sc_md_tmo);
|
|
#endif
|
|
#ifdef INET6
|
|
callout_stop(&sc->sc_md6_tmo);
|
|
#endif
|
|
carp_set_state(sc, INIT);
|
|
carp_setrun(sc, 0);
|
|
if (!sc->sc_suppress)
|
|
carp_demote_adj(V_carp_ifdown_adj, "interface down");
|
|
sc->sc_suppress = 1;
|
|
} else {
|
|
carp_set_state(sc, INIT);
|
|
carp_setrun(sc, 0);
|
|
if (sc->sc_suppress)
|
|
carp_demote_adj(-V_carp_ifdown_adj, "interface up");
|
|
sc->sc_suppress = 0;
|
|
}
|
|
}
|
|
|
|
static void
|
|
carp_demote_adj(int adj, char *reason)
|
|
{
|
|
atomic_add_int(&V_carp_demotion, adj);
|
|
CARP_LOG("demoted by %d to %d (%s)\n", adj, V_carp_demotion, reason);
|
|
taskqueue_enqueue(taskqueue_swi, &carp_sendall_task);
|
|
}
|
|
|
|
static int
|
|
carp_demote_adj_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int new, error;
|
|
|
|
new = V_carp_demotion;
|
|
error = sysctl_handle_int(oidp, &new, 0, req);
|
|
if (error || !req->newptr)
|
|
return (error);
|
|
|
|
carp_demote_adj(new, "sysctl");
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifdef INET
|
|
extern struct domain inetdomain;
|
|
static struct protosw in_carp_protosw = {
|
|
.pr_type = SOCK_RAW,
|
|
.pr_domain = &inetdomain,
|
|
.pr_protocol = IPPROTO_CARP,
|
|
.pr_flags = PR_ATOMIC|PR_ADDR,
|
|
.pr_input = carp_input,
|
|
.pr_output = (pr_output_t *)rip_output,
|
|
.pr_ctloutput = rip_ctloutput,
|
|
.pr_usrreqs = &rip_usrreqs
|
|
};
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
extern struct domain inet6domain;
|
|
static struct ip6protosw in6_carp_protosw = {
|
|
.pr_type = SOCK_RAW,
|
|
.pr_domain = &inet6domain,
|
|
.pr_protocol = IPPROTO_CARP,
|
|
.pr_flags = PR_ATOMIC|PR_ADDR,
|
|
.pr_input = carp6_input,
|
|
.pr_output = rip6_output,
|
|
.pr_ctloutput = rip6_ctloutput,
|
|
.pr_usrreqs = &rip6_usrreqs
|
|
};
|
|
#endif
|
|
|
|
static void
|
|
carp_mod_cleanup(void)
|
|
{
|
|
|
|
#ifdef INET
|
|
if (proto_reg[CARP_INET] == 0) {
|
|
(void)ipproto_unregister(IPPROTO_CARP);
|
|
pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW);
|
|
proto_reg[CARP_INET] = -1;
|
|
}
|
|
carp_iamatch_p = NULL;
|
|
#endif
|
|
#ifdef INET6
|
|
if (proto_reg[CARP_INET6] == 0) {
|
|
(void)ip6proto_unregister(IPPROTO_CARP);
|
|
pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW);
|
|
proto_reg[CARP_INET6] = -1;
|
|
}
|
|
carp_iamatch6_p = NULL;
|
|
carp_macmatch6_p = NULL;
|
|
#endif
|
|
carp_ioctl_p = NULL;
|
|
carp_attach_p = NULL;
|
|
carp_detach_p = NULL;
|
|
carp_get_vhid_p = NULL;
|
|
carp_linkstate_p = NULL;
|
|
carp_forus_p = NULL;
|
|
carp_output_p = NULL;
|
|
carp_demote_adj_p = NULL;
|
|
carp_master_p = NULL;
|
|
mtx_unlock(&carp_mtx);
|
|
taskqueue_drain(taskqueue_swi, &carp_sendall_task);
|
|
mtx_destroy(&carp_mtx);
|
|
}
|
|
|
|
static int
|
|
carp_mod_load(void)
|
|
{
|
|
int err;
|
|
|
|
mtx_init(&carp_mtx, "carp_mtx", NULL, MTX_DEF);
|
|
LIST_INIT(&carp_list);
|
|
carp_get_vhid_p = carp_get_vhid;
|
|
carp_forus_p = carp_forus;
|
|
carp_output_p = carp_output;
|
|
carp_linkstate_p = carp_linkstate;
|
|
carp_ioctl_p = carp_ioctl;
|
|
carp_attach_p = carp_attach;
|
|
carp_detach_p = carp_detach;
|
|
carp_demote_adj_p = carp_demote_adj;
|
|
carp_master_p = carp_master;
|
|
#ifdef INET6
|
|
carp_iamatch6_p = carp_iamatch6;
|
|
carp_macmatch6_p = carp_macmatch6;
|
|
proto_reg[CARP_INET6] = pf_proto_register(PF_INET6,
|
|
(struct protosw *)&in6_carp_protosw);
|
|
if (proto_reg[CARP_INET6]) {
|
|
printf("carp: error %d attaching to PF_INET6\n",
|
|
proto_reg[CARP_INET6]);
|
|
carp_mod_cleanup();
|
|
return (proto_reg[CARP_INET6]);
|
|
}
|
|
err = ip6proto_register(IPPROTO_CARP);
|
|
if (err) {
|
|
printf("carp: error %d registering with INET6\n", err);
|
|
carp_mod_cleanup();
|
|
return (err);
|
|
}
|
|
#endif
|
|
#ifdef INET
|
|
carp_iamatch_p = carp_iamatch;
|
|
proto_reg[CARP_INET] = pf_proto_register(PF_INET, &in_carp_protosw);
|
|
if (proto_reg[CARP_INET]) {
|
|
printf("carp: error %d attaching to PF_INET\n",
|
|
proto_reg[CARP_INET]);
|
|
carp_mod_cleanup();
|
|
return (proto_reg[CARP_INET]);
|
|
}
|
|
err = ipproto_register(IPPROTO_CARP);
|
|
if (err) {
|
|
printf("carp: error %d registering with INET\n", err);
|
|
carp_mod_cleanup();
|
|
return (err);
|
|
}
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
carp_modevent(module_t mod, int type, void *data)
|
|
{
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
return carp_mod_load();
|
|
/* NOTREACHED */
|
|
case MOD_UNLOAD:
|
|
mtx_lock(&carp_mtx);
|
|
if (LIST_EMPTY(&carp_list))
|
|
carp_mod_cleanup();
|
|
else {
|
|
mtx_unlock(&carp_mtx);
|
|
return (EBUSY);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static moduledata_t carp_mod = {
|
|
"carp",
|
|
carp_modevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE(carp, carp_mod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
|