Make ipfw0 logging pseudo-interface clonable. It can be created automatically
by $firewall_logif rc.conf(5) variable at boot time or manually by ifconfig(8) after a boot. Discussed on: freebsd-ipfw@
This commit is contained in:
Hiroki Sato
parent
ba7de9be0d
commit
8efbd296e0
@ -123,6 +123,7 @@ firewall_script="/etc/rc.firewall" # Which script to run to set up the firewall
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firewall_type="UNKNOWN" # Firewall type (see /etc/rc.firewall)
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firewall_quiet="NO" # Set to YES to suppress rule display
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firewall_logging="NO" # Set to YES to enable events logging
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firewall_logif="NO" # Set to YES to create logging-pseudo interface
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firewall_flags="" # Flags passed to ipfw when type is a file
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firewall_coscripts="" # List of executables/scripts to run after
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# firewall starts/stops
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@ -57,6 +57,10 @@ ipfw_start()
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echo 'Firewall logging enabled.'
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sysctl net.inet.ip.fw.verbose=1 >/dev/null
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fi
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if checkyesno firewall_logif; then
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ifconfig ipfw0 create
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echo 'Firewall logging pseudo-interface (ipfw0) created.'
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fi
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}
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ipfw_poststart()
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@ -1,7 +1,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 3, 2012
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.Dd July 9, 2012
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.Dt IPFW 8
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.Os
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.Sh NAME
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@ -560,7 +560,22 @@ is set to 0 (default), one can use
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.Xr bpf 4
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attached to the
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.Li ipfw0
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pseudo interface. There is no overhead if no
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pseudo interface.
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This pseudo interface can be created after a boot
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manually by using the following command:
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.Bd -literal -offset indent
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# ifconfig ipfw0 create
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.Ed
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.Pp
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Or, automatically at boot time by adding the following
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line to the
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.Xr rc.conf 5
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file:
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.Bd -literal -offset indent
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firewall_logif="YES"
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.Ed
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.Pp
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There is no overhead if no
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.Xr bpf 4
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is attached to the pseudo interface.
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.Pp
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@ -24,7 +24,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 6, 2012
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.Dd July 9, 2012
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.Dt RC.CONF 5
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.Os
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.Sh NAME
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@ -501,6 +501,16 @@ to enable firewall event logging.
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This is equivalent to the
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.Dv IPFIREWALL_VERBOSE
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kernel option.
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.It Va firewall_logif
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.Pq Vt bool
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Set to
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.Dq Li YES
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to create pseudo interface
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.Li ipfw0
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for logging.
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For more details, see
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.Xr ipfw 8
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manual page.
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.It Va firewall_flags
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.Pq Vt str
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Flags passed to
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@ -44,8 +44,11 @@ __FBSDID("$FreeBSD$");
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/lock.h>
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#include <sys/rwlock.h>
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#include <net/ethernet.h> /* for ETHERTYPE_IP */
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#include <net/if.h>
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#include <net/if_clone.h>
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#include <net/vnet.h>
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#include <net/if_types.h> /* for IFT_ETHER */
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#include <net/bpf.h> /* for BPF */
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@ -90,6 +93,15 @@ ipfw_log_bpf(int onoff)
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}
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#else /* !WITHOUT_BPF */
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static struct ifnet *log_if; /* hook to attach to bpf */
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static struct rwlock log_if_lock;
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#define LOGIF_LOCK_INIT(x) rw_init(&log_if_lock, "ipfw log_if lock")
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#define LOGIF_LOCK_DESTROY(x) rw_destroy(&log_if_lock)
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#define LOGIF_RLOCK(x) rw_rlock(&log_if_lock)
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#define LOGIF_RUNLOCK(x) rw_runlock(&log_if_lock)
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#define LOGIF_WLOCK(x) rw_wlock(&log_if_lock)
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#define LOGIF_WUNLOCK(x) rw_wunlock(&log_if_lock)
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#define IPFWNAME "ipfw"
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/* we use this dummy function for all ifnet callbacks */
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static int
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@ -116,18 +128,38 @@ ipfw_log_start(struct ifnet* ifp)
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static const u_char ipfwbroadcastaddr[6] =
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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void
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ipfw_log_bpf(int onoff)
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static int
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ipfw_log_clone_match(struct if_clone *ifc, const char *name)
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{
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return (strncmp(name, IPFWNAME, sizeof(IPFWNAME) - 1) == 0);
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}
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static int
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ipfw_log_clone_create(struct if_clone *ifc, char *name, size_t len,
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caddr_t params)
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{
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int error;
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int unit;
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struct ifnet *ifp;
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if (onoff) {
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if (log_if)
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return;
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error = ifc_name2unit(name, &unit);
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if (error)
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return (error);
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error = ifc_alloc_unit(ifc, &unit);
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if (error)
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return (error);
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ifp = if_alloc(IFT_ETHER);
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if (ifp == NULL)
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return;
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if_initname(ifp, "ipfw", 0);
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if (ifp == NULL) {
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ifc_free_unit(ifc, unit);
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return (ENOSPC);
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}
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ifp->if_dname = IPFWNAME;
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ifp->if_dunit = unit;
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snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", IPFWNAME, unit);
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strlcpy(name, ifp->if_xname, len);
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ifp->if_mtu = 65536;
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ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST;
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ifp->if_init = (void *)log_dummy;
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@ -136,17 +168,65 @@ ipfw_log_bpf(int onoff)
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ifp->if_output = ipfw_log_output;
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ifp->if_addrlen = 6;
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ifp->if_hdrlen = 14;
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if_attach(ifp);
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ifp->if_broadcastaddr = ipfwbroadcastaddr;
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ifp->if_baudrate = IF_Mbps(10);
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bpfattach(ifp, DLT_EN10MB, 14);
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LOGIF_WLOCK();
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if (log_if == NULL)
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log_if = ifp;
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} else {
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if (log_if) {
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ether_ifdetach(log_if);
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if_free(log_if);
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else {
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LOGIF_WUNLOCK();
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if_free(ifp);
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ifc_free_unit(ifc, unit);
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return (EEXIST);
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}
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LOGIF_WUNLOCK();
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if_attach(ifp);
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bpfattach(ifp, DLT_EN10MB, 14);
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return (0);
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}
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static int
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ipfw_log_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
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{
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int unit;
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if (ifp == NULL)
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return (0);
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LOGIF_WLOCK();
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if (log_if != NULL && ifp == log_if)
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log_if = NULL;
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else {
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LOGIF_WUNLOCK();
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return (EINVAL);
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}
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LOGIF_WUNLOCK();
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unit = ifp->if_dunit;
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bpfdetach(ifp);
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if_detach(ifp);
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if_free(ifp);
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ifc_free_unit(ifc, unit);
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return (0);
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}
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static struct if_clone ipfw_log_cloner = IFC_CLONE_INITIALIZER(
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IPFWNAME, NULL, IF_MAXUNIT,
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NULL, ipfw_log_clone_match, ipfw_log_clone_create, ipfw_log_clone_destroy);
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void
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ipfw_log_bpf(int onoff)
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{
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if (onoff) {
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LOGIF_LOCK_INIT();
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if_clone_attach(&ipfw_log_cloner);
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} else {
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if_clone_detach(&ipfw_log_cloner);
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LOGIF_LOCK_DESTROY();
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}
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}
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#endif /* !WITHOUT_BPF */
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@ -166,9 +246,11 @@ ipfw_log(struct ip_fw *f, u_int hlen, struct ip_fw_args *args,
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if (V_fw_verbose == 0) {
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#ifndef WITHOUT_BPF
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if (log_if == NULL || log_if->if_bpf == NULL)
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LOGIF_RLOCK();
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if (log_if == NULL || log_if->if_bpf == NULL) {
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LOGIF_RUNLOCK();
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return;
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}
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if (args->eh) /* layer2, use orig hdr */
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BPF_MTAP2(log_if, args->eh, ETHER_HDR_LEN, m);
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@ -177,6 +259,7 @@ ipfw_log(struct ip_fw *f, u_int hlen, struct ip_fw_args *args,
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* more info in the header.
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*/
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BPF_MTAP2(log_if, "DDDDDDSSSSSS\x08\x00", ETHER_HDR_LEN, m);
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LOGIF_RUNLOCK();
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#endif /* !WITHOUT_BPF */
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return;
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}
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