Author: ae
Date: Sun Apr 14 12:28:41 2019
New Revision: 346209
URL: https://svnweb.freebsd.org/changeset/base/346209
Log:
MFC r339542:
Retire IPFIREWALL_NAT64_DIRECT_OUTPUT kernel option. And add ability
to switch the output method in run-time. Also document some sysctl
variables that can by changed for NAT64 module.
NAT64 had compile time option IPFIREWALL_NAT64_DIRECT_OUTPUT to use
if_output directly from nat64 module. By default is used netisr based
output method. Now both methods can be used, but they require different
handling by rules.
Obtained from: Yandex LLC
Sponsored by: Yandex LLC
Differential Revision: https://reviews.freebsd.org/D16647
Modified:
stable/11/sbin/ipfw/ipfw.8
stable/11/sys/conf/options
stable/11/sys/modules/ipfw_nat64/Makefile
stable/11/sys/netpfil/ipfw/nat64/ip_fw_nat64.c
stable/11/sys/netpfil/ipfw/nat64/nat64_translate.c
stable/11/sys/netpfil/ipfw/nat64/nat64_translate.h
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sbin/ipfw/ipfw.8
==============================================================================
--- stable/11/sbin/ipfw/ipfw.8 Sun Apr 14 12:14:25 2019 (r346208)
+++ stable/11/sbin/ipfw/ipfw.8 Sun Apr 14 12:28:41 2019 (r346209)
@@ -3304,9 +3304,14 @@ Make sure that ND6 neighbor solicitation (ICMPv6 type
advertisement (ICMPv6 type 136) messages will not be handled by translation
rules.
.Pp
-After translation NAT64 translator sends packets through corresponding netisr
-queue.
+After translation NAT64 translator by default sends packets through
+corresponding netisr queue.
Thus translator host should be configured as IPv4 and IPv6 router.
+Also this means, that a packet is handled by firewall twice.
+First time an original packet is handled and consumed by translator,
+and then it is handled again as translated packet.
+This behavior can be changed by sysctl variable
+.Va net.inet.ip.fw.nat64_direct_output .
.Pp
The stateful NAT64 configuration command is the following:
.Bd -ragged -offset indent
@@ -3929,6 +3934,41 @@ Default is no.
Controls whether bridged packets are passed to
.Nm .
Default is no.
+.It Va net.inet.ip.fw.nat64_allow_private : No 0
+Defines how
+.Nm nat64
+handles private IPv4 addresses:
+.Bl -tag -width indent
+.It Cm 0
+Packets with private IPv4 will not be handled by translator
+.It Cm 1
+Translator will accept and process packets with private IPv4 addresses.
+.El
+.It Va net.inet.ip.fw.nat64_debug : No 0
+Controls debugging messages produced by
+.Nm ipfw_nat64
+module.
+.It Va net.inet.ip.fw.nat64_direct_output : No 0
+Controls the output method used by
+.Nm ipfw_nat64
+module:
+.Bl -tag -width indent
+.It Cm 0
+A packet is handled by
+.Nm ipfw
+twice.
+First time an original packet is handled by
+.Nm ipfw
+and consumed by
+.Nm ipfw_nat64
+translator.
+Then translated packet is queued via netisr to input processing again.
+.It Cm 1
+A packet is handled by
+.Nm ipfw
+only once, and after translation it will be pushed directly to outgoing
+interface.
+.El
.El
.Sh INTERNAL DIAGNOSTICS
There are some commands that may be useful to understand current state
Modified: stable/11/sys/conf/options
==============================================================================
--- stable/11/sys/conf/options Sun Apr 14 12:14:25 2019 (r346208)
+++ stable/11/sys/conf/options Sun Apr 14 12:28:41 2019 (r346209)
@@ -422,7 +422,6 @@ IPFIREWALL opt_ipfw.h
IPFIREWALL_DEFAULT_TO_ACCEPT opt_ipfw.h
IPFIREWALL_NAT opt_ipfw.h
IPFIREWALL_NAT64 opt_ipfw.h
-IPFIREWALL_NAT64_DIRECT_OUTPUT opt_ipfw.h
IPFIREWALL_NPTV6 opt_ipfw.h
IPFIREWALL_VERBOSE opt_ipfw.h
IPFIREWALL_VERBOSE_LIMIT opt_ipfw.h
Modified: stable/11/sys/modules/ipfw_nat64/Makefile
==============================================================================
--- stable/11/sys/modules/ipfw_nat64/Makefile Sun Apr 14 12:14:25 2019
(r346208)
+++ stable/11/sys/modules/ipfw_nat64/Makefile Sun Apr 14 12:28:41 2019
(r346209)
@@ -6,8 +6,5 @@ KMOD= ipfw_nat64
SRCS= ip_fw_nat64.c nat64_translate.c
SRCS+= nat64lsn.c nat64lsn_control.c
SRCS+= nat64stl.c nat64stl_control.c
-SRCS+= opt_ipfw.h
-
-#CFLAGS+= -DIPFIREWALL_NAT64_DIRECT_OUTPUT
.include <bsd.kmod.mk>
Modified: stable/11/sys/netpfil/ipfw/nat64/ip_fw_nat64.c
==============================================================================
--- stable/11/sys/netpfil/ipfw/nat64/ip_fw_nat64.c Sun Apr 14 12:14:25
2019 (r346208)
+++ stable/11/sys/netpfil/ipfw/nat64/ip_fw_nat64.c Sun Apr 14 12:28:41
2019 (r346209)
@@ -48,6 +48,7 @@ __FBSDID("$FreeBSD$");
#include <netpfil/ipfw/ip_fw_private.h>
#include "ip_fw_nat64.h"
+#include "nat64_translate.h"
VNET_DEFINE(int, nat64_debug) = 0;
VNET_DEFINE(int, nat64_allow_private) = 0;
@@ -56,8 +57,26 @@ SYSCTL_DECL(_net_inet_ip_fw);
SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, nat64_debug, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(nat64_debug), 0, "Debug level for NAT64 module");
SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, nat64_allow_private,
- CTLFLAG_VNET |CTLFLAG_RW, &VNET_NAME(nat64_allow_private), 0,
+ CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nat64_allow_private), 0,
"Allow use of non-global IPv4 addresses with NAT64");
+
+static int
+sysctl_direct_output(SYSCTL_HANDLER_ARGS)
+{
+ uint32_t value;
+ int error;
+
+ value = nat64_get_output_method();
+ error = sysctl_handle_32(oidp, &value, 0, req);
+ /* Read operation or some error */
+ if ((error != 0) || (req->newptr == NULL))
+ return (error);
+ nat64_set_output_method(value);
+ return (0);
+}
+SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, nat64_direct_output,
+ CTLFLAG_VNET | CTLTYPE_U32 | CTLFLAG_RW, 0, 0, sysctl_direct_output, "IU",
+ "Use if_output directly instead of deffered netisr-based processing");
static int
vnet_ipfw_nat64_init(const void *arg __unused)
Modified: stable/11/sys/netpfil/ipfw/nat64/nat64_translate.c
==============================================================================
--- stable/11/sys/netpfil/ipfw/nat64/nat64_translate.c Sun Apr 14 12:14:25
2019 (r346208)
+++ stable/11/sys/netpfil/ipfw/nat64/nat64_translate.c Sun Apr 14 12:28:41
2019 (r346209)
@@ -25,8 +25,6 @@
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-#include "opt_ipfw.h"
-
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
@@ -71,6 +69,53 @@ __FBSDID("$FreeBSD$");
#include "ip_fw_nat64.h"
#include "nat64_translate.h"
+
+typedef int (*nat64_output_t)(struct ifnet *, struct mbuf *,
+ struct sockaddr *, struct nat64_counters *, void *);
+typedef int (*nat64_output_one_t)(struct mbuf *, struct nat64_counters *,
+ void *);
+
+static int nat64_find_route4(struct nhop4_basic *, struct sockaddr_in *,
+ struct mbuf *);
+static int nat64_find_route6(struct nhop6_basic *, struct sockaddr_in6 *,
+ struct mbuf *);
+static int nat64_output_one(struct mbuf *, struct nat64_counters *, void *);
+static int nat64_output(struct ifnet *, struct mbuf *, struct sockaddr *,
+ struct nat64_counters *, void *);
+static int nat64_direct_output_one(struct mbuf *, struct nat64_counters *,
+ void *);
+static int nat64_direct_output(struct ifnet *, struct mbuf *,
+ struct sockaddr *, struct nat64_counters *, void *);
+
+struct nat64_methods {
+ nat64_output_t output;
+ nat64_output_one_t output_one;
+};
+static const struct nat64_methods nat64_netisr = {
+ .output = nat64_output,
+ .output_one = nat64_output_one
+};
+static const struct nat64_methods nat64_direct = {
+ .output = nat64_direct_output,
+ .output_one = nat64_direct_output_one
+};
+static VNET_DEFINE(const struct nat64_methods *, nat64out) = &nat64_netisr;
+#define V_nat64out VNET(nat64out)
+
+void
+nat64_set_output_method(int direct)
+{
+
+ V_nat64out = direct != 0 ? &nat64_direct: &nat64_netisr;
+}
+
+int
+nat64_get_output_method(void)
+{
+
+ return (V_nat64out == &nat64_direct ? 1: 0);
+}
+
static void
nat64_log(struct pfloghdr *logdata, struct mbuf *m, sa_family_t family)
{
@@ -80,14 +125,8 @@ nat64_log(struct pfloghdr *logdata, struct mbuf *m, sa
ipfw_bpf_mtap2(logdata, PFLOG_HDRLEN, m);
}
-#ifdef IPFIREWALL_NAT64_DIRECT_OUTPUT
-static NAT64NOINLINE int nat64_find_route4(struct nhop4_basic *,
- struct sockaddr_in *, struct mbuf *);
-static NAT64NOINLINE int nat64_find_route6(struct nhop6_basic *,
- struct sockaddr_in6 *, struct mbuf *);
-
-static NAT64NOINLINE int
-nat64_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
+static int
+nat64_direct_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
struct nat64_counters *stats, void *logdata)
{
int error;
@@ -100,8 +139,9 @@ nat64_output(struct ifnet *ifp, struct mbuf *m, struct
return (error);
}
-static NAT64NOINLINE int
-nat64_output_one(struct mbuf *m, struct nat64_counters *stats, void *logdata)
+static int
+nat64_direct_output_one(struct mbuf *m, struct nat64_counters *stats,
+ void *logdata)
{
struct nhop6_basic nh6;
struct nhop4_basic nh4;
@@ -153,8 +193,8 @@ nat64_output_one(struct mbuf *m, struct nat64_counters
NAT64STAT_INC(stats, oerrors);
return (error);
}
-#else /* !IPFIREWALL_NAT64_DIRECT_OUTPUT */
-static NAT64NOINLINE int
+
+static int
nat64_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
struct nat64_counters *stats, void *logdata)
{
@@ -187,13 +227,12 @@ nat64_output(struct ifnet *ifp, struct mbuf *m, struct
return (ret);
}
-static NAT64NOINLINE int
+static int
nat64_output_one(struct mbuf *m, struct nat64_counters *stats, void *logdata)
{
return (nat64_output(NULL, m, NULL, stats, logdata));
}
-#endif /* !IPFIREWALL_NAT64_DIRECT_OUTPUT */
/*
* Check the given IPv6 prefix and length according to RFC6052:
@@ -426,12 +465,10 @@ nat64_init_ip4hdr(const struct ip6_hdr *ip6, const str
ip->ip_hl = sizeof(*ip) >> 2;
ip->ip_tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
ip->ip_len = htons(sizeof(*ip) + plen);
-#ifdef IPFIREWALL_NAT64_DIRECT_OUTPUT
- ip->ip_ttl = ip6->ip6_hlim - IPV6_HLIMDEC;
-#else
- /* Forwarding code will decrement TTL. */
ip->ip_ttl = ip6->ip6_hlim;
-#endif
+ /* Forwarding code will decrement TTL for netisr based output. */
+ if (V_nat64out == &nat64_direct)
+ ip->ip_ttl -= IPV6_HLIMDEC;
ip->ip_sum = 0;
ip->ip_p = (proto == IPPROTO_ICMPV6) ? IPPROTO_ICMP: proto;
ip_fillid(ip);
@@ -649,7 +686,7 @@ nat64_icmp6_reflect(struct mbuf *m, uint8_t type, uint
icmp6->icmp6_cksum = in6_cksum(n, IPPROTO_ICMPV6,
sizeof(struct ip6_hdr), plen);
m_freem(m);
- nat64_output_one(n, stats, logdata);
+ V_nat64out->output_one(n, stats, logdata);
return;
freeit:
NAT64STAT_INC(stats, dropped);
@@ -752,7 +789,7 @@ nat64_icmp_reflect(struct mbuf *m, uint8_t type,
icmp->icmp_cksum = in_cksum_skip(n, sizeof(struct ip) + plen,
sizeof(struct ip));
m_freem(m);
- nat64_output_one(n, stats, logdata);
+ V_nat64out->output_one(n, stats, logdata);
return;
freeit:
NAT64STAT_INC(stats, dropped);
@@ -1169,12 +1206,10 @@ nat64_do_handle_ip4(struct mbuf *m, struct in6_addr *s
ip6.ip6_flow = htonl(ip->ip_tos << 20);
ip6.ip6_vfc |= IPV6_VERSION;
-#ifdef IPFIREWALL_NAT64_DIRECT_OUTPUT
- ip6.ip6_hlim = ip->ip_ttl - IPTTLDEC;
-#else
- /* Forwarding code will decrement HLIM. */
ip6.ip6_hlim = ip->ip_ttl;
-#endif
+ /* Forwarding code will decrement TTL for netisr based output. */
+ if (V_nat64out == &nat64_direct)
+ ip6.ip6_hlim -= IPTTLDEC;
ip6.ip6_plen = htons(plen);
ip6.ip6_nxt = (proto == IPPROTO_ICMP) ? IPPROTO_ICMPV6: proto;
/* Convert checksums. */
@@ -1207,7 +1242,7 @@ nat64_do_handle_ip4(struct mbuf *m, struct in6_addr *s
mbufq_init(&mq, 255);
nat64_fragment6(&cfg->stats, &ip6, &mq, m, nh.nh_mtu, ip_id, ip_off);
while ((m = mbufq_dequeue(&mq)) != NULL) {
- if (nat64_output(nh.nh_ifp, m, (struct sockaddr *)&dst,
+ if (V_nat64out->output(nh.nh_ifp, m, (struct sockaddr *)&dst,
&cfg->stats, logdata) != 0)
break;
NAT64STAT_INC(&cfg->stats, opcnt46);
@@ -1417,9 +1452,8 @@ nat64_handle_icmp6(struct mbuf *m, int hlen, uint32_t
ip.ip_dst.s_addr = aaddr;
ip.ip_src.s_addr = nat64_extract_ip4(cfg, &ip6i->ip6_src);
/* XXX: Make fake ulp header */
-#ifdef IPFIREWALL_NAT64_DIRECT_OUTPUT
- ip6i->ip6_hlim += IPV6_HLIMDEC; /* init_ip4hdr will decrement it */
-#endif
+ if (V_nat64out == &nat64_direct) /* init_ip4hdr will decrement it */
+ ip6i->ip6_hlim += IPV6_HLIMDEC;
nat64_init_ip4hdr(ip6i, ip6f, plen, proto, &ip);
m_adj(m, hlen - sizeof(struct ip));
bcopy(&ip, mtod(m, void *), sizeof(ip));
@@ -1589,7 +1623,7 @@ nat64_do_handle_ip6(struct mbuf *m, uint32_t aaddr, ui
m_adj(m, hlen - sizeof(ip));
bcopy(&ip, mtod(m, void *), sizeof(ip));
- if (nat64_output(nh.nh_ifp, m, (struct sockaddr *)&dst,
+ if (V_nat64out->output(nh.nh_ifp, m, (struct sockaddr *)&dst,
&cfg->stats, logdata) == 0)
NAT64STAT_INC(&cfg->stats, opcnt64);
return (NAT64RETURN);
Modified: stable/11/sys/netpfil/ipfw/nat64/nat64_translate.h
==============================================================================
--- stable/11/sys/netpfil/ipfw/nat64/nat64_translate.h Sun Apr 14 12:14:25
2019 (r346208)
+++ stable/11/sys/netpfil/ipfw/nat64/nat64_translate.h Sun Apr 14 12:28:41
2019 (r346209)
@@ -1,6 +1,6 @@
/*-
- * Copyright (c) 2015-2016 Yandex LLC
- * Copyright (c) 2015-2016 Andrey V. Elsukov <a...@freebsd.org>
+ * Copyright (c) 2015-2018 Yandex LLC
+ * Copyright (c) 2015-2018 Andrey V. Elsukov <a...@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -141,6 +141,9 @@ void nat64_embed_ip4(const struct nat64_config *cfg, i
struct in6_addr *ip6);
in_addr_t nat64_extract_ip4(const struct nat64_config *cfg,
const struct in6_addr *ip6);
+
+void nat64_set_output_method(int);
+int nat64_get_output_method(void);
#endif
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