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Second patch for CARP
| From: | Baptiste Ritter <baptiste.ritter@xxxxxxxxxxxxxxxx> |
| Date: | Tue, 29 May 2007 22:14:49 +0200 |
Hi all,
Here is an update of the patch, sent by Jonathan Buschmann on the kernel
mailing list (at the 14 march).
Differences between this patch and the first-one submitted on the kernel
mailing list :
- The announced IPv6 bug corrected (CARP interface which did not reply
to Neighbor Sollicitation)
- Some man pages was imported/updated
- LINT config file updated
- Code updated for "syncing" with CVS.
- Suppression of the code for "Report link states changes" witch was
in "conflict")
- The patch was generated (and tested) with the RSYNC/Devel snapshot
from May 20. (We had some difficulties with accessing the CVS
server for keeping our sources up to date. :-( )
- Code cleanup (nuke some commented-out code)
Notes :
- As Sacha Wildner suggest to Jonathan, we should add IFM_CARP to
ifmedia(4) man page. But, on reading other BSD man pages, they didn't
do that ; Should it be or not, and what add ? (According to the fact
that IFM_CARP is a "virtual" media")
- English is not our native language and the man page of PFSYNC from
DragonflyBSD is not the same than others BSD. So I added a paragraph
with CARP (imported from FreeBSD man page) ; It is just an example "in
the middle of nowhere in the man page" ; I find that a little bit
strange, may be there is a better choice...
- A lot of other things (I don't remember what...)
Regards,
--
Baptiste Ritter
diff --git a/etc/protocols b/etc/protocols
index 4399da5..fc04f48 100644
--- a/etc/protocols
+++ b/etc/protocols
@@ -120,7 +120,7 @@ ipcomp 108 IPComp # IP Payload Compress
snp 109 SNP # Sitara Networks Protocol
compaq-peer 110 Compaq-Peer # Compaq Peer Protocol
ipx-in-ip 111 IPX-in-IP # IPX in IP
-vrrp 112 VRRP # Virtual Router Redundancy Protocol
+carp 112 CARP vrrp # Common Address Redundancy Protocol
pgm 113 PGM # PGM Reliable Transport Protocol
# 114 # any 0-hop protocol
l2tp 115 L2TP # Layer Two Tunneling Protocol
diff --git a/sbin/ifconfig/Makefile b/sbin/ifconfig/Makefile
index c6556e6..f15aaa7 100644
--- a/sbin/ifconfig/Makefile
+++ b/sbin/ifconfig/Makefile
@@ -24,7 +24,7 @@ SRCS+= ifmedia.c # SIOC[GS]IFMEDIA supp
SRCS+= ifvlan.c # SIOC[GS]ETVLAN support
SRCS+= ifieee80211.c # SIOC[GS]IEEE80211 support
-#SRCS+= ifcarp.c # SIOC[GS]VH support
+SRCS+= ifcarp.c # SIOC[GS]VH support
#SRCS+= ifpfsync.c # pfsync(4) support
SRCS+= ifbridge.c # bridge support
diff --git a/sbin/ifconfig/ifcarp.c b/sbin/ifconfig/ifcarp.c
new file mode 100644
index 0000000..2ab73f3
--- /dev/null
+++ b/sbin/ifconfig/ifcarp.c
@@ -0,0 +1,200 @@
+/* $Id$ */
+/* from $FreeBSD: src/sbin/ifconfig/ifcarp.c,v 1.2 2005/02/22 14:07:47 glebius Exp $ */
+/* from $OpenBSD: ifconfig.c,v 1.82 2003/10/19 05:43:35 mcbride Exp $ */
+
+/*
+ * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
+ * Copyright (c) 2003 Ryan McBride. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <net/ethernet.h>
+#include <net/if.h>
+#include <netinet/ip_carp.h>
+#include <net/route.h>
+
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <err.h>
+#include <errno.h>
+
+#include "ifconfig.h"
+
+static const char *carp_states[] = { CARP_STATES };
+
+void carp_status(int s);
+void setcarp_advbase(const char *,int, int, const struct afswtch *rafp);
+void setcarp_advskew(const char *, int, int, const struct afswtch *rafp);
+void setcarp_passwd(const char *, int, int, const struct afswtch *rafp);
+void setcarp_vhid(const char *, int, int, const struct afswtch *rafp);
+
+void
+carp_status(int s)
+{
+ const char *state;
+ struct carpreq carpr;
+
+ memset((char *)&carpr, 0, sizeof(struct carpreq));
+ ifr.ifr_data = (caddr_t)&carpr;
+
+ if (ioctl(s, SIOCGVH, (caddr_t)&ifr) == -1)
+ return;
+
+ if (carpr.carpr_vhid > 0) {
+ if (carpr.carpr_state > CARP_MAXSTATE)
+ state = "<UNKNOWN>";
+ else
+ state = carp_states[carpr.carpr_state];
+
+ printf("\tcarp: %s vhid %d advbase %d advskew %d\n",
+ state, carpr.carpr_vhid, carpr.carpr_advbase,
+ carpr.carpr_advskew);
+ }
+
+ return;
+
+}
+
+void
+setcarp_passwd(const char *val, int d, int s, const struct afswtch *afp)
+{
+ struct carpreq carpr;
+
+ memset((char *)&carpr, 0, sizeof(struct carpreq));
+ ifr.ifr_data = (caddr_t)&carpr;
+
+ if (ioctl(s, SIOCGVH, (caddr_t)&ifr) == -1)
+ err(1, "SIOCGVH");
+
+ /* XXX Should hash the password into the key here, perhaps? */
+ strlcpy(carpr.carpr_key, val, CARP_KEY_LEN);
+
+ if (ioctl(s, SIOCSVH, (caddr_t)&ifr) == -1)
+ err(1, "SIOCSVH");
+
+ return;
+}
+
+void
+setcarp_vhid(const char *val, int d, int s, const struct afswtch *afp)
+{
+ int vhid;
+ struct carpreq carpr;
+
+ vhid = atoi(val);
+
+ if (vhid <= 0)
+ errx(1, "vhid must be greater than 0");
+
+ memset((char *)&carpr, 0, sizeof(struct carpreq));
+ ifr.ifr_data = (caddr_t)&carpr;
+
+ if (ioctl(s, SIOCGVH, (caddr_t)&ifr) == -1)
+ err(1, "SIOCGVH");
+
+ carpr.carpr_vhid = vhid;
+
+ if (ioctl(s, SIOCSVH, (caddr_t)&ifr) == -1)
+ err(1, "SIOCSVH");
+
+ return;
+}
+
+void
+setcarp_advskew(const char *val, int d, int s, const struct afswtch *afp)
+{
+ int advskew;
+ struct carpreq carpr;
+
+ advskew = atoi(val);
+
+ memset((char *)&carpr, 0, sizeof(struct carpreq));
+ ifr.ifr_data = (caddr_t)&carpr;
+
+ if (ioctl(s, SIOCGVH, (caddr_t)&ifr) == -1)
+ err(1, "SIOCGVH");
+
+ carpr.carpr_advskew = advskew;
+
+ if (ioctl(s, SIOCSVH, (caddr_t)&ifr) == -1)
+ err(1, "SIOCSVH");
+
+ return;
+}
+
+void
+setcarp_advbase(const char *val, int d, int s, const struct afswtch *afp)
+{
+ int advbase;
+ struct carpreq carpr;
+
+ advbase = atoi(val);
+
+ memset((char *)&carpr, 0, sizeof(struct carpreq));
+ ifr.ifr_data = (caddr_t)&carpr;
+
+ if (ioctl(s, SIOCGVH, (caddr_t)&ifr) == -1)
+ err(1, "SIOCGVH");
+
+ carpr.carpr_advbase = advbase;
+
+ if (ioctl(s, SIOCSVH, (caddr_t)&ifr) == -1)
+ err(1, "SIOCSVH");
+
+ return;
+}
+
+static struct cmd carp_cmds[] = {
+ DEF_CMD_ARG("advbase", setcarp_advbase),
+ DEF_CMD_ARG("advskew", setcarp_advskew),
+ DEF_CMD_ARG("pass", setcarp_passwd),
+ DEF_CMD_ARG("vhid", setcarp_vhid),
+};
+static struct afswtch af_carp = {
+ .af_name = "af_carp",
+ .af_af = AF_UNSPEC,
+ .af_other_status = carp_status,
+};
+
+static __constructor void
+carp_ctor(void)
+{
+#define N(a) (sizeof(a) / sizeof(a[0]))
+ int i;
+
+ for (i = 0; i < N(carp_cmds); i++)
+ cmd_register(&carp_cmds[i]);
+ af_register(&af_carp);
+#undef N
+}
diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
index c832cc1..e9820fb 100644
--- a/sbin/ifconfig/ifconfig.8
+++ b/sbin/ifconfig/ifconfig.8
@@ -28,8 +28,9 @@
.\" From: @(#)ifconfig.8 8.3 (Berkeley) 1/5/94
.\" $FreeBSD: src/sbin/ifconfig/ifconfig.8,v 1.124 2006/10/10 09:44:08 ru Exp $
.\" $DragonFly: src/sbin/ifconfig/ifconfig.8,v 1.19 2007/04/09 21:20:37 swildner Exp $
+
.\"
-.Dd November 19, 2006
+.Dd April 8, 2007
.Dt IFCONFIG 8
.Os
.Sh NAME
@@ -1388,6 +1389,31 @@ The
argument is useless and hence deprecated.
.El
.Pp
+The following parameters are specific to
+.Xr carp 4
+interfaces:
+.Bl -tag -width indent
+.It Cm advbase Ar seconds
+Specifies the base of the advertisement interval in seconds.
+The acceptable values are 1 to 255.
+The default value is 1.
+.\" The default value is
+.\" .Dv CARP_DFLTINTV .
+.It Cm advskew Ar interval
+Specifies the skew to add to the base advertisement interval to
+make one host advertise slower than another host.
+It is specified in 1/256 of seconds.
+The acceptable values are 1 to 254.
+The default value is 0.
+.It Cm pass Ar phrase
+Set the authentication key to
+.Ar phrase .
+.It Cm vhid Ar n
+Set the virtual host ID.
+This is a required setting.
+Acceptable values are 1 to 255.
+.El
+.Pp
The
.Nm
utility displays the current configuration for a network interface
@@ -1460,6 +1486,7 @@ requested address is unknown, or the use
tried to alter an interface's configuration.
.Sh SEE ALSO
.Xr netstat 1 ,
+.Xr carp 4 ,
.Xr ifmedia 4 ,
.Xr netintro 4 ,
.Xr polling 4 ,
diff --git a/sbin/ifconfig/ifmedia.c b/sbin/ifconfig/ifmedia.c
index 978c79a..7876715 100644
--- a/sbin/ifconfig/ifmedia.c
+++ b/sbin/ifconfig/ifmedia.c
@@ -175,6 +175,12 @@ media_status(int s)
else
printf("no carrier");
break;
+ case IFM_CARP:
+ if (ifmr.ifm_status & IFM_ACTIVE)
+ printf("master");
+ else
+ printf("backup");
+ break;
}
putchar('\n');
}
diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile
index 4b9fcba..53cf3c8 100644
--- a/share/man/man4/Makefile
+++ b/share/man/man4/Makefile
@@ -34,6 +34,7 @@ MAN= aac.4 \
bridge.4 \
bt.4 \
cardbus.4 \
+ carp.4 \
ccd.4 \
cd.4 \
ch.4 \
diff --git a/share/man/man4/carp.4 b/share/man/man4/carp.4
new file mode 100644
index 0000000..1a458a8
--- /dev/null
+++ b/share/man/man4/carp.4
@@ -0,0 +1,263 @@
+.\" $OpenBSD: carp.4,v 1.16 2004/12/07 23:41:35 jmc Exp $
+.\" $FreeBSD: src/share/man/man4/carp.4,v 1.10 2006/06/07 10:26:51 glebius Exp $
+.\" $Id$
+.\"
+.\" Copyright (c) 2003, Ryan McBride. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"
+.Dd April 9, 2007
+.Dt CARP 4
+.Os
+.Sh NAME
+.Nm carp
+.Nd Common Address Redundancy Protocol
+.Sh SYNOPSIS
+.Cd "device carp"
+.Sh DESCRIPTION
+The
+.Nm
+interface is a pseudo-device that implements and controls the
+CARP protocol.
+CARP allows multiple hosts on the same local network to share a set of IP addresses.
+Its primary purpose is to ensure that these
+addresses are always available, but in some configurations
+.Nm
+can also provide load balancing functionality.
+.Pp
+A
+.Nm
+interface can be created at runtime using the
+.Nm ifconfig Li carp Ns Ar N Cm create
+command or by configuring
+it via
+.Va cloned_interfaces
+in the
+.Pa /etc/rc.conf
+file.
+.Pp
+To use
+.Nm ,
+the administrator needs to configure at minimum a common virtual host ID (VHID)
+and virtual host IP address on each machine which is to take part in the virtual
+group.
+Additional parameters can also be set on a per-interface basis:
+.Cm advbase
+and
+.Cm advskew ,
+which are used to control how frequently the host sends advertisements when it
+is the master for a virtual host, and
+.Cm pass
+which is used to authenticate
+.Nm
+advertisements.
+The
+.Cm advbase
+parameter stands for
+.Dq "advertisement base" .
+It is measured in seconds and specifies the base of the advertisement interval.
+The
+.Cm advskew
+parameter stands for
+.Dq "advertisement skew" .
+It is measured in 1/256 of seconds.
+It is added to the base advertisement interval to make one host advertise
+a bit slower that the other does.
+Both
+.Cm advbase
+and
+.Cm advskew
+are put inside CARP advertisements.
+These configurations can be done using
+.Xr ifconfig 8 ,
+or through the
+.Dv SIOCSVH
+.Xr ioctl 2 .
+.Pp
+Additionally, there are a number of global parameters which can be set using
+.Xr sysctl 8 :
+.Bl -tag -width ".Va net.inet.carp.arpbalance"
+.It Va net.inet.carp.allow
+Accept incoming
+.Nm
+packets.
+Enabled by default.
+.It Va net.inet.carp.preempt
+Allow virtual hosts to preempt each other.
+It is also used to failover
+.Nm
+interfaces as a group.
+When the option is enabled and one of the
+.Nm
+enabled physical interfaces
+goes down,
+.Cm advskew
+is changed to 240 on all
+.Nm
+interfaces.
+See also the first example.
+Disabled by default.
+.It Va net.inet.carp.log
+Value of 0 disables any logging.
+Value of 1 enables logging of bad
+.Nm
+packets.
+Values above 1 enable logging state changes of
+.Nm
+interfaces.
+Default value is 1.
+.It Va net.inet.carp.arpbalance
+Balance local traffic using ARP (see below).
+Disabled by default.
+.It Va net.inet.carp.suppress_preempt
+A read only value showing the status of preemption suppression.
+Preemption can be suppressed if link on an interface is down
+or when
+.Xr pfsync 4
+interface is not synchronized.
+Value of 0 means that preemption is not suppressed, since no
+problems are detected.
+Every problem increments suppression counter.
+.El
+.Sh ARP level load balancing
+The
+.Nm
+has limited abilities for load balancing the incoming connections
+between hosts in Ethernet network.
+For load balancing operation, one needs several CARP interfaces that
+are configured to the same IP address, but to a different VHIDs.
+Once an ARP request is received, the CARP protocol will use a hashing
+function against the source IP address in the ARP request to determine
+which VHID should this request belong to.
+If the corresponding CARP interface is in master state, the ARP request
+will be replied, otherwise it will be ignored.
+See the
+.Sx EXAMPLES
+section for a practical example of load balancing.
+.Pp
+The ARP load balancing has some limitations.
+First, ARP balancing only works on the local network segment.
+It cannot balance traffic that crosses a router, because the
+router itself will always be balanced to the same virtual host.
+Second, ARP load balancing can lead to asymmetric routing
+of incoming and outgoing traffic, and thus combining it with
+.Xr pfsync 4
+is dangerous, because this creates a race condition between
+balanced routers and a host they are serving.
+Imagine an incoming packet creating state on the first router, being
+forwarded to its destination, and destination replying faster
+than the state information is packed and synced with the second router.
+If the reply would be load balanced to second router, it will be
+dropped due to no state.
+.Sh EXAMPLES
+For firewalls and routers with multiple interfaces, it is desirable to
+failover all of the
+.Nm
+interfaces together, when one of the physical interfaces goes down.
+This is achieved by the preempt option.
+Enable it on both host A and B:
+.Pp
+.Dl sysctl net.inet.carp.preempt=1
+.Pp
+Assume that host A is the preferred master and 192.168.1.x/24 is
+configured on one physical interface and 192.168.2.y/24 on another.
+This is the setup for host A:
+.Bd -literal -offset indent
+ifconfig carp0 create
+ifconfig carp0 vhid 1 pass mekmitasdigoat 192.168.1.1/24
+ifconfig carp1 create
+ifconfig carp1 vhid 2 pass mekmitasdigoat 192.168.2.1/24
+.Ed
+.Pp
+The setup for host B is identical, but it has a higher
+.Cm advskew :
+.Bd -literal -offset indent
+ifconfig carp0 create
+ifconfig carp0 vhid 1 advskew 100 pass mekmitasdigoat 192.168.1.1/24
+ifconfig carp1 create
+ifconfig carp1 vhid 2 advskew 100 pass mekmitasdigoat 192.168.2.1/24
+.Ed
+.Pp
+Because of the preempt option, when one of the physical interfaces of
+host A fails,
+.Cm advskew
+is adjusted to 240 on all its
+.Nm
+interfaces.
+This will cause host B to preempt on both interfaces instead of
+just the failed one.
+.Pp
+In order to set up an ARP balanced virtual host, it is necessary to configure
+one virtual host for each physical host which would respond to ARP requests
+and thus handle the traffic.
+In the following example, two virtual hosts are configured on two hosts to
+provide balancing and failover for the IP address 192.168.1.10.
+.Pp
+First the
+.Nm
+interfaces on host A are configured.
+The
+.Cm advskew
+of 100 on the second virtual host means that its advertisements will be sent
+out slightly less frequently.
+.Bd -literal -offset indent
+ifconfig carp0 create
+ifconfig carp0 vhid 1 pass mekmitasdigoat 192.168.1.10/24
+ifconfig carp1 create
+ifconfig carp1 vhid 2 advskew 100 pass mekmitasdigoat 192.168.1.10/24
+.Ed
+.Pp
+The configuration for host B is identical, except the
+.Cm advskew
+is on virtual host 1 rather than virtual host 2.
+.Bd -literal -offset indent
+ifconfig carp0 create
+ifconfig carp0 vhid 1 advskew 100 pass mekmitasdigoat 192.168.1.10/24
+ifconfig carp1 create
+ifconfig carp1 vhid 2 pass mekmitasdigoat 192.168.1.10/24
+.Ed
+.Pp
+Finally, the ARP balancing feature must be enabled on both hosts:
+.Pp
+.Dl sysctl net.inet.carp.arpbalance=1
+.Pp
+When the hosts receive an ARP request for 192.168.1.10, the source IP address
+of the request is used to compute which virtual host should answer the request.
+The host which is master of the selected virtual host will reply to the
+request, the other(s) will ignore it.
+.Pp
+This way, locally connected systems will receive different ARP replies and
+subsequent IP traffic will be balanced among the hosts.
+If one of the hosts fails, the other will take over the virtual MAC address,
+and begin answering ARP requests on its behalf.
+.Sh SEE ALSO
+.Xr inet 4 ,
+.Xr pfsync 4 ,
+.Xr rc.conf 5 ,
+.Xr ifconfig 8 ,
+.Xr sysctl 8
+.Sh HISTORY
+The
+.Nm
+device first appeared in
+.Ox 3.5 .
diff --git a/share/man/man4/pfsync.4 b/share/man/man4/pfsync.4
index 349e56e..f518690 100644
--- a/share/man/man4/pfsync.4
+++ b/share/man/man4/pfsync.4
@@ -24,7 +24,7 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd November 29, 2002
+.Dd April 9, 2007
.Dt PFSYNC 4
.Os
.Sh NAME
@@ -129,8 +129,76 @@ only the necessary information.
# ifconfig pfsync0 up syncif fxp0 maxupd 64
# tcpdump -s1500 -evtni pfsync0
.Ed
+.Sh USING PFSYNC WITH CARP
+.Nm
+and
+.Xr carp 4
+can be used together to provide automatic failover of a pair of firewalls
+configured in parallel.
+One firewall handles all traffic \- if it dies or
+is shut down, the second firewall takes over automatically.
+.Pp
+Both firewalls in this example have three
+.Xr sis 4
+interfaces.
+sis0 is the external interface, on the 10.0.0.0/24 subnet; sis1 is the
+internal interface, on the 192.168.0.0/24 subnet; and sis2 is the
+.Nm
+interface, using the 192.168.254.0/24 subnet.
+A crossover cable connects the two firewalls via their sis2 interfaces.
+On all three interfaces, firewall A uses the .254 address, while firewall B
+uses .253.
+The interfaces are configured as follows (firewall A unless otherwise
+indicated):
+.Pp
+Interfaces configuration in
+.Pa /etc/rc.conf :
+.Bd -literal -offset indent
+network_interfaces="lo0 sis0 sis1 sis2"
+cloned_interfaces="carp0 carp1"
+ifconfig_sis0="10.0.0.254/24"
+ifconfig_sis1="192.168.0.254/24"
+ifconfig_sis2="192.168.254.254/24"
+ifconfig_carp0="vhid 1 pass foo 10.0.0.1/24"
+ifconfig_carp1="vhid 2 pass bar 192.168.0.1/24"
+pfsync_enable="YES"
+pfsync_syncdev="sis2"
+.Ed
+.Pp
+.Xr pf 4
+must also be configured to allow
+.Nm
+and
+.Xr carp 4
+traffic through.
+The following should be added to the top of
+.Pa /etc/pf.conf :
+.Bd -literal -offset indent
+pass quick on { sis2 } proto pfsync
+pass quick on { sis0 sis1 } proto carp keep state
+.Ed
+.Pp
+If it is preferable that one firewall handle the traffic,
+the
+.Ar advskew
+on the backup firewall's
+.Xr carp 4
+interfaces should be set to something higher than
+the primary's.
+For example, if firewall B is the backup, its
+carp1 configuration would look like this:
+.Bd -literal -offset indent
+ifconfig_carp1="vhid 2 pass bar advskew 100 192.168.0.1/24"
+.Ed
+.Pp
+The following must also be added to
+.Pa /etc/sysctl.conf :
+.Bd -literal -offset indent
+net.inet.carp.preempt=1
+.Ed
.Sh SEE ALSO
.Xr tcpdump 1 ,
+.Xr carp 4 ,
.Xr bpf 4 ,
.Xr inet 4 ,
.Xr inet6 4 ,
diff --git a/sys/conf/files b/sys/conf/files
index 92cd5b7..5222fe3 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -79,6 +79,7 @@ crypto/des/des_setkey.c optional ipsec
crypto/rijndael/rijndael-alg-fst.c optional ipsec ipsec_esp
crypto/rijndael/rijndael-api-fst.c optional ipsec ipsec_esp
crypto/sha1.c optional ipsec
+crypto/sha1.c optional carp
crypto/sha2/sha2.c optional ipsec
ddb/db_access.c optional ddb
ddb/db_kld.c optional ddb
@@ -887,6 +888,7 @@ netinet/in_gif.c optional gif inet
netinet/igmp.c optional inet
netinet/in.c optional inet
netinet/in_cksum.c optional inet
+netinet/ip_carp.c optional carp
netinet/ip_gre.c optional gre inet
netinet/ip_id.c optional inet
netinet/in_pcb.c optional inet
diff --git a/sys/conf/options b/sys/conf/options
index 184ec98..bfeaaef 100644
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -264,6 +264,7 @@ BOOTP_COMPAT opt_bootp.h
BOOTP_NFSROOT opt_bootp.h
BOOTP_NFSV3 opt_bootp.h
BOOTP_WIRED_TO opt_bootp.h
+CARP opt_carp.h
ETHER_II opt_ef.h
ETHER_8023 opt_ef.h
ETHER_8022 opt_ef.h
diff --git a/sys/config/LINT b/sys/config/LINT
index 58721c7..92bc5ad 100644
--- a/sys/config/LINT
+++ b/sys/config/LINT
@@ -633,6 +633,10 @@ device pf
device pfsync
device pflog
+#CARP
+pseudo-device carp
+options CARP
+
# The MBUF_STRESS_TEST option enables options which create
# various random failures / extreme cases related to mbuf
# functions. See the mbuf(9) manpage for a list of available
diff --git a/sys/config/VKERNEL b/sys/config/VKERNEL
index 6f2cfb6..151f2c8 100644
--- a/sys/config/VKERNEL
+++ b/sys/config/VKERNEL
@@ -73,6 +73,8 @@ options DDB
options DDB_TRACE
options INVARIANTS
+options CARP
+
# Floating point support - do not disable.
device npx0 at nexus?
@@ -87,6 +89,8 @@ pseudo-device md # Memory "disks"
pseudo-device gif # IPv6 and IPv4 tunneling
pseudo-device faith 1 # IPv6-to-IPv4 relaying (translation)
+pseudo-device carp
+
# The `bpf' pseudo-device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
pseudo-device bpf #Berkeley packet filter
@@ -96,3 +100,4 @@ pseudo-device bpf #Berkeley packet filt
device vn
device vkd
device vke
+
diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
index d08ae24..7ed3ca4 100644
--- a/sys/net/if_ethersubr.c
+++ b/sys/net/if_ethersubr.c
@@ -40,6 +40,7 @@
#include "opt_inet6.h"
#include "opt_ipx.h"
#include "opt_netgraph.h"
+#include "opt_carp.h"
#include <sys/param.h>
#include <sys/systm.h>
@@ -71,6 +72,10 @@
#include <netinet6/nd6.h>
#endif
+#ifdef CARP
+#include <netinet/ip_carp.h>
+#endif
+
#ifdef IPX
#include <netproto/ipx/ipx.h>
#include <netproto/ipx/ipx_if.h>
@@ -346,6 +351,12 @@ ether_output(struct ifnet *ifp, struct m
}
}
+#ifdef CARP
+ if (ifp->if_carp && (error = carp_output(ifp, m, dst, NULL)))
+ goto bad;
+#endif
+
+
/* Handle ng_ether(4) processing, if any */
if (ng_ether_output_p != NULL) {
if ((error = (*ng_ether_output_p)(ifp, &m)) != 0)
@@ -654,6 +665,20 @@ ether_demux(struct ifnet *ifp, struct et
if (rule) /* packet is passing the second time */
goto post_stats;
+#ifdef CARP
+ /*
+ * XXX: Okay, we need to call carp_forus() and - if it is for
+ * us jump over code that does the normal check
+ * "ac_enaddr == ether_dhost". The check sequence is a bit
+ * different from OpenBSD, so we jump over as few code as
+ * possible, to catch _all_ sanity checks. This needs
+ * evaluation, to see if the carp ether_dhost values break any
+ * of these checks!
+ */
+ if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost))
+ goto pre_stats;
+#endif
+
/*
* Discard packet if upper layers shouldn't see it because
* it was unicast to a different Ethernet address. If the
@@ -666,6 +691,11 @@ ether_demux(struct ifnet *ifp, struct et
m_freem(m);
return;
}
+
+#ifdef CARP
+pre_stats:
+#endif
+
/* Discard packet if interface is not up */
if (!(ifp->if_flags & IFF_UP)) {
m_freem(m);
diff --git a/sys/net/if_media.h b/sys/net/if_media.h
index cac9959..1dec5f6 100644
--- a/sys/net/if_media.h
+++ b/sys/net/if_media.h
@@ -239,6 +239,11 @@ int ifmedia_baudrate(int);
#define IFM_ATM_UNASSIGNED 0x00000400 /* unassigned cells */
/*
+ * CARP Common Address Redundancy Protocol
+ */
+#define IFM_CARP 0x000000c0
+
+/*
* Shared media sub-types
*/
#define IFM_AUTO 0 /* Autoselect best media */
@@ -316,6 +321,7 @@ struct ifmedia_description {
{ IFM_TOKEN, "Token ring" }, \
{ IFM_FDDI, "FDDI" }, \
{ IFM_IEEE80211, "IEEE 802.11 Wireless Ethernet" }, \
+ { IFM_CARP, "Common Address Redundancy Protocol" }, \
{ 0, NULL }, \
}
diff --git a/sys/net/if_types.h b/sys/net/if_types.h
index d2e6742..4039b0d 100644
--- a/sys/net/if_types.h
+++ b/sys/net/if_types.h
@@ -252,4 +252,5 @@
#define IFT_STF 0xf3
#define IFT_PFLOG 0xf5 /* Packet filter logging */
#define IFT_PFSYNC 0xf6 /* Packet filter state syncing */
+#define IFT_CARP 0xf8 /* Common Address Redundancy Protocol */
#endif /* !_NET_IF_TYPES_H_ */
diff --git a/sys/net/if_var.h b/sys/net/if_var.h
index 8dc1e40..1436a72 100644
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -81,6 +81,7 @@ struct rtentry;
struct rt_addrinfo;
struct socket;
struct ether_header;
+struct carp_if;
struct ucred;
struct lwkt_serialize;
@@ -178,6 +179,7 @@ struct ifnet {
int if_dunit; /* unit or IF_DUNIT_NONE */
struct ifaddrhead if_addrhead; /* linked list of addresses per if */
int if_pcount; /* number of promiscuous listeners */
+ struct carp_if *if_carp; /* carp interface structure */
struct bpf_if *if_bpf; /* packet filter structure */
u_short if_index; /* numeric abbreviation for this if */
short if_timer; /* time 'til if_watchdog called */
diff --git a/sys/netinet/if_ether.c b/sys/netinet/if_ether.c
index b5c3410..1b7fc53 100644
--- a/sys/netinet/if_ether.c
+++ b/sys/netinet/if_ether.c
@@ -74,6 +74,7 @@
*/
#include "opt_inet.h"
+#include "opt_carp.h"
#include <sys/param.h>
#include <sys/kernel.h>
@@ -102,6 +103,10 @@
#include <net/if_arc.h>
#include <net/iso88025.h>
+#ifdef CARP
+#include <netinet/ip_carp.h>
+#endif
+
#define SIN(s) ((struct sockaddr_in *)s)
#define SDL(s) ((struct sockaddr_dl *)s)
@@ -143,6 +148,7 @@ SYSCTL_INT(_net_link_ether_inet, OID_AUT
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_RW,
&arp_proxyall, 0, "");
+void arprequest_acces(struct ifnet *ifp, struct in_addr *sip, struct in_addr *tip, u_char *enaddr);
static void arp_rtrequest (int, struct rtentry *, struct rt_addrinfo *);
static void arprequest (struct ifnet *,
struct in_addr *, struct in_addr *, u_char *);
@@ -736,6 +742,7 @@ in_arpinput(struct mbuf *m)
#ifdef SMP
struct netmsg_arp_update msg;
#endif
+ u_int8_t *enaddr = NULL;
int op;
int req_len;
@@ -770,6 +777,19 @@ in_arpinput(struct mbuf *m)
if (ifp->if_bridge && ia->ia_ifp &&
ifp->if_bridge == ia->ia_ifp->if_bridge)
+
+#ifdef CARP
+ /*
+ * If the interface does not match, but the recieving interface
+ * is part of carp, we call carp_iamatch to see if this is a
+ * request for the virtual host ip.
+ * XXX: This is really ugly!
+ */
+ if (ifp->if_carp != NULL &&
+ carp_iamatch(ifp->if_carp, ia, &isaddr, &enaddr) &&
+ itaddr.s_addr == ia->ia_addr.sin_addr.s_addr)
+ goto match;
+#endif
}
LIST_FOREACH(ia, INADDR_HASH(isaddr.s_addr), ia_hash) {
/* Skip all ia's which don't match */
@@ -801,8 +821,10 @@ in_arpinput(struct mbuf *m)
return;
match:
+ if (!enaddr)
+ enaddr = (u_int8_t *)IF_LLADDR(ifp);
myaddr = ia->ia_addr.sin_addr;
- if (!bcmp(ar_sha(ah), IF_LLADDR(ifp), ifp->if_addrlen)) {
+ if (!bcmp(ar_sha(ah), enaddr, ifp->if_addrlen)) {
m_freem(m); /* it's from me, ignore it. */
return;
}
@@ -839,7 +861,7 @@ reply:
if (itaddr.s_addr == myaddr.s_addr) {
/* I am the target */
memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
- memcpy(ar_sha(ah), IF_LLADDR(ifp), ah->ar_hln);
+ memcpy(ar_sha(ah), enaddr, ah->ar_hln);
} else {
struct llinfo_arp *la;
@@ -873,7 +895,7 @@ reply:
return;
}
memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
- memcpy(ar_sha(ah), IF_LLADDR(ifp), ah->ar_hln);
+ memcpy(ar_sha(ah), enaddr, ah->ar_hln);
#ifdef DEBUG_PROXY
kprintf("arp: proxying for %s\n", inet_ntoa(itaddr));
#endif
@@ -1039,6 +1061,16 @@ arp_ifinit(struct ifnet *ifp, struct ifa
ifa->ifa_flags |= RTF_CLONING;
}
+void
+arp_ifinit2(struct ifnet *ifp, struct ifaddr *ifa, u_char *enaddr)
+{
+ if (IA_SIN(ifa)->sin_addr.s_addr != INADDR_ANY)
+ arprequest(ifp, &IA_SIN(ifa)->sin_addr, &IA_SIN(ifa)->sin_addr,
+ enaddr);
+ ifa->ifa_rtrequest = arp_rtrequest;
+ ifa->ifa_flags |= RTF_CLONING;
+}
+
static void
arp_init(void)
{
diff --git a/sys/netinet/if_ether.h b/sys/netinet/if_ether.h
index 6a2a65a..97dce14 100644
--- a/sys/netinet/if_ether.h
+++ b/sys/netinet/if_ether.h
@@ -124,6 +124,7 @@ extern u_char ether_ipmulticast_max[ETHE
int arpresolve (struct ifnet *, struct rtentry *, struct mbuf *,
struct sockaddr *, u_char *);
void arp_ifinit (struct ifnet *, struct ifaddr *);
+void arp_ifinit2 (struct ifnet *, struct ifaddr *, u_char *);
#endif
#endif
diff --git a/sys/netinet/in.h b/sys/netinet/in.h
index c867488..5cdedfb 100644
--- a/sys/netinet/in.h
+++ b/sys/netinet/in.h
@@ -169,6 +169,7 @@
#define IPPROTO_IPCOMP 108 /* payload compression (IPComp) */
/* 101-254: Partly Unassigned */
#define IPPROTO_PIM 103 /* Protocol Independent Mcast */
+#define IPPROTO_CARP 112 /* CARP */
#define IPPROTO_PGM 113 /* PGM */
#define IPPROTO_SCTP 132 /* SCTP */
#define IPPROTO_PFSYNC 240 /* PFSYNC */
@@ -297,6 +298,7 @@ struct in_addr {
#define INADDR_UNSPEC_GROUP (u_int32_t)0xe0000000 /* 224.0.0.0 */
#define INADDR_ALLHOSTS_GROUP (u_int32_t)0xe0000001 /* 224.0.0.1 */
#define INADDR_ALLRTRS_GROUP (u_int32_t)0xe0000002 /* 224.0.0.2 */
+#define INADDR_CARP_GROUP (u_int32_t)0xe0000012 /* 224.0.0.18 */
#define INADDR_PFSYNC_GROUP (u_int32_t)0xe00000f0 /* 224.0.0.240 */
#define INADDR_MAX_LOCAL_GROUP (u_int32_t)0xe00000ff /* 224.0.0.255 */
diff --git a/sys/netinet/in_proto.c b/sys/netinet/in_proto.c
index ab5bfca..5babd61 100644
--- a/sys/netinet/in_proto.c
+++ b/sys/netinet/in_proto.c
@@ -41,6 +41,7 @@
#include "opt_ipsec.h"
#include "opt_inet6.h"
#include "opt_sctp.h"
+#include "opt_carp.h"
#include <sys/param.h>
#include <sys/kernel.h>
@@ -105,6 +106,10 @@
#include <net/netisr.h> /* for cpu0_soport */
+#ifdef CARP
+#include <netinet/ip_carp.h>
+#endif
+
extern struct domain inetdomain;
static struct pr_usrreqs nousrreqs;
@@ -294,6 +299,16 @@ struct protosw inetsw[] = {
rip_init, 0, 0, 0,
&rip_usrreqs
},
+
+#ifdef CARP
+ { SOCK_RAW, &inetdomain, IPPROTO_CARP, PR_ATOMIC|PR_ADDR,
+ carp_input, rip_output, 0, rip_ctloutput,
+ 0,
+ 0, 0, 0, 0,
+ &rip_usrreqs
+},
+
+#endif
};
struct domain inetdomain = {
@@ -332,3 +347,6 @@ SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, d
#ifdef PIM
SYSCTL_NODE(_net_inet, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
#endif
+#ifdef CARP
+SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW, 0, "CARP");
+#endif
diff --git a/sys/netinet/ip_carp.c b/sys/netinet/ip_carp.c
new file mode 100644
index 0000000..00a40c4
--- /dev/null
+++ b/sys/netinet/ip_carp.c
@@ -0,0 +1,2215 @@
+/* $Id$ */
+/* from $FreeBSD: src/sys/netinet/ip_carp.c,v 1.48 2007/02/02 09:39:09 glebius Exp $ */
+
+/*
+ * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
+ * Copyright (c) 2003 Ryan McBride. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "opt_carp.h"
+/*#include "opt_bpf.h"*/
+#include "opt_inet.h"
+#include "opt_inet6.h"
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/kernel.h>
+#include <machine/limits.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/module.h>
+#include <sys/time.h>
+#include <sys/proc.h>
+#include <sys/sysctl.h>
+#include <sys/syslog.h>
+#include <sys/signalvar.h>
+#include <sys/filio.h>
+#include <sys/sockio.h>
+#include <sys/in_cksum.h>
+#include <sys/socket.h>
+#include <sys/vnode.h>
+
+#include <machine/stdarg.h>
+
+#include <net/bpf.h>
+#include <net/ethernet.h>
+#include <net/iso88025.h>
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/route.h>
+
+#ifdef INET
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/if_ether.h>
+#include <netinet/if_fddi.h>
+#endif
+
+#ifdef INET6
+#include <netinet/icmp6.h>
+#include <netinet/ip6.h>
+#include <netinet6/ip6_var.h>
+#include <netinet6/scope6_var.h>
+#include <netinet6/nd6.h>
+#endif
+
+#include <crypto/sha1.h>
+#include <netinet/ip_carp.h>
+#include <sys/lock.h>
+
+#define CARP_IFNAME "carp"
+static MALLOC_DEFINE(M_CARP, "CARP", "CARP interfaces");
+static MALLOC_DEFINE(M_IFNET, "IFNET", "IFNET CARP?");
+SYSCTL_DECL(_net_inet_carp);
+
+struct carp_softc {
+ struct ifnet *sc_ifp; /* Interface clue */
+ struct ifnet *sc_carpdev; /* Pointer to parent interface */
+ struct in_ifaddr *sc_ia; /* primary iface address */
+ struct ip_moptions sc_imo;
+#ifdef INET6
+ struct in6_ifaddr *sc_ia6; /* primary iface address v6 */
+ struct ip6_moptions sc_im6o;
+#endif /* INET6 */
+ TAILQ_ENTRY(carp_softc) sc_list;
+
+ enum { INIT = 0, BACKUP, MASTER } sc_state;
+
+ int sc_flags_backup;
+ int sc_suppress;
+
+ int sc_sendad_errors;
+#define CARP_SENDAD_MAX_ERRORS 3
+ int sc_sendad_success;
+#define CARP_SENDAD_MIN_SUCCESS 3
+
+ int sc_vhid;
+ int sc_advskew;
+ int sc_naddrs;
+ int sc_naddrs6;
+ int sc_advbase; /* seconds */
+ int sc_init_counter;
+ u_int64_t sc_counter;
+
+ /* authentication */
+#define CARP_HMAC_PAD 64
+ unsigned char sc_key[CARP_KEY_LEN];
+ unsigned char sc_pad[CARP_HMAC_PAD];
+ SHA1_CTX sc_sha1;
+
+ struct callout sc_ad_tmo; /* advertisement timeout */
+ struct callout sc_md_tmo; /* master down timeout */
+ struct callout sc_md6_tmo; /* master down timeout */
+
+ LIST_ENTRY(carp_softc) sc_next; /* Interface clue */
+};
+#define SC2IFP(sc) ((sc)->sc_ifp)
+
+int carp_suppress_preempt = 0;
+int carp_opts[CARPCTL_MAXID] = { 0, 1, 0, 1, 0, 0 }; /* XXX for now */
+SYSCTL_INT(_net_inet_carp, CARPCTL_ALLOW, allow, CTLFLAG_RW,
+ &carp_opts[CARPCTL_ALLOW], 0, "Accept incoming CARP packets");
+SYSCTL_INT(_net_inet_carp, CARPCTL_PREEMPT, preempt, CTLFLAG_RW,
+ &carp_opts[CARPCTL_PREEMPT], 0, "high-priority backup preemption mode");
+SYSCTL_INT(_net_inet_carp, CARPCTL_LOG, log, CTLFLAG_RW,
+ &carp_opts[CARPCTL_LOG], 0, "log bad carp packets");
+SYSCTL_INT(_net_inet_carp, CARPCTL_ARPBALANCE, arpbalance, CTLFLAG_RW,
+ &carp_opts[CARPCTL_ARPBALANCE], 0, "balance arp responses");
+SYSCTL_INT(_net_inet_carp, OID_AUTO, suppress_preempt, CTLFLAG_RD,
+ &carp_suppress_preempt, 0, "Preemption is suppressed");
+
+struct carpstats carpstats;
+SYSCTL_STRUCT(_net_inet_carp, CARPCTL_STATS, stats, CTLFLAG_RW,
+ &carpstats, carpstats,
+ "CARP statistics (struct carpstats, netinet/ip_carp.h)");
+
+struct carp_if {
+ TAILQ_HEAD(, carp_softc) vhif_vrs;
+ int vhif_nvrs;
+
+ struct ifnet *vhif_ifp;
+ struct lock vhif_lock;
+};
+
+/* Get carp_if from softc. Valid after carp_set_addr{,6}. */
+#define SC2CIF(sc) ((struct carp_if *)(sc)->sc_carpdev->if_carp)
+
+#define CARP_LOCK_INIT(cif) lockinit(&(cif)->vhif_lock, "carp_if", 0, LK_NOWAIT);
+#define CARP_LOCK_DESTROY(cif) ;
+#define CARP_LOCK_ASSERT(cif) ;
+#define CARP_LOCK(cif) lockmgr(&(cif)->vhif_lock, LK_EXCLUSIVE);
+#define CARP_UNLOCK(cif) lockmgr(&(cif)->vhif_lock, LK_RELEASE);
+
+#define CARP_SCLOCK(sc) lockmgr(&SC2CIF(sc)->vhif_lock, LK_EXCLUSIVE);
+#define CARP_SCUNLOCK(sc) lockmgr(&SC2CIF(sc)->vhif_lock, LK_RELEASE);
+#define CARP_SCLOCK_ASSERT(sc) ;
+
+#define CARP_LOG(...) do { \
+ if (carp_opts[CARPCTL_LOG] > 0) \
+ log(LOG_INFO, __VA_ARGS__); \
+} while (0)
+
+#define CARP_DEBUG(...) do { \
+ if (carp_opts[CARPCTL_LOG] > 1) \
+ log(LOG_DEBUG, __VA_ARGS__); \
+} while (0)
+
+static void carp_hmac_prepare(struct carp_softc *);
+static void carp_hmac_generate(struct carp_softc *, u_int32_t *,
+ unsigned char *);
+static int carp_hmac_verify(struct carp_softc *, u_int32_t *,
+ unsigned char *);
+static void carp_setroute(struct carp_softc *, int);
+static void carp_input_c(struct mbuf *, struct carp_header *, sa_family_t);
+static int carp_clone_create(struct if_clone *, int);
+static void carp_clone_destroy(struct ifnet *);
+static void carpdetach(struct carp_softc *, int);
+static int carp_prepare_ad(struct mbuf *, struct carp_softc *,
+ struct carp_header *);
+static void carp_send_ad_all(void);
+static void carp_send_ad(void *);
+static void carp_send_ad_locked(struct carp_softc *);
+static void carp_send_arp(struct carp_softc *);
+static void carp_master_down(void *);
+static void carp_master_down_locked(struct carp_softc *);
+static int carp_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
+static int carp_looutput(struct ifnet *, struct mbuf *, struct sockaddr *,
+ struct rtentry *);
+static void carp_start(struct ifnet *);
+static void carp_setrun(struct carp_softc *, sa_family_t);
+static void carp_set_state(struct carp_softc *, int);
+static int carp_addrcount(struct carp_if *, struct in_ifaddr *, int);
+enum { CARP_COUNT_MASTER, CARP_COUNT_RUNNING };
+
+static void carp_multicast_cleanup(struct carp_softc *);
+static int carp_set_addr(struct carp_softc *, struct sockaddr_in *);
+static int carp_del_addr(struct carp_softc *, struct sockaddr_in *);
+static void carp_carpdev_state_locked(struct carp_if *);
+static void carp_sc_state_locked(struct carp_softc *);
+#ifdef INET6
+static void carp_send_na(struct carp_softc *);
+static int carp_set_addr6(struct carp_softc *, struct sockaddr_in6 *);
+static int carp_del_addr6(struct carp_softc *, struct sockaddr_in6 *);
+static void carp_multicast6_cleanup(struct carp_softc *);
+#endif
+
+static LIST_HEAD(, carp_softc) carpif_list;
+
+struct if_clone carp_cloner = IF_CLONE_INITIALIZER(CARP_IFNAME, carp_clone_create, carp_clone_destroy, 0, IF_MAXUNIT);
+
+static eventhandler_tag if_detach_event_tag;
+
+static __inline u_int16_t
+carp_cksum(struct mbuf *m, int len)
+{
+ return (in_cksum(m, len));
+}
+
+static void
+carp_hmac_prepare(struct carp_softc *sc)
+{
+ u_int8_t version = CARP_VERSION, type = CARP_ADVERTISEMENT;
+ u_int8_t vhid = sc->sc_vhid & 0xff;
+ struct ifaddr *ifa;
+ int i;
+#ifdef INET6
+ struct in6_addr in6;
+#endif
+
+ if (sc->sc_carpdev)
+ CARP_SCLOCK(sc);
+
+ /* XXX: possible race here */
+
+ /* compute ipad from key */
+ bzero(sc->sc_pad, sizeof(sc->sc_pad));
+ bcopy(sc->sc_key, sc->sc_pad, sizeof(sc->sc_key));
+ for (i = 0; i < sizeof(sc->sc_pad); i++)
+ sc->sc_pad[i] ^= 0x36;
+
+ /* precompute first part of inner hash */
+ SHA1Init(&sc->sc_sha1);
+ SHA1Update(&sc->sc_sha1, sc->sc_pad, sizeof(sc->sc_pad));
+ SHA1Update(&sc->sc_sha1, (void *)&version, sizeof(version));
+ SHA1Update(&sc->sc_sha1, (void *)&type, sizeof(type));
+ SHA1Update(&sc->sc_sha1, (void *)&vhid, sizeof(vhid));
+#ifdef INET
+ TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
+ if (ifa->ifa_addr->sa_family == AF_INET)
+ SHA1Update(&sc->sc_sha1,
+ (void *)&ifatoia(ifa)->ia_addr.sin_addr.s_addr,
+ sizeof(struct in_addr));
+ }
+#endif /* INET */
+#ifdef INET6
+ TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
+ if (ifa->ifa_addr->sa_family == AF_INET6) {
+ in6 = ifatoia6(ifa)->ia_addr.sin6_addr;
+ in6_clearscope(&in6);
+ SHA1Update(&sc->sc_sha1, (void *)&in6, sizeof(in6));
+ }
+ }
+#endif /* INET6 */
+
+ /* convert ipad to opad */
+ for (i = 0; i < sizeof(sc->sc_pad); i++)
+ sc->sc_pad[i] ^= 0x36 ^ 0x5c;
+
+ if (sc->sc_carpdev)
+ CARP_SCUNLOCK(sc);
+}
+
+static void
+carp_hmac_generate(struct carp_softc *sc, u_int32_t counter[2],
+ unsigned char md[20])
+{
+ SHA1_CTX sha1ctx;
+
+ /* fetch first half of inner hash */
+ bcopy(&sc->sc_sha1, &sha1ctx, sizeof(sha1ctx));
+
+ SHA1Update(&sha1ctx, (void *)counter, sizeof(sc->sc_counter));
+ SHA1Final(md, &sha1ctx);
+
+ /* outer hash */
+ SHA1Init(&sha1ctx);
+ SHA1Update(&sha1ctx, sc->sc_pad, sizeof(sc->sc_pad));
+ SHA1Update(&sha1ctx, md, 20);
+ SHA1Final(md, &sha1ctx);
+}
+
+static int
+carp_hmac_verify(struct carp_softc *sc, u_int32_t counter[2],
+ unsigned char md[20])
+{
+ unsigned char md2[20];
+
+ CARP_SCLOCK_ASSERT(sc);
+
+ carp_hmac_generate(sc, counter, md2);
+
+ return (bcmp(md, md2, sizeof(md2)));
+}
+
+static void
+carp_setroute(struct carp_softc *sc, int cmd)
+{
+ struct ifaddr *ifa;
+
+ if (sc->sc_carpdev)
+ CARP_SCLOCK_ASSERT(sc);
+
+ crit_enter();
+ TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
+ if (ifa->ifa_addr->sa_family == AF_INET &&
+ sc->sc_carpdev != NULL) {
+ int count = carp_addrcount(
+ (struct carp_if *)sc->sc_carpdev->if_carp,
+ ifatoia(ifa), CARP_COUNT_MASTER);
+
+ if ((cmd == RTM_ADD && count == 1) ||
+ (cmd == RTM_DELETE && count == 0))
+ rtinit(ifa, cmd, RTF_UP | RTF_HOST);
+ }
+#ifdef INET6
+ if (ifa->ifa_addr->sa_family == AF_INET6) {
+ if (cmd == RTM_ADD)
+ in6_ifaddloop(ifa);
+ else
+ in6_ifremloop(ifa);
+ }
+#endif /* INET6 */
+ }
+ crit_exit();
+
+}
+
+static int
+carp_clone_create(struct if_clone *ifc, int unit)
+{
+
+ struct carp_softc *sc;
+ struct ifnet *ifp;
+
+ MALLOC(sc, struct carp_softc *, sizeof(*sc), M_CARP, M_WAITOK|M_ZERO);
+ ifp = SC2IFP(sc) = kmalloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO);
+
+ if (ifp == NULL) {
+ FREE(sc, M_CARP);
+ return (ENOSPC);
+ }
+
+ sc->sc_flags_backup = 0;
+ sc->sc_suppress = 0;
+ sc->sc_advbase = CARP_DFLTINTV;
+ sc->sc_vhid = -1; /* required setting */
+ sc->sc_advskew = 0;
+ sc->sc_init_counter = 1;
+ sc->sc_naddrs = sc->sc_naddrs6 = 0; /* M_ZERO? */
+
+#ifdef INET6
+ sc->sc_im6o.im6o_multicast_hlim = CARP_DFLTTL;
+#endif
+
+/* sc->sc_imo.imo_membership = kmalloc((sizeof(struct in_multi) * IP_MAX_MEMBERSHIPS), M_CARP,M_WAITOK);*/
+/*
+ sc->sc_imo.imo_max_memberships = IP_MAX_MEMBERSHIPS;
+ sc->sc_imo.imo_multicast_vif = -1;
+*/
+ callout_init(&sc->sc_ad_tmo);
+ callout_init(&sc->sc_md_tmo);
+ callout_init(&sc->sc_md6_tmo);
+
+ ifp->if_softc = sc;
+ if_initname(ifp, CARP_IFNAME, unit);
+ ifp->if_mtu = ETHERMTU;
+ ifp->if_flags = IFF_LOOPBACK;
+ ifp->if_ioctl = carp_ioctl;
+ ifp->if_output = carp_looutput;
+ ifp->if_start = carp_start;
+ ifp->if_type = IFT_CARP;
+ ifp->if_snd.ifq_maxlen = ifqmaxlen;
+ ifp->if_hdrlen = 0;
+ if_attach(ifp, NULL);
+ bpfattach(ifp, DLT_NULL, sizeof(u_int));
+
+ crit_enter();
+ LIST_INSERT_HEAD(&carpif_list, sc, sc_next);
+ crit_exit();
+
+ return (0);
+}
+
+static void
+carp_clone_destroy(struct ifnet *ifp)
+{
+ struct carp_softc *sc = ifp->if_softc;
+
+ if (sc->sc_carpdev)
+ CARP_SCLOCK(sc);
+ carpdetach(sc, 1); /* Returns unlocked. */
+
+ crit_enter();
+ LIST_REMOVE(sc, sc_next);
+ crit_exit();
+ bpfdetach(ifp);
+ if_detach(ifp);
+/* if_free_type(ifp, IFT_ETHER);*/
+/* kfree(sc->sc_imo.imo_membership, M_CARP); */
+ kfree(sc, M_CARP);
+}
+
+/*
+ * This function can be called on CARP interface destroy path,
+ * and in case of the removal of the underlying interface as
+ * well. We differentiate these two cases. In the latter case
+ * we do not cleanup our multicast memberships, since they
+ * are already freed. Also, in the latter case we do not
+ * release the lock on return, because the function will be
+ * called once more, for another CARP instance on the same
+ * interface.
+ */
+static void
+carpdetach(struct carp_softc *sc, int unlock)
+{
+ struct carp_if *cif;
+
+ callout_stop(&sc->sc_ad_tmo);
+ callout_stop(&sc->sc_md_tmo);
+ callout_stop(&sc->sc_md6_tmo);
+
+ if (sc->sc_suppress)
+ carp_suppress_preempt--;
+ sc->sc_suppress = 0;
+
+ if (sc->sc_sendad_errors >= CARP_SENDAD_MAX_ERRORS)
+ carp_suppress_preempt--;
+ sc->sc_sendad_errors = 0;
+
+ carp_set_state(sc, INIT);
+ SC2IFP(sc)->if_flags &= ~IFF_UP;
+ carp_setrun(sc, 0);
+ if (unlock)
+ carp_multicast_cleanup(sc);
+#ifdef INET6
+ carp_multicast6_cleanup(sc);
+#endif
+
+ if (sc->sc_carpdev != NULL) {
+ cif = (struct carp_if *)sc->sc_carpdev->if_carp;
+ CARP_LOCK_ASSERT(cif);
+ TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
+ if (!--cif->vhif_nvrs) {
+ ifpromisc(sc->sc_carpdev, 0);
+ sc->sc_carpdev->if_carp = NULL;
+ CARP_LOCK_DESTROY(cif);
+ FREE(cif, M_IFADDR);
+ } else if (unlock)
+ CARP_UNLOCK(cif);
+ sc->sc_carpdev = NULL;
+ }
+}
+
+/* Detach an interface from the carp. */
+static void
+carp_ifdetach(void *arg __unused, struct ifnet *ifp)
+{
+ struct carp_if *cif = (struct carp_if *)ifp->if_carp;
+ struct carp_softc *sc, *nextsc;
+
+ if (cif == NULL)
+ return;
+
+ /*
+ * XXX: At the end of for() cycle the lock will be destroyed.
+ */
+ CARP_LOCK(cif);
+ for (sc = TAILQ_FIRST(&cif->vhif_vrs); sc; sc = nextsc) {
+ nextsc = TAILQ_NEXT(sc, sc_list);
+ carpdetach(sc, 0);
+ }
+ CARP_UNLOCK(cif);
+}
+
+/*
+ * process input packet.
+ * we have rearranged checks order compared to the rfc,
+ * but it seems more efficient this way or not possible otherwise.
+ */
+void
+carp_input(struct mbuf *m, int hlen)
+{
+ struct ip *ip = mtod(m, struct ip *);
+ struct carp_header *ch;
+ int iplen, len;
+
+ carpstats.carps_ipackets++;
+
+ if (!carp_opts[CARPCTL_ALLOW]) {
+ m_freem(m);
+ return;
+ }
+
+ /* check if received on a valid carp interface */
+ if (m->m_pkthdr.rcvif->if_carp == NULL) {
+ carpstats.carps_badif++;
+ CARP_LOG("carp_input: packet received on non-carp "
+ "interface: %s\n",
+ m->m_pkthdr.rcvif->if_xname);
+ m_freem(m);
+ return;
+ }
+
+ /* verify that the IP TTL is 255. */
+ if (ip->ip_ttl != CARP_DFLTTL) {
+ carpstats.carps_badttl++;
+ CARP_LOG("carp_input: received ttl %d != 255i on %s\n",
+ 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.carps_badlen++;
+ CARP_LOG("carp_input: received len %zd < "
+ "sizeof(struct carp_header)\n",
+ m->m_len - sizeof(struct ip));
+ m_freem(m);
+ return;
+ }
+
+ if (iplen + sizeof(*ch) < m->m_len) {
+ if ((m = m_pullup(m, iplen + sizeof(*ch))) == NULL) {
+ carpstats.carps_hdrops++;
+ CARP_LOG("carp_input: pullup failed\n");
+ 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.carps_badlen++;
+ CARP_LOG("carp_input: packet too short %d on %s\n",
+ m->m_pkthdr.len,
+ m->m_pkthdr.rcvif->if_xname);
+ m_freem(m);
+ return;
+ }
+
+ if ((m = m_pullup(m, len)) == NULL) {
+ carpstats.carps_hdrops++;
+ return;
+ }
+ ip = mtod(m, struct ip *);
+ ch = (struct carp_header *)((char *)ip + iplen);
+
+ /* verify the CARP checksum */
+ m->m_data += iplen;
+ if (carp_cksum(m, len - iplen)) {
+ carpstats.carps_badsum++;
+ CARP_LOG("carp_input: checksum failed on %s\n",
+ m->m_pkthdr.rcvif->if_xname);
+ m_freem(m);
+ return;
+ }
+ m->m_data -= iplen;
+
+ carp_input_c(m, ch, AF_INET);
+}
+
+#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.carps_ipackets6++;
+
+ if (!carp_opts[CARPCTL_ALLOW]) {
+ m_freem(m);
+ return (IPPROTO_DONE);
+ }
+
+ /* check if received on a valid carp interface */
+ if (m->m_pkthdr.rcvif->if_carp == NULL) {
+ carpstats.carps_badif++;
+ CARP_LOG("carp6_input: packet received on non-carp "
+ "interface: %s\n",
+ 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.carps_badttl++;
+ CARP_LOG("carp6_input: received ttl %d != 255 on %s\n",
+ 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.carps_badlen++;
+ CARP_LOG("carp6_input: packet size %u too small\n", len);
+ return (IPPROTO_DONE);
+ }
+
+
+ /* verify the CARP checksum */
+ m->m_data += *offp;
+ if (carp_cksum(m, sizeof(*ch))) {
+ carpstats.carps_badsum++;
+ CARP_LOG("carp6_input: checksum failed, on %s\n",
+ 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 carp_softc *sc;
+ u_int64_t tmp_counter;
+ struct timeval sc_tv, ch_tv;
+
+ /* verify that the VHID is valid on the receiving interface */
+ CARP_LOCK(ifp->if_carp);
+ TAILQ_FOREACH(sc, &((struct carp_if *)ifp->if_carp)->vhif_vrs, sc_list)
+ if (sc->sc_vhid == ch->carp_vhid)
+ break;
+
+ if (!sc || !((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING))) {
+ carpstats.carps_badvhid++;
+ CARP_UNLOCK(ifp->if_carp);
+ m_freem(m);
+ return;
+ }
+
+ getmicrotime(&SC2IFP(sc)->if_lastchange);
+ SC2IFP(sc)->if_ipackets++;
+ SC2IFP(sc)->if_ibytes += m->m_pkthdr.len;
+
+ if (SC2IFP(sc)->if_bpf) {
+ struct ip *ip = mtod(m, struct ip *);
+
+ /* BPF wants net byte order */
+ ip->ip_len = htons(ip->ip_len + (ip->ip_hl << 2));
+ ip->ip_off = htons(ip->ip_off);
+ bpf_mtap(SC2IFP(sc)->if_bpf, m);
+ }
+
+ /* verify the CARP version. */
+ if (ch->carp_version != CARP_VERSION) {
+ carpstats.carps_badver++;
+ SC2IFP(sc)->if_ierrors++;
+ CARP_UNLOCK(ifp->if_carp);
+ CARP_LOG("%s; invalid version %d\n",
+ SC2IFP(sc)->if_xname,
+ ch->carp_version);
+ m_freem(m);
+ return;
+ }
+
+ /* verify the hash */
+ if (carp_hmac_verify(sc, ch->carp_counter, ch->carp_md)) {
+ carpstats.carps_badauth++;
+ SC2IFP(sc)->if_ierrors++;
+ CARP_UNLOCK(ifp->if_carp);
+ CARP_LOG("%s: incorrect hash\n", SC2IFP(sc)->if_xname);
+ m_freem(m);
+ return;
+ }
+
+ 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;
+ if (carp_suppress_preempt && sc->sc_advskew < 240)
+ sc_tv.tv_usec = 240 * 1000000 / 256;
+ else
+ sc_tv.tv_usec = sc->sc_advskew * 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_DEBUG("%s: MASTER -> BACKUP "
+ "(more frequent advertisement received)\n",
+ SC2IFP(sc)->if_xname);
+ carp_set_state(sc, BACKUP);
+ carp_setrun(sc, 0);
+ carp_setroute(sc, RTM_DELETE);
+ }
+ 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 (carp_opts[CARPCTL_PREEMPT] &&
+ timevalcmp(&sc_tv, &ch_tv, <)) {
+ CARP_DEBUG("%s: BACKUP -> MASTER "
+ "(preempting a slower master)\n",
+ SC2IFP(sc)->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_DEBUG("%s: BACKUP -> MASTER "
+ "(master timed out)\n",
+ SC2IFP(sc)->if_xname);
+ carp_master_down_locked(sc);
+ break;
+ }
+
+ /*
+ * Otherwise, we reset the counter and wait for the next
+ * advertisement.
+ */
+ carp_setrun(sc, af);
+ break;
+ }
+
+ CARP_UNLOCK(ifp->if_carp);
+
+ m_freem(m);
+ return;
+}
+
+static int
+carp_prepare_ad(struct mbuf *m, struct carp_softc *sc, struct carp_header *ch)
+{
+ struct m_tag *mtag;
+ struct ifnet *ifp = SC2IFP(sc);
+
+ if (sc->sc_init_counter) {
+ /* this could also be seconds since unix epoch */
+ sc->sc_counter = karc4random();
+ sc->sc_counter = sc->sc_counter << 32;
+ sc->sc_counter += karc4random();
+ } 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 */
+ mtag = m_tag_get(PACKET_TAG_CARP, sizeof(struct ifnet *), M_NOWAIT);
+ if (mtag == NULL) {
+ m_freem(m);
+ SC2IFP(sc)->if_oerrors++;
+ return (ENOMEM);
+ }
+ bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
+ m_tag_prepend(m, mtag);
+
+ return (0);
+}
+
+static void
+carp_send_ad_all(void)
+{
+ struct carp_softc *sc;
+
+ LIST_FOREACH(sc, &carpif_list, sc_next) {
+ if (sc->sc_carpdev == NULL)
+ continue;
+ CARP_SCLOCK(sc);
+ if ((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING) &&
+ sc->sc_state == MASTER)
+ carp_send_ad_locked(sc);
+ CARP_SCUNLOCK(sc);
+ }
+}
+
+static void
+carp_send_ad(void *v)
+{
+ struct carp_softc *sc = v;
+
+ CARP_SCLOCK(sc);
+ carp_send_ad_locked(sc);
+ CARP_SCUNLOCK(sc);
+}
+
+static void
+carp_send_ad_locked(struct carp_softc *sc)
+ struct carp_header ch;
+ struct timeval tv;
+ struct carp_header *ch_ptr;
+ struct mbuf *m;
+ int len, advbase, advskew;
+
+
+ /* bow out if we've lost our UPness or RUNNINGuiness */
+ if (!((SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING))) {
+ advbase = 255;
+ advskew = 255;
+ } else {
+ advbase = sc->sc_advbase;
+ if (!carp_suppress_preempt || sc->sc_advskew > 240)
+ advskew = sc->sc_advskew;
+ else
+ advskew = 240;
+ tv.tv_sec = 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 = advbase;
+ ch.carp_advskew = advskew;
+ ch.carp_authlen = 7; /* XXX DEFINE */
+ ch.carp_pad1 = 0; /* must be zero */
+ ch.carp_cksum = 0;
+
+#ifdef INET
+ if (sc->sc_ia) {
+ struct ip *ip;
+
+ MGETHDR(m, M_NOWAIT, MT_HEADER);
+ if (m == NULL) {
+ SC2IFP(sc)->if_oerrors++;
+ carpstats.carps_onomem++;
+ /* XXX maybe less ? */
+ if (advbase != 255 || advskew != 255)
+ callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
+ carp_send_ad, sc);
+ return;
+ }
+ 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 = len;
+ ip->ip_id = ip_newid();
+ ip->ip_off = IP_DF;
+ ip->ip_ttl = CARP_DFLTTL;
+ ip->ip_p = IPPROTO_CARP;
+ ip->ip_sum = 0;
+ ip->ip_src.s_addr = sc->sc_ia->ia_addr.sin_addr.s_addr;
+ 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))
+ return;
+
+ m->m_data += sizeof(*ip);
+ ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip));
+ m->m_data -= sizeof(*ip);
+
+ getmicrotime(&SC2IFP(sc)->if_lastchange);
+ SC2IFP(sc)->if_opackets++;
+ SC2IFP(sc)->if_obytes += len;
+ carpstats.carps_opackets++;
+
+ if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL)) {
+ SC2IFP(sc)->if_oerrors++;
+ if (sc->sc_sendad_errors < INT_MAX)
+ sc->sc_sendad_errors++;
+ if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
+ carp_suppress_preempt++;
+ if (carp_suppress_preempt == 1) {
+ CARP_SCUNLOCK(sc);
+ carp_send_ad_all();
+ CARP_SCLOCK(sc);
+ }
+ }
+ 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_suppress_preempt--;
+ sc->sc_sendad_errors = 0;
+ }
+ } else
+ sc->sc_sendad_errors = 0;
+ }
+ }
+#endif /* INET */
+#ifdef INET6
+ if (sc->sc_ia6) {
+ struct ip6_hdr *ip6;
+
+ MGETHDR(m, M_NOWAIT, MT_HEADER);
+ if (m == NULL) {
+ SC2IFP(sc)->if_oerrors++;
+ carpstats.carps_onomem++;
+ /* XXX maybe less ? */
+ if (advbase != 255 || advskew != 255)
+ callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
+ carp_send_ad, sc);
+ return;
+ }
+ 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;
+ bcopy(&sc->sc_ia6->ia_addr.sin6_addr, &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) {
+ SC2IFP(sc)->if_oerrors++;
+ m_freem(m);
+ CARP_LOG("%s: in6_setscope failed\n", __func__);
+ return;
+ }
+
+ ch_ptr = (struct carp_header *)(&ip6[1]);
+ bcopy(&ch, ch_ptr, sizeof(ch));
+ if (carp_prepare_ad(m, sc, ch_ptr))
+ return;
+
+ m->m_data += sizeof(*ip6);
+ ch_ptr->carp_cksum = carp_cksum(m, len - sizeof(*ip6));
+ m->m_data -= sizeof(*ip6);
+
+ getmicrotime(&SC2IFP(sc)->if_lastchange);
+ SC2IFP(sc)->if_opackets++;
+ SC2IFP(sc)->if_obytes += len;
+ carpstats.carps_opackets6++;
+
+ if (ip6_output(m, NULL, NULL, 0, &sc->sc_im6o, NULL, NULL)) {
+ SC2IFP(sc)->if_oerrors++;
+ if (sc->sc_sendad_errors < INT_MAX)
+ sc->sc_sendad_errors++;
+ if (sc->sc_sendad_errors == CARP_SENDAD_MAX_ERRORS) {
+ carp_suppress_preempt++;
+ if (carp_suppress_preempt == 1) {
+ CARP_SCUNLOCK(sc);
+ carp_send_ad_all();
+ CARP_SCLOCK(sc);
+ }
+ }
+ 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_suppress_preempt--;
+ sc->sc_sendad_errors = 0;
+ }
+ } else
+ sc->sc_sendad_errors = 0;
+ }
+ }
+#endif /* INET6 */
+
+ if (advbase != 255 || advskew != 255)
+ callout_reset(&sc->sc_ad_tmo, tvtohz_high(&tv),
+ carp_send_ad, sc);
+
+}
+
+/*
+ * 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;
+
+ TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
+
+ if (ifa->ifa_addr->sa_family != AF_INET)
+ continue;
+ lwkt_serialize_enter(sc->sc_carpdev->if_serializer);
+ arp_ifinit2(sc->sc_carpdev, ifa, IF_LLADDR(sc->sc_ifp));
+ lwkt_serialize_exit(sc->sc_carpdev->if_serializer);
+
+ DELAY(1000); /* XXX */
+ }
+}
+
+#ifdef INET6
+static void
+carp_send_na(struct carp_softc *sc)
+{
+ struct ifaddr *ifa;
+ struct in6_addr *in6;
+ static struct in6_addr mcast = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
+
+ TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
+
+ if (ifa->ifa_addr->sa_family != AF_INET6)
+ continue;
+
+ in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
+ nd6_na_output(sc->sc_carpdev, &mcast, in6,
+ ND_NA_FLAG_OVERRIDE, 1, NULL);
+ DELAY(1000); /* XXX */
+ }
+}
+#endif /* INET6 */
+
+static int
+carp_addrcount(struct carp_if *cif, struct in_ifaddr *ia, int type)
+{
+ struct carp_softc *vh;
+ struct ifaddr *ifa;
+ int count = 0;
+
+ CARP_LOCK_ASSERT(cif);
+
+ TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
+ if ((type == CARP_COUNT_RUNNING &&
+ (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) ||
+ (type == CARP_COUNT_MASTER && vh->sc_state == MASTER)) {
+ TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
+ ifa_list) {
+ if (ifa->ifa_addr->sa_family == AF_INET &&
+ ia->ia_addr.sin_addr.s_addr ==
+ ifatoia(ifa)->ia_addr.sin_addr.s_addr)
+ count++;
+ }
+ }
+ }
+ return (count);
+}
+
+int
+carp_iamatch(void *v, struct in_ifaddr *ia,
+ struct in_addr *isaddr, u_int8_t **enaddr)
+{
+ struct carp_if *cif = v;
+ struct carp_softc *vh;
+ int index, count = 0;
+ struct ifaddr *ifa;
+
+ CARP_LOCK(cif);
+
+ if (carp_opts[CARPCTL_ARPBALANCE]) {
+ /*
+ * XXX proof of concept implementation.
+ * We use the source ip to decide which virtual host should
+ * handle the request. If we're master of that virtual host,
+ * then we respond, otherwise, just drop the arp packet on
+ * the floor.
+ */
+ count = carp_addrcount(cif, ia, CARP_COUNT_RUNNING);
+ if (count == 0) {
+ /* should never reach this */
+ CARP_UNLOCK(cif);
+ return (0);
+ }
+
+ /* this should be a hash, like pf_hash() */
+ index = ntohl(isaddr->s_addr) % count;
+ count = 0;
+
+ TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
+ if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING)) {
+ TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist,
+ ifa_list) {
+ if (ifa->ifa_addr->sa_family ==
+ AF_INET &&
+ ia->ia_addr.sin_addr.s_addr ==
+ ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
+ if (count == index) {
+ if (vh->sc_state ==
+ MASTER) {
+ *enaddr = IF_LLADDR(vh->sc_ifp);
+ CARP_UNLOCK(cif);
+ return (1);
+ } else {
+ CARP_UNLOCK(cif);
+ return (0);
+ }
+ }
+ count++;
+ }
+ }
+ }
+ }
+ } else {
+ TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
+ if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) &&
+ vh->sc_state == MASTER) {
+ *enaddr = IF_LLADDR(vh->sc_ifp);
+ CARP_UNLOCK(cif);
+ return (1);
+ }
+ }
+ }
+ CARP_UNLOCK(cif);
+ return(0);
+}
+
+#ifdef INET6
+struct ifaddr *
+carp_iamatch6(void *v, struct in6_addr *taddr)
+{
+ struct carp_if *cif = v;
+ struct carp_softc *vh;
+ struct ifaddr *ifa;
+
+ CARP_LOCK(cif);
+ TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list) {
+ TAILQ_FOREACH(ifa, &SC2IFP(vh)->if_addrlist, ifa_list) {
+ if (IN6_ARE_ADDR_EQUAL(taddr,
+ &ifatoia6(ifa)->ia_addr.sin6_addr) &&
+ (SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) &&
+ vh->sc_state == MASTER) {
+ CARP_UNLOCK(cif);
+ return (ifa);
+ }
+ }
+ }
+ CARP_UNLOCK(cif);
+
+ return (NULL);
+}
+
+void *
+carp_macmatch6(void *v, struct mbuf *m, const struct in6_addr *taddr)
+{
+ struct m_tag *mtag;
+ struct carp_if *cif = v;
+ struct carp_softc *sc;
+ struct ifaddr *ifa;
+
+ CARP_LOCK(cif);
+ TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list) {
+ TAILQ_FOREACH(ifa, &SC2IFP(sc)->if_addrlist, ifa_list) {
+ if (IN6_ARE_ADDR_EQUAL(taddr,
+ &ifatoia6(ifa)->ia_addr.sin6_addr) &&
+ (SC2IFP(sc)->if_flags & IFF_UP) && (SC2IFP(sc)->if_flags & IFF_RUNNING)) {
+ struct ifnet *ifp = SC2IFP(sc);
+ mtag = m_tag_get(PACKET_TAG_CARP,
+ sizeof(struct ifnet *), M_NOWAIT);
+ if (mtag == NULL) {
+ /* better a bit than nothing */
+ CARP_UNLOCK(cif);
+ return (IF_LLADDR(sc->sc_ifp));
+ }
+ bcopy(&ifp, (caddr_t)(mtag + 1),
+ sizeof(struct ifnet *));
+ m_tag_prepend(m, mtag);
+
+ CARP_UNLOCK(cif);
+ return (IF_LLADDR(sc->sc_ifp));
+ }
+ }
+ }
+ CARP_UNLOCK(cif);
+
+ return (NULL);
+}
+#endif
+
+struct ifnet *
+carp_forus(void *v, void *dhost)
+{
+ struct carp_if *cif = v;
+ struct carp_softc *vh;
+ u_int8_t *ena = dhost;
+
+ /**
+ * XXX: See here for check on MAC adr is not for virtual use
+ *
+ **/
+
+ if (ena[0] || ena[1] || ena[2] != 0x5e || ena[3] || ena[4] != 1)
+ {
+ return (NULL);
+ }
+
+ CARP_LOCK(cif);
+ TAILQ_FOREACH(vh, &cif->vhif_vrs, sc_list)
+ if ((SC2IFP(vh)->if_flags & IFF_UP) && (SC2IFP(vh)->if_flags & IFF_RUNNING) &&
+ vh->sc_state == MASTER &&
+ !bcmp(dhost, IF_LLADDR(vh->sc_ifp), ETHER_ADDR_LEN)) {
+ CARP_UNLOCK(cif);
+ return (SC2IFP(vh));
+ }
+
+ CARP_UNLOCK(cif);
+ return (NULL);
+}
+
+static void
+carp_master_down(void *v)
+{
+ struct carp_softc *sc = v;
+
+ lwkt_serialize_enter(sc->sc_ifp->if_serializer);
+ carp_master_down_locked(sc);
+ lwkt_serialize_exit(sc->sc_ifp->if_serializer);
+}
+
+static void
+carp_master_down_locked(struct carp_softc *sc)
+{
+ if (sc->sc_carpdev)
+ CARP_SCLOCK_ASSERT(sc);
+
+ switch (sc->sc_state) {
+ case INIT:
+ kprintf("%s: master_down event in INIT state\n",
+ SC2IFP(sc)->if_xname);
+ break;
+ case MASTER:
+ break;
+ case BACKUP:
+ carp_set_state(sc, MASTER);
+ carp_send_ad_locked(sc);
+ carp_send_arp(sc);
+#ifdef INET6
+ carp_send_na(sc);
+#endif /* INET6 */
+ carp_setrun(sc, 0);
+ carp_setroute(sc, RTM_ADD);
+ 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;
+
+ if (sc->sc_carpdev == NULL) {
+ SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
+ carp_set_state(sc, INIT);
+ return;
+ }
+
+ if (SC2IFP(sc)->if_flags & IFF_UP &&
+ sc->sc_vhid > 0 && (sc->sc_naddrs || sc->sc_naddrs6))
+ SC2IFP(sc)->if_flags |= IFF_RUNNING;
+ else {
+ SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
+ carp_setroute(sc, RTM_DELETE);
+ return;
+ }
+
+ switch (sc->sc_state) {
+ case INIT:
+ if (carp_opts[CARPCTL_PREEMPT] && !carp_suppress_preempt) {
+ carp_send_ad_locked(sc);
+ carp_send_arp(sc);
+#ifdef INET6
+ carp_send_na(sc);
+#endif /* INET6 */
+ CARP_DEBUG("%s: INIT -> MASTER (preempting)\n",
+ SC2IFP(sc)->if_xname);
+ carp_set_state(sc, MASTER);
+ carp_setroute(sc, RTM_ADD);
+ } else {
+ CARP_DEBUG("%s: INIT -> BACKUP\n", SC2IFP(sc)->if_xname);
+ carp_set_state(sc, BACKUP);
+ carp_setroute(sc, RTM_DELETE);
+ 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_high(&tv),
+ carp_master_down, sc);
+ break;
+#endif /* INET */
+#ifdef INET6
+ case AF_INET6:
+ callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
+ carp_master_down, sc);
+ break;
+#endif /* INET6 */
+ default:
+ if (sc->sc_naddrs)
+ callout_reset(&sc->sc_md_tmo, tvtohz_high(&tv),
+ carp_master_down, sc);
+ if (sc->sc_naddrs6)
+ callout_reset(&sc->sc_md6_tmo, tvtohz_high(&tv),
+ carp_master_down, sc);
+ 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_high(&tv),
+ carp_send_ad, sc);
+ break;
+ }
+}
+
+static void
+carp_multicast_cleanup(struct carp_softc *sc)
+{
+ struct ip_moptions *imo = &sc->sc_imo;
+ u_int16_t n = imo->imo_num_memberships;
+
+ /* Clean up our own multicast memberships */
+ while (n-- > 0) {
+ if (imo->imo_membership[n] != NULL) {
+ in_delmulti(imo->imo_membership[n]);
+ imo->imo_membership[n] = NULL;
+ }
+ }
+ imo->imo_num_memberships = 0;
+ imo->imo_multicast_ifp = NULL;
+}
+
+#ifdef INET6
+static void
+carp_multicast6_cleanup(struct carp_softc *sc)
+{
+ struct ip6_moptions *im6o = &sc->sc_im6o;
+
+ while (!LIST_EMPTY(&im6o->im6o_memberships)) {
+ struct in6_multi_mship *imm =
+ LIST_FIRST(&im6o->im6o_memberships);
+
+ LIST_REMOVE(imm, i6mm_chain);
+ in6_leavegroup(imm);
+ }
+ im6o->im6o_multicast_ifp = NULL;
+}
+#endif
+
+static int
+carp_set_addr(struct carp_softc *sc, struct sockaddr_in *sin)
+{
+ struct ifnet *ifp;
+ struct carp_if *cif;
+ struct in_ifaddr *ia, *ia_if;
+ struct ip_moptions *imo = &sc->sc_imo;
+ struct in_addr addr;
+ u_long iaddr = htonl(sin->sin_addr.s_addr);
+ int own, error;
+
+ if (sin->sin_addr.s_addr == 0)
+ {
+ if (!(SC2IFP(sc)->if_flags & IFF_UP))
+ {
+ carp_set_state(sc, INIT);
+ }
+ if (sc->sc_naddrs)
+ {
+ SC2IFP(sc)->if_flags |= IFF_UP;
+ }
+ carp_setrun(sc, 0);
+ return (0);
+ }
+ /* we have to do it by hands to check we won't match on us */
+ ia_if = NULL; own = 0;
+ TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
+ /* and, yeah, we need a multicast-capable iface too */
+ if (ia->ia_ifp != SC2IFP(sc) &&
+ (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
+ (iaddr & ia->ia_subnetmask) == ia->ia_subnet) {
+ if (!ia_if)
+ ia_if = ia;
+ if (sin->sin_addr.s_addr ==
+ ia->ia_addr.sin_addr.s_addr)
+ own++;
+ }
+ }
+
+
+ if (!ia_if)
+ return (EADDRNOTAVAIL);
+
+ ia = ia_if;
+ ifp = ia->ia_ifp;
+
+ if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
+ (imo->imo_multicast_ifp && imo->imo_multicast_ifp != ifp))
+ return (EADDRNOTAVAIL);
+
+ if (imo->imo_num_memberships == 0) {
+ addr.s_addr = htonl(INADDR_CARP_GROUP);
+ if ((imo->imo_membership[0] = in_addmulti(&addr, ifp)) == NULL)
+ return (ENOBUFS);
+ imo->imo_num_memberships++;
+ imo->imo_multicast_ifp = ifp;
+ imo->imo_multicast_ttl = CARP_DFLTTL;
+ imo->imo_multicast_loop = 0;
+ }
+
+ if (!ifp->if_carp) {
+
+ MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
+ M_WAITOK|M_ZERO);
+ if (!cif) {
+ error = ENOBUFS;
+ goto cleanup;
+ }
+ if ((error = ifpromisc(ifp, 1))) {
+ FREE(cif, M_CARP);
+ goto cleanup;
+ }
+
+ CARP_LOCK_INIT(cif);
+ CARP_LOCK(cif);
+ cif->vhif_ifp = ifp;
+ TAILQ_INIT(&cif->vhif_vrs);
+ ifp->if_carp = cif;
+
+ } else {
+ struct carp_softc *vr;
+
+ cif = (struct carp_if *)ifp->if_carp;
+ CARP_LOCK(cif);
+ TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
+ if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
+ CARP_UNLOCK(cif);
+ error = EINVAL;
+ goto cleanup;
+ }
+ }
+ sc->sc_ia = ia;
+ sc->sc_carpdev = ifp;
+
+ { /* XXX prevent endless loop if already in queue */
+ struct carp_softc *vr, *after = NULL;
+ int myself = 0;
+ cif = (struct carp_if *)ifp->if_carp;
+
+ /* XXX: cif should not change, right? So we still hold the lock */
+ CARP_LOCK_ASSERT(cif);
+
+ TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
+ if (vr == sc)
+ myself = 1;
+ if (vr->sc_vhid < sc->sc_vhid)
+ after = vr;
+ }
+
+ if (!myself) {
+ /* We're trying to keep things in order */
+ if (after == NULL) {
+ TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
+ } else {
+ TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
+ }
+ cif->vhif_nvrs++;
+ }
+ }
+
+ sc->sc_naddrs++;
+ SC2IFP(sc)->if_flags |= IFF_UP;
+ if (own)
+ sc->sc_advskew = 0;
+
+
+ carp_sc_state_locked(sc);
+ carp_setrun(sc, 0);
+
+ CARP_UNLOCK(cif);
+
+ return (0);
+
+cleanup:
+ in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
+ return (error);
+
+}
+
+static int
+carp_del_addr(struct carp_softc *sc, struct sockaddr_in *sin)
+{
+ int error = 0;
+
+ if (!--sc->sc_naddrs) {
+ struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
+ struct ip_moptions *imo = &sc->sc_imo;
+
+ CARP_LOCK(cif);
+ callout_stop(&sc->sc_ad_tmo);
+ SC2IFP(sc)->if_flags &= ~IFF_UP;
+ SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
+ sc->sc_vhid = -1;
+ in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
+ imo->imo_multicast_ifp = NULL;
+ TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
+ if (!--cif->vhif_nvrs) {
+ sc->sc_carpdev->if_carp = NULL;
+ CARP_LOCK_DESTROY(cif);
+ FREE(cif, M_IFADDR);
+ } else {
+ CARP_UNLOCK(cif);
+ }
+ }
+
+ return (error);
+}
+
+#ifdef INET6
+static int
+carp_set_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
+{
+ struct ifnet *ifp;
+ struct carp_if *cif;
+ struct in6_ifaddr *ia, *ia_if;
+ struct ip6_moptions *im6o = &sc->sc_im6o;
+ struct in6_multi_mship *imm;
+ struct in6_addr in6;
+ int own, error;
+
+ if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
+ if (!(SC2IFP(sc)->if_flags & IFF_UP))
+ carp_set_state(sc, INIT);
+ if (sc->sc_naddrs6)
+ SC2IFP(sc)->if_flags |= IFF_UP;
+ carp_setrun(sc, 0);
+ return (0);
+ }
+
+ /* we have to do it by hands to check we won't match on us */
+ ia_if = NULL; own = 0;
+ for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ if ((sin6->sin6_addr.s6_addr32[i] &
+ ia->ia_prefixmask.sin6_addr.s6_addr32[i]) !=
+ (ia->ia_addr.sin6_addr.s6_addr32[i] &
+ ia->ia_prefixmask.sin6_addr.s6_addr32[i]))
+ break;
+ }
+ /* and, yeah, we need a multicast-capable iface too */
+ if (ia->ia_ifp != SC2IFP(sc) &&
+ (ia->ia_ifp->if_flags & IFF_MULTICAST) &&
+ (i == 4)) {
+ if (!ia_if)
+ ia_if = ia;
+ if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
+ &ia->ia_addr.sin6_addr))
+ own++;
+ }
+ }
+
+ if (!ia_if)
+ return (EADDRNOTAVAIL);
+ ia = ia_if;
+ ifp = ia->ia_ifp;
+
+ if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0 ||
+ (im6o->im6o_multicast_ifp && im6o->im6o_multicast_ifp != ifp))
+ return (EADDRNOTAVAIL);
+
+ if (!sc->sc_naddrs6) {
+ im6o->im6o_multicast_ifp = ifp;
+
+ /* join CARP multicast address */
+ bzero(&in6, sizeof(in6));
+ in6.s6_addr16[0] = htons(0xff02);
+ in6.s6_addr8[15] = 0x12;
+ if (in6_setscope(&in6, ifp, NULL) != 0)
+ goto cleanup;
+ if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
+ goto cleanup;
+ LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
+
+ /* 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] = sin6->sin6_addr.s6_addr32[3];
+ in6.s6_addr8[12] = 0xff;
+ if (in6_setscope(&in6, ifp, NULL) != 0)
+ goto cleanup;
+ if ((imm = in6_joingroup(ifp, &in6, &error)) == NULL)
+ goto cleanup;
+ LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain);
+ }
+
+ if (!ifp->if_carp) {
+ MALLOC(cif, struct carp_if *, sizeof(*cif), M_CARP,
+ M_WAITOK|M_ZERO);
+ if (!cif) {
+ error = ENOBUFS;
+ goto cleanup;
+ }
+ if ((error = ifpromisc(ifp, 1))) {
+ FREE(cif, M_CARP);
+ goto cleanup;
+ }
+
+ CARP_LOCK_INIT(cif);
+ CARP_LOCK(cif);
+ cif->vhif_ifp = ifp;
+ TAILQ_INIT(&cif->vhif_vrs);
+ ifp->if_carp = cif;
+
+ } else {
+ struct carp_softc *vr;
+
+ cif = (struct carp_if *)ifp->if_carp;
+ CARP_LOCK(cif);
+ TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
+ if (vr != sc && vr->sc_vhid == sc->sc_vhid) {
+ CARP_UNLOCK(cif);
+ error = EINVAL;
+ goto cleanup;
+ }
+ }
+ sc->sc_ia6 = ia;
+ sc->sc_carpdev = ifp;
+
+ { /* XXX prevent endless loop if already in queue */
+ struct carp_softc *vr, *after = NULL;
+ int myself = 0;
+ cif = (struct carp_if *)ifp->if_carp;
+ CARP_LOCK_ASSERT(cif);
+
+ TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list) {
+ if (vr == sc)
+ myself = 1;
+ if (vr->sc_vhid < sc->sc_vhid)
+ after = vr;
+ }
+
+ if (!myself) {
+ /* We're trying to keep things in order */
+ if (after == NULL) {
+ TAILQ_INSERT_TAIL(&cif->vhif_vrs, sc, sc_list);
+ } else {
+ TAILQ_INSERT_AFTER(&cif->vhif_vrs, after, sc, sc_list);
+ }
+ cif->vhif_nvrs++;
+ }
+ }
+
+ sc->sc_naddrs6++;
+ SC2IFP(sc)->if_flags |= IFF_UP;
+ if (own)
+ sc->sc_advskew = 0;
+ carp_sc_state_locked(sc);
+ carp_setrun(sc, 0);
+
+ CARP_UNLOCK(cif);
+
+ return (0);
+
+cleanup:
+ /* clean up multicast memberships */
+ if (!sc->sc_naddrs6) {
+ while (!LIST_EMPTY(&im6o->im6o_memberships)) {
+ imm = LIST_FIRST(&im6o->im6o_memberships);
+ LIST_REMOVE(imm, i6mm_chain);
+ in6_leavegroup(imm);
+ }
+ }
+ return (error);
+}
+
+static int
+carp_del_addr6(struct carp_softc *sc, struct sockaddr_in6 *sin6)
+{
+ int error = 0;
+
+ if (!--sc->sc_naddrs6) {
+ struct carp_if *cif = (struct carp_if *)sc->sc_carpdev->if_carp;
+ struct ip6_moptions *im6o = &sc->sc_im6o;
+
+ CARP_LOCK(cif);
+ callout_stop(&sc->sc_ad_tmo);
+ SC2IFP(sc)->if_flags &= ~IFF_UP;
+ SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
+ sc->sc_vhid = -1;
+ while (!LIST_EMPTY(&im6o->im6o_memberships)) {
+ struct in6_multi_mship *imm =
+ LIST_FIRST(&im6o->im6o_memberships);
+
+ LIST_REMOVE(imm, i6mm_chain);
+ in6_leavegroup(imm);
+ }
+ im6o->im6o_multicast_ifp = NULL;
+ TAILQ_REMOVE(&cif->vhif_vrs, sc, sc_list);
+ if (!--cif->vhif_nvrs) {
+ CARP_LOCK_DESTROY(cif);
+ sc->sc_carpdev->if_carp = NULL;
+ FREE(cif, M_IFADDR);
+ } else
+ CARP_UNLOCK(cif);
+ }
+
+ return (error);
+}
+#endif /* INET6 */
+
+static int
+carp_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr, struct ucred *creds)
+{
+ struct carp_softc *sc = ifp->if_softc, *vr;
+ struct carpreq carpr;
+ struct ifaddr *ifa;
+ struct ifreq *ifr;
+ struct ifaliasreq *ifra;
+ int locked = 0, error = 0;
+
+ ifa = (struct ifaddr *)addr;
+ ifra = (struct ifaliasreq *)addr;
+ ifr = (struct ifreq *)addr;
+
+
+ switch (cmd) {
+ case SIOCSIFADDR:
+ switch (ifa->ifa_addr->sa_family) {
+#ifdef INET
+ case AF_INET:
+ SC2IFP(sc)->if_flags |= IFF_UP;
+ bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
+ sizeof(struct sockaddr));
+ error = carp_set_addr(sc, satosin(ifa->ifa_addr));
+ break;
+#endif /* INET */
+#ifdef INET6
+ case AF_INET6:
+ SC2IFP(sc)->if_flags |= IFF_UP;
+ error = carp_set_addr6(sc, satosin6(ifa->ifa_addr));
+ break;
+#endif /* INET6 */
+ default:
+ error = EAFNOSUPPORT;
+ break;
+ }
+ break;
+
+ case SIOCAIFADDR:
+ switch (ifa->ifa_addr->sa_family) {
+#ifdef INET
+ case AF_INET:
+ SC2IFP(sc)->if_flags |= IFF_UP;
+ bcopy(ifa->ifa_addr, ifa->ifa_dstaddr,
+ sizeof(struct sockaddr));
+ error = carp_set_addr(sc, satosin(&ifra->ifra_addr));
+ break;
+#endif /* INET */
+#ifdef INET6
+ case AF_INET6:
+ SC2IFP(sc)->if_flags |= IFF_UP;
+ error = carp_set_addr6(sc, satosin6(&ifra->ifra_addr));
+ break;
+#endif /* INET6 */
+ default:
+ error = EAFNOSUPPORT;
+ break;
+ }
+ break;
+
+ case SIOCDIFADDR:
+ switch (ifa->ifa_addr->sa_family) {
+#ifdef INET
+ case AF_INET:
+ error = carp_del_addr(sc, satosin(&ifra->ifra_addr));
+ break;
+#endif /* INET */
+#ifdef INET6
+ case AF_INET6:
+ error = carp_del_addr6(sc, satosin6(&ifra->ifra_addr));
+ break;
+#endif /* INET6 */
+ error = EAFNOSUPPORT;
+ break;
+ }
+ break;
+
+ case SIOCSIFFLAGS:
+ if (sc->sc_carpdev) {
+ locked = 1;
+ CARP_SCLOCK(sc);
+ }
+ if (sc->sc_state != INIT && !(ifr->ifr_flags & IFF_UP)) {
+ callout_stop(&sc->sc_ad_tmo);
+ callout_stop(&sc->sc_md_tmo);
+ callout_stop(&sc->sc_md6_tmo);
+ if (sc->sc_state == MASTER)
+ carp_send_ad_locked(sc);
+ carp_set_state(sc, INIT);
+ carp_setrun(sc, 0);
+ } else if (sc->sc_state == INIT && (ifr->ifr_flags & IFF_UP)) {
+ SC2IFP(sc)->if_flags |= IFF_UP;
+ carp_setrun(sc, 0);
+ }
+ break;
+
+ case SIOCSVH:
+ error = suser(curthread);
+ if (error)
+ break;
+ if ((error = copyin(ifr->ifr_data, &carpr, sizeof carpr)))
+ break;
+ error = 1;
+ if (sc->sc_carpdev) {
+ locked = 1;
+ CARP_SCLOCK(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_setroute(sc, RTM_DELETE);
+ break;
+ case MASTER:
+ carp_master_down_locked(sc);
+ break;
+ default:
+ break;
+ }
+ }
+ if (carpr.carpr_vhid > 0) {
+ if (carpr.carpr_vhid > 255) {
+ error = EINVAL;
+ break;
+ }
+ if (sc->sc_carpdev) {
+ struct carp_if *cif;
+ cif = (struct carp_if *)sc->sc_carpdev->if_carp;
+ TAILQ_FOREACH(vr, &cif->vhif_vrs, sc_list)
+ if (vr != sc &&
+ vr->sc_vhid == carpr.carpr_vhid)
+ return EEXIST;
+ }
+ sc->sc_vhid = carpr.carpr_vhid;
+ IF_LLADDR(sc->sc_ifp)[0] = 0;
+ IF_LLADDR(sc->sc_ifp)[1] = 0;
+ IF_LLADDR(sc->sc_ifp)[2] = 0x5e;
+ IF_LLADDR(sc->sc_ifp)[3] = 0;
+ IF_LLADDR(sc->sc_ifp)[4] = 1;
+ IF_LLADDR(sc->sc_ifp)[5] = sc->sc_vhid;
+ error--;
+ }
+ if (carpr.carpr_advbase > 0 || carpr.carpr_advskew > 0) {
+ if (carpr.carpr_advskew >= 255) {
+ error = EINVAL;
+ break;
+ }
+ if (carpr.carpr_advbase > 255) {
+ error = EINVAL;
+ break;
+ }
+ sc->sc_advbase = carpr.carpr_advbase;
+ sc->sc_advskew = carpr.carpr_advskew;
+ error--;
+ }
+ bcopy(carpr.carpr_key, sc->sc_key, sizeof(sc->sc_key));
+ if (error > 0)
+ error = EINVAL;
+ else {
+ error = 0;
+ carp_setrun(sc, 0);
+ }
+ break;
+
+ case SIOCGVH:
+ /* XXX: lockless read */
+ bzero(&carpr, sizeof(carpr));
+ carpr.carpr_state = sc->sc_state;
+ carpr.carpr_vhid = sc->sc_vhid;
+ carpr.carpr_advbase = sc->sc_advbase;
+ carpr.carpr_advskew = sc->sc_advskew;
+ error = suser(curthread);
+ if (error == 0)
+ bcopy(sc->sc_key, carpr.carpr_key,
+ sizeof(carpr.carpr_key));
+ error = copyout(&carpr, ifr->ifr_data, sizeof(carpr));
+ break;
+
+ default:
+ error = EINVAL;
+ }
+
+ if (locked)
+ CARP_SCUNLOCK(sc);
+
+ carp_hmac_prepare(sc);
+
+ return (error);
+}
+
+/*
+ * XXX: this is looutput. We should eventually use it from there.
+ */
+static int
+carp_looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
+ struct rtentry *rt)
+{
+ u_int32_t af;
+
+ M_ASSERTPKTHDR(m); /* check if we have the packet header */
+
+ if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
+ m_freem(m);
+ return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
+ rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
+ }
+
+ ifp->if_opackets++;
+ ifp->if_obytes += m->m_pkthdr.len;
+
+ /* BPF writes need to be handled specially. */
+ if (dst->sa_family == AF_UNSPEC) {
+ bcopy(dst->sa_data, &af, sizeof(af));
+ dst->sa_family = af;
+ }
+
+#if 1 /* XXX */
+ switch (dst->sa_family) {
+ case AF_INET:
+ case AF_INET6:
+ case AF_IPX:
+ case AF_APPLETALK:
+ break;
+ default:
+ m_freem(m);
+ return (EAFNOSUPPORT);
+ }
+#endif
+ return(if_simloop(ifp, m, dst->sa_family, 0));
+}
+
+/*
+ * Start output on carp interface. This function should never be called.
+ */
+static void
+carp_start(struct ifnet *ifp)
+{
+#ifdef DEBUG
+ kprintf("%s: start called\n", ifp->if_xname);
+#endif
+}
+
+int
+carp_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
+ struct rtentry *rt)
+{
+ struct m_tag *mtag;
+ struct carp_softc *sc;
+ struct ifnet *carp_ifp;
+
+ if (!sa)
+ return (0);
+
+ switch (sa->sa_family) {
+#ifdef INET
+ case AF_INET:
+ break;
+#endif /* INET */
+#ifdef INET6
+ case AF_INET6:
+ break;
+#endif /* INET6 */
+ default:
+ return (0);
+ }
+
+ mtag = m_tag_find(m, PACKET_TAG_CARP, NULL);
+ if (mtag == NULL)
+ return (0);
+
+ bcopy(mtag + 1, &carp_ifp, sizeof(struct ifnet *));
+ sc = carp_ifp->if_softc;
+
+ /* Set the source MAC address to Virtual Router MAC Address */
+ switch (ifp->if_type) {
+ case IFT_ETHER:
+ 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:
+ kprintf("%s: carp is not supported for this interface type\n",
+ ifp->if_xname);
+ return (EOPNOTSUPP);
+ }
+
+ return (0);
+
+}
+
+static void
+carp_set_state(struct carp_softc *sc, int state)
+{
+
+ if (sc->sc_carpdev)
+ CARP_SCLOCK_ASSERT(sc);
+
+ if (sc->sc_state == state)
+ return;
+
+ sc->sc_state = state;
+ switch (state) {
+ case BACKUP:
+ SC2IFP(sc)->if_link_state = LINK_STATE_DOWN;
+ break;
+ case MASTER:
+ SC2IFP(sc)->if_link_state = LINK_STATE_UP;
+ break;
+ default:
+ SC2IFP(sc)->if_link_state = LINK_STATE_UNKNOWN;
+ break;
+ }
+ rt_ifmsg(SC2IFP(sc));
+}
+
+void
+carp_carpdev_state(void *v)
+{
+ struct carp_if *cif = v;
+
+ CARP_LOCK(cif);
+ carp_carpdev_state_locked(cif);
+ CARP_UNLOCK(cif);
+}
+
+static void
+carp_carpdev_state_locked(struct carp_if *cif)
+{
+ struct carp_softc *sc;
+
+ TAILQ_FOREACH(sc, &cif->vhif_vrs, sc_list)
+ carp_sc_state_locked(sc);
+}
+
+static void
+carp_sc_state_locked(struct carp_softc *sc)
+{
+ CARP_SCLOCK_ASSERT(sc);
+
+ if ( !(sc->sc_carpdev->if_flags & IFF_UP)) {
+ sc->sc_flags_backup = SC2IFP(sc)->if_flags;
+ SC2IFP(sc)->if_flags &= ~IFF_UP;
+ SC2IFP(sc)->if_flags &= ~IFF_RUNNING;
+ callout_stop(&sc->sc_ad_tmo);
+ callout_stop(&sc->sc_md_tmo);
+ callout_stop(&sc->sc_md6_tmo);
+ carp_set_state(sc, INIT);
+ carp_setrun(sc, 0);
+ if (!sc->sc_suppress) {
+ carp_suppress_preempt++;
+ if (carp_suppress_preempt == 1) {
+ CARP_SCUNLOCK(sc);
+ carp_send_ad_all();
+ CARP_SCLOCK(sc);
+ }
+ }
+ sc->sc_suppress = 1;
+ } else {
+ SC2IFP(sc)->if_flags |= sc->sc_flags_backup;
+ carp_set_state(sc, INIT);
+ carp_setrun(sc, 0);
+ if (sc->sc_suppress)
+ carp_suppress_preempt--;
+ sc->sc_suppress = 0;
+ }
+
+ return;
+}
+
+static int
+carp_modevent(module_t mod, int type, void *data)
+{
+ switch (type) {
+ case MOD_LOAD:
+ if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
+ carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
+ if (if_detach_event_tag == NULL)
+ return (ENOMEM);
+
+ LIST_INIT(&carpif_list);
+ if_clone_attach(&carp_cloner);
+ break;
+
+ case MOD_UNLOAD:
+ EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
+ if_clone_detach(&carp_cloner);
+ break;
+
+ default:
+ return (EINVAL);
+ }
+
+ return (0);
+}
+
+static moduledata_t carp_mod = {
+ "carp",
+ carp_modevent,
+ 0
+};
+
+DECLARE_MODULE(carp, carp_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
diff --git a/sys/netinet/ip_carp.h b/sys/netinet/ip_carp.h
new file mode 100644
index 0000000..5d3b6d1
--- /dev/null
+++ b/sys/netinet/ip_carp.h
@@ -0,0 +1,167 @@
+/* $Id$ */
+/* from $FreeBSD: src/sys/netinet/ip_carp.h,v 1.3 2006/12/01 18:37:41 imp Exp $ */
+/* from $OpenBSD: ip_carp.h,v 1.8 2004/07/29 22:12:15 mcbride Exp $ */
+
+/*
+ * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
+ * Copyright (c) 2003 Ryan McBride. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _IP_CARP_H
+#define _IP_CARP_H
+
+/*
+ * The CARP header layout is as follows:
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |Version| Type | VirtualHostID | AdvSkew | Auth Len |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Reserved | AdvBase | Checksum |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Counter (1) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Counter (2) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SHA-1 HMAC (1) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SHA-1 HMAC (2) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SHA-1 HMAC (3) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SHA-1 HMAC (4) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SHA-1 HMAC (5) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ */
+
+struct carp_header {
+#if BYTE_ORDER == LITTLE_ENDIAN
+ u_int8_t carp_type:4,
+ carp_version:4;
+#endif
+#if BYTE_ORDER == BIG_ENDIAN
+ u_int8_t carp_version:4,
+ carp_type:4;
+#endif
+ u_int8_t carp_vhid; /* virtual host id */
+ u_int8_t carp_advskew; /* advertisement skew */
+ u_int8_t carp_authlen; /* size of counter+md, 32bit chunks */
+ u_int8_t carp_pad1; /* reserved */
+ u_int8_t carp_advbase; /* advertisement interval */
+ u_int16_t carp_cksum;
+ u_int32_t carp_counter[2];
+ unsigned char carp_md[20]; /* SHA1 HMAC */
+} __packed;
+
+#ifdef CTASSERT
+CTASSERT(sizeof(struct carp_header) == 36);
+#endif
+
+#define CARP_DFLTTL 255
+
+/* carp_version */
+#define CARP_VERSION 2
+
+/* carp_type */
+#define CARP_ADVERTISEMENT 0x01
+
+#define CARP_KEY_LEN 20 /* a sha1 hash of a passphrase */
+
+/* carp_advbase */
+#define CARP_DFLTINTV 1
+
+/*
+ * Statistics.
+ */
+struct carpstats {
+ uint64_t carps_ipackets; /* total input packets, IPv4 */
+ uint64_t carps_ipackets6; /* total input packets, IPv6 */
+ uint64_t carps_badif; /* wrong interface */
+ uint64_t carps_badttl; /* TTL is not CARP_DFLTTL */
+ uint64_t carps_hdrops; /* packets shorter than hdr */
+ uint64_t carps_badsum; /* bad checksum */
+ uint64_t carps_badver; /* bad (incl unsupp) version */
+ uint64_t carps_badlen; /* data length does not match */
+ uint64_t carps_badauth; /* bad authentication */
+ uint64_t carps_badvhid; /* bad VHID */
+ uint64_t carps_badaddrs; /* bad address list */
+
+ uint64_t carps_opackets; /* total output packets, IPv4 */
+ uint64_t carps_opackets6; /* total output packets, IPv6 */
+ uint64_t carps_onomem; /* no memory for an mbuf */
+ uint64_t carps_ostates; /* total state updates sent */
+
+ uint64_t carps_preempt; /* if enabled, preemptions */
+};
+
+/*
+ * Configuration structure for SIOCSVH SIOCGVH
+ */
+struct carpreq {
+ int carpr_state;
+#define CARP_STATES "INIT", "BACKUP", "MASTER"
+#define CARP_MAXSTATE 2
+ int carpr_vhid;
+ int carpr_advskew;
+ int carpr_advbase;
+ unsigned char carpr_key[CARP_KEY_LEN];
+};
+#define SIOCSVH _IOWR('i', 245, struct ifreq)
+#define SIOCGVH _IOWR('i', 246, struct ifreq)
+
+/*
+ * Names for CARP sysctl objects
+ */
+#define CARPCTL_ALLOW 1 /* accept incoming CARP packets */
+#define CARPCTL_PREEMPT 2 /* high-pri backup preemption mode */
+#define CARPCTL_LOG 3 /* log bad packets */
+#define CARPCTL_STATS 4 /* statistics (read-only) */
+#define CARPCTL_ARPBALANCE 5 /* balance arp responses */
+#define CARPCTL_MAXID 6
+
+#define CARPCTL_NAMES { \
+ { 0, 0 }, \
+ { "allow", CTLTYPE_INT }, \
+ { "preempt", CTLTYPE_INT }, \
+ { "log", CTLTYPE_INT }, \
+ { "stats", CTLTYPE_STRUCT }, \
+ { "arpbalance", CTLTYPE_INT }, \
+}
+
+#ifdef _KERNEL
+void carp_carpdev_state(void *);
+void carp_input (struct mbuf *, int);
+int carp6_input (struct mbuf **, int *, int);
+int carp_output (struct ifnet *, struct mbuf *, struct sockaddr *,
+ struct rtentry *);
+int carp_iamatch (void *, struct in_ifaddr *, struct in_addr *,
+ u_int8_t **);
+struct ifaddr *carp_iamatch6(void *, struct in6_addr *);
+void *carp_macmatch6(void *, struct mbuf *, const struct in6_addr *);
+struct ifnet *carp_forus (void *, void *);
+#endif
+#endif /* _IP_CARP_H */
diff --git a/sys/netinet/ip_var.h b/sys/netinet/ip_var.h
index 6c2809f..31da470 100644
--- a/sys/netinet/ip_var.h
+++ b/sys/netinet/ip_var.h
@@ -115,6 +115,7 @@ struct ip_moptions {
u_char imo_multicast_ttl; /* TTL for outgoing multicasts */
u_char imo_multicast_loop; /* 1 => hear sends if a member */
u_short imo_num_memberships; /* no. memberships this socket */
+ u_short imo_max_memberships; /* max memberships this socket */
struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
u_long imo_multicast_vif; /* vif num outgoing multicasts */
};
diff --git a/sys/netinet6/in6.c b/sys/netinet6/in6.c
index ae76439..f84087b 100644
--- a/sys/netinet6/in6.c
+++ b/sys/netinet6/in6.c
@@ -231,7 +231,7 @@ done:
* rely on the cloning mechanism from the corresponding interface route
* any more.
*/
-static void
+void
in6_ifaddloop(struct ifaddr *ifa)
{
struct rtentry *rt;
@@ -249,7 +249,7 @@ in6_ifaddloop(struct ifaddr *ifa)
* Remove loopback rtentry of ownaddr generated by in6_ifaddloop(),
* if it exists.
*/
-static void
+void
in6_ifremloop(struct ifaddr *ifa)
{
struct in6_ifaddr *ia;
@@ -1614,6 +1614,39 @@ in6_ifinit(struct ifnet *ifp, struct in6
return (error);
}
+struct in6_multi_mship *
+in6_joingroup(ifp, addr, errorp)
+ struct ifnet *ifp;
+ struct in6_addr *addr;
+ int *errorp;
+{
+ struct in6_multi_mship *imm;
+
+ imm = kmalloc(sizeof(*imm), M_IPMADDR, M_NOWAIT);
+ if (!imm) {
+ *errorp = ENOBUFS;
+ return NULL;
+ }
+ imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp);
+ if (!imm->i6mm_maddr) {
+ /* *errorp is alrady set */
+ kfree(imm, M_IPMADDR);
+ return NULL;
+ }
+ return imm;
+}
+
+int
+in6_leavegroup(imm)
+ struct in6_multi_mship *imm;
+{
+
+ if (imm->i6mm_maddr)
+ in6_delmulti(imm->i6mm_maddr);
+ kfree(imm, M_IPMADDR);
+ return 0;
+}
+
/*
* Add an address to the list of IP6 multicast addresses for a
* given interface.
diff --git a/sys/netinet6/in6_ifattach.c b/sys/netinet6/in6_ifattach.c
index 1e0bd15..94833c6 100644
--- a/sys/netinet6/in6_ifattach.c
+++ b/sys/netinet6/in6_ifattach.c
@@ -714,6 +714,7 @@ in6_ifattach(struct ifnet *ifp,
#endif
case IFT_PFLOG:
case IFT_PFSYNC:
+ case IFT_CARP:
return;
}
diff --git a/sys/netinet6/in6_proto.c b/sys/netinet6/in6_proto.c
index 1434cca..f2b430b 100644
--- a/sys/netinet6/in6_proto.c
+++ b/sys/netinet6/in6_proto.c
@@ -69,6 +69,7 @@
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
+#include "opt_carp.h"
#include <sys/param.h>
#include <sys/socket.h>
@@ -140,6 +141,11 @@
#include <net/net_osdep.h>
+#ifdef CARP
+#include <netinet/ip_carp.h>
+#endif
+
+
/*
* TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
*/
@@ -247,6 +253,15 @@ struct ip6protosw inet6sw[] = {
0, 0, 0, 0,
&rip6_usrreqs
},
+#ifdef CARP
+{ SOCK_RAW, &inet6domain, IPPROTO_CARP, PR_ATOMIC|PR_ADDR,
+ carp6_input, rip6_output, 0, rip6_ctloutput,
+ 0,
+ 0, 0, 0, 0,
+ &rip6_usrreqs
+},
+#endif /* CARP */
+
/* raw wildcard */
{ SOCK_RAW, &inet6domain, 0, PR_ATOMIC|PR_ADDR,
rip6_input, rip6_output, 0, rip6_ctloutput,
diff --git a/sys/netinet6/in6_var.h b/sys/netinet6/in6_var.h
index 6420634..cbfe2cb 100644
--- a/sys/netinet6/in6_var.h
+++ b/sys/netinet6/in6_var.h
@@ -585,6 +585,9 @@ do { \
struct in6_multi *in6_addmulti (struct in6_addr *, struct ifnet *,
int *);
void in6_delmulti (struct in6_multi *);
+struct in6_multi_mship *in6_joingroup(struct ifnet *, struct in6_addr *, int *);
+int in6_leavegroup(struct in6_multi_mship *);
+
extern int in6_ifindex2scopeid (int);
extern int in6_mask2len (struct in6_addr *, u_char *);
extern void in6_len2mask (struct in6_addr *, int);
@@ -615,6 +618,8 @@ int in6_prefix_ioctl (struct socket *so,
int in6_prefix_add_ifid (int iilen, struct in6_ifaddr *ia);
void in6_prefix_remove_ifid (int iilen, struct in6_ifaddr *ia);
void in6_purgeprefix (struct ifnet *);
+void in6_ifremloop(struct ifaddr *);
+void in6_ifaddloop(struct ifaddr *);
int in6_is_addr_deprecated (struct sockaddr_in6 *);
struct inpcb;
diff --git a/sys/netinet6/nd6.c b/sys/netinet6/nd6.c
index 801ec0c..e295fa5 100644
--- a/sys/netinet6/nd6.c
+++ b/sys/netinet6/nd6.c
@@ -1994,6 +1994,9 @@ nd6_need_cache(struct ifnet *ifp)
#ifdef IFT_IEEE80211
case IFT_IEEE80211:
#endif
+#ifdef IFT_CARP
+ case IFT_CARP:
+#endif
case IFT_GIF: /* XXX need more cases? */
return (1);
default:
diff --git a/sys/netinet6/nd6_nbr.c b/sys/netinet6/nd6_nbr.c
index 04f051b..4c70301 100644
--- a/sys/netinet6/nd6_nbr.c
+++ b/sys/netinet6/nd6_nbr.c
@@ -34,6 +34,7 @@
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
+#include "opt_carp.h"
#include <sys/param.h>
#include <sys/systm.h>
@@ -71,6 +72,11 @@
#include <net/net_osdep.h>
+#ifdef CARP
+#include <netinet/ip_carp.h>
+#endif
+
+
#define SDL(s) ((struct sockaddr_dl *)s)
struct dadq;
@@ -102,7 +108,7 @@ nd6_ns_input(struct mbuf *m, int off, in
struct in6_addr taddr6;
struct in6_addr myaddr6;
char *lladdr = NULL;
- struct ifaddr *ifa;
+ struct ifaddr *ifa = NULL;
int lladdrlen = 0;
int anycast = 0, proxy = 0, tentative = 0;
int tlladdr;
@@ -201,7 +207,14 @@ nd6_ns_input(struct mbuf *m, int off, in
* (3) "tentative" address on which DAD is being performed.
*/
/* (1) and (3) check. */
+#ifdef CARP
+ if (ifp->if_carp)
+ ifa = carp_iamatch6(ifp->if_carp, &taddr6);
+ if (!ifa)
+ ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
+#else
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
+#endif
/* (2) check. */
if (!ifa) {
@@ -895,9 +908,16 @@ nd6_na_output(struct ifnet *ifp, const s
* lladdr in sdl0. If we are not proxying (sending NA for
* my address) use lladdr configured for the interface.
*/
- if (sdl0 == NULL)
+ if (sdl0 == NULL) {
+#ifdef CARP
+ if (ifp->if_carp)
+ mac = carp_macmatch6(ifp->if_carp, m, taddr6);
+ if (mac == NULL)
+ mac = nd6_ifptomac(ifp);
+#else
mac = nd6_ifptomac(ifp);
- else if (sdl0->sa_family == AF_LINK) {
+#endif
+ } else if (sdl0->sa_family == AF_LINK) {
struct sockaddr_dl *sdl;
sdl = (struct sockaddr_dl *)sdl0;
if (sdl->sdl_alen == ifp->if_addrlen)
@@ -949,6 +969,9 @@ nd6_ifptomac(struct ifnet *ifp)
#ifdef IFT_IEEE80211
case IFT_IEEE80211:
#endif
+#ifdef IFT_CARP
+ case IFT_CARP:
+#endif
return ((caddr_t)(ifp + 1));
break;
default:
diff --git a/sys/netinet6/scope6.c b/sys/netinet6/scope6.c
index 96b0891..2957c58 100644
--- a/sys/netinet6/scope6.c
+++ b/sys/netinet6/scope6.c
@@ -296,3 +296,76 @@ scope6_addr2default(struct in6_addr *add
return (sid_default.s6id_list[in6_addrscope(addr)]);
}
+
+/*
+ * Determine the appropriate scope zone ID for in6 and ifp. If ret_id is
+ * non NULL, it is set to the zone ID. If the zone ID needs to be embedded
+ * in the in6_addr structure, in6 will be modified.
+ */
+int
+in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id)
+{
+ int scope;
+ u_int32_t zoneid = 0;
+ struct scope6_id *sid;
+
+ lwkt_serialize_enter(ifp->if_serializer);
+
+ sid = SID(ifp);
+
+#ifdef DIAGNOSTIC
+ if (sid == NULL) { /* should not happen */
+ panic("in6_setscope: scope array is NULL");
+ /* NOTREACHED */
+ }
+#endif
+
+ /*
+ * special case: the loopback address can only belong to a loopback
+ * interface.
+ */
+ if (IN6_IS_ADDR_LOOPBACK(in6)) {
+ if (!(ifp->if_flags & IFF_LOOPBACK)) {
+ lwkt_serialize_exit(ifp->if_serializer);
+ return (EINVAL);
+ } else {
+ if (ret_id != NULL)
+ *ret_id = 0; /* there's no ambiguity */
+ lwkt_serialize_exit(ifp->if_serializer);
+ return (0);
+ }
+ }
+
+ scope = in6_addrscope(in6);
+
+ switch (scope) {
+ case IPV6_ADDR_SCOPE_NODELOCAL: /* should be interface index */
+ zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_NODELOCAL];
+ break;
+
+ case IPV6_ADDR_SCOPE_LINKLOCAL:
+ zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL];
+ break;
+
+ case IPV6_ADDR_SCOPE_SITELOCAL:
+ zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL];
+ break;
+
+ case IPV6_ADDR_SCOPE_ORGLOCAL:
+ zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL];
+ break;
+
+ default:
+ zoneid = 0; /* XXX: treat as global. */
+ break;
+ }
+ lwkt_serialize_exit(ifp->if_serializer);
+
+ if (ret_id != NULL)
+ *ret_id = zoneid;
+
+ if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_NODELOCAL(in6) )
+ in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */
+
+ return (0);
+}
diff --git a/sys/netinet6/scope6_var.h b/sys/netinet6/scope6_var.h
index 57c84c4..62427e3 100644
--- a/sys/netinet6/scope6_var.h
+++ b/sys/netinet6/scope6_var.h
@@ -65,6 +65,7 @@ void scope6_setdefault (struct ifnet *);
int scope6_get_default (struct scope6_id *);
u_int32_t scope6_in6_addrscope (struct in6_addr *);
u_int32_t scope6_addr2default (struct in6_addr *);
+int in6_setscope __P((struct in6_addr *, struct ifnet *, u_int32_t *));
#endif /* _KERNEL */
diff --git a/sys/sys/mbuf.h b/sys/sys/mbuf.h
index 6391553..0774545 100644
--- a/sys/sys/mbuf.h
+++ b/sys/sys/mbuf.h
@@ -560,6 +560,7 @@ m_getb(int len, int how, int type, int f
/* struct ip6aux */
#define PACKET_TAG_IPFW_DIVERT 9 /* divert info */
/* uint16_t */
+#define PACKET_TAG_CARP 28 /* CARP info */
/*
* As a temporary and low impact solution to replace the even uglier
diff --git a/usr.bin/netstat/inet.c b/usr.bin/netstat/inet.c
index 1158082..47e76c7 100644
--- a/usr.bin/netstat/inet.c
+++ b/usr.bin/netstat/inet.c
@@ -47,6 +47,7 @@
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
+#include <netinet/ip_carp.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif /* INET6 */
@@ -584,6 +585,50 @@ udp_stats(u_long off __unused, char *nam
#undef p1a
}
+/*
+ * Dump CARP statistics structure.
+ */
+void
+carp_stats(u_long off, const char *name, int af1 __unused)
+{
+ struct carpstats carpstat, zerostat;
+ size_t len = sizeof(struct carpstats);
+
+ if (zflag)
+ memset(&zerostat, 0, len);
+ if (sysctlbyname("net.inet.carp.stats", &carpstat, &len,
+ zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
+ warn("sysctl: net.inet.carp.stats");
+ return;
+ }
+
+ printf("%s:\n", name);
+
+#define p(f, m) if (carpstat.f || sflag <= 1) \
+ printf(m, (unsigned long long)carpstat.f, plural((int)carpstat.f))
+#define p2(f, m) if (carpstat.f || sflag <= 1) \
+ printf(m, (unsigned long long)carpstat.f)
+
+ p(carps_ipackets, "\t%llu packet%s received (IPv4)\n");
+ p(carps_ipackets6, "\t%llu packet%s received (IPv6)\n");
+ p(carps_badttl, "\t\t%llu packet%s discarded for wrong TTL\n");
+ p(carps_hdrops, "\t\t%llu packet%s shorter than header\n");
+ p(carps_badsum, "\t\t%llu discarded for bad checksum%s\n");
+ p(carps_badver, "\t\t%llu discarded packet%s with a bad version\n");
+ p2(carps_badlen, "\t\t%llu discarded because packet too short\n");
+ p2(carps_badauth, "\t\t%llu discarded for bad authentication\n");
+ p2(carps_badvhid, "\t\t%llu discarded for bad vhid\n");
+ p2(carps_badaddrs, "\t\t%llu discarded because of a bad address list\n");
+ p(carps_opackets, "\t%llu packet%s sent (IPv4)\n");
+ p(carps_opackets6, "\t%llu packet%s sent (IPv6)\n");
+ p2(carps_onomem, "\t\t%llu send failed due to mbuf memory error\n");
+#if notyet
+ p(carps_ostates, "\t\t%s state update%s sent\n");
+#endif
+#undef p
+#undef p2
+}
+
/*
* Dump IP statistics structure.
*/
diff --git a/usr.bin/netstat/main.c b/usr.bin/netstat/main.c
index b487811..2004d93 100644
--- a/usr.bin/netstat/main.c
+++ b/usr.bin/netstat/main.c
@@ -148,6 +148,8 @@ static struct nlist nl[] = {
{ "_rttrash" },
#define N_NCPUS 43
{ "_ncpus" },
+#define N_CARPSTAT 44
+ { "_carpstats" },
{ "" },
};
@@ -179,6 +181,8 @@ struct protox {
{ -1, N_IPSECSTAT, 1, 0,
ipsec_stats, NULL, "ipsec", 0},
#endif
+ { -1, N_CARPSTAT, 1, 0,
+ carp_stats, NULL, "carp", 0},
{ -1, -1, 0, 0,
0, NULL, 0 }
};
diff --git a/usr.bin/netstat/netstat.h b/usr.bin/netstat/netstat.h
index f0329cd..b7cd79e 100644
--- a/usr.bin/netstat/netstat.h
+++ b/usr.bin/netstat/netstat.h
@@ -73,6 +73,7 @@ void ip_stats (u_long, char *, int);
void icmp_stats (u_long, char *, int);
void igmp_stats (u_long, char *, int);
void pim_stats (u_long, char *, int);
+void carp_stats (u_long, const char *, int);
#ifdef IPSEC
void ipsec_stats (u_long, char *, int);
#endif
- Follow-Ups:
- Re: Second patch for CARP
- From: Sascha Wildner <saw@online.de>
- Re: Second patch for CARP
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