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The module works together with ipfw(4) and implemented as its external
action module.
Stateless NAT64 registers external action with name nat64stl. This
keyword should be used to create NAT64 instance and to address this
instance in rules. Stateless NAT64 uses two lookup tables with mapped
IPv4->IPv6 and IPv6->IPv4 addresses to perform translation.
A configuration of instance should looks like this:
1. Create lookup tables:
# ipfw table T46 create type addr valtype ipv6
# ipfw table T64 create type addr valtype ipv4
2. Fill T46 and T64 tables.
3. Add rule to allow neighbor solicitation and advertisement:
# ipfw add allow icmp6 from any to any icmp6types 135,136
4. Create NAT64 instance:
# ipfw nat64stl NAT create table4 T46 table6 T64
5. Add rules that matches the traffic:
# ipfw add nat64stl NAT ip from any to table(T46)
# ipfw add nat64stl NAT ip from table(T64) to 64:ff9b::/96
6. Configure DNS64 for IPv6 clients and add route to 64:ff9b::/96
via NAT64 host.
Stateful NAT64 registers external action with name nat64lsn. The only
one option required to create nat64lsn instance - prefix4. It defines
the pool of IPv4 addresses used for translation.
A configuration of instance should looks like this:
1. Add rule to allow neighbor solicitation and advertisement:
# ipfw add allow icmp6 from any to any icmp6types 135,136
2. Create NAT64 instance:
# ipfw nat64lsn NAT create prefix4 A.B.C.D/28
3. Add rules that matches the traffic:
# ipfw add nat64lsn NAT ip from any to A.B.C.D/28
# ipfw add nat64lsn NAT ip6 from any to 64:ff9b::/96
4. Configure DNS64 for IPv6 clients and add route to 64:ff9b::/96
via NAT64 host.
Obtained from: Yandex LLC
Relnotes: yes
Sponsored by: Yandex LLC
Differential Revision: https://reviews.freebsd.org/D6434
155 lines
6.0 KiB
C
155 lines
6.0 KiB
C
/*-
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* Copyright (c) 2015 Yandex LLC
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* Copyright (c) 2015 Alexander V. Chernikov <melifaro@FreeBSD.org>
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* Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _NETINET6_IP_FW_NAT64_H_
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#define _NETINET6_IP_FW_NAT64_H_
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struct ipfw_nat64stl_stats {
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uint64_t opcnt64; /* 6to4 of packets translated */
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uint64_t opcnt46; /* 4to6 of packets translated */
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uint64_t ofrags; /* number of fragments generated */
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uint64_t ifrags; /* number of fragments received */
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uint64_t oerrors; /* number of output errors */
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uint64_t noroute4;
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uint64_t noroute6;
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uint64_t noproto; /* Protocol not supported */
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uint64_t nomem; /* mbuf allocation filed */
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uint64_t dropped; /* dropped due to some errors */
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};
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struct ipfw_nat64lsn_stats {
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uint64_t opcnt64; /* 6to4 of packets translated */
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uint64_t opcnt46; /* 4to6 of packets translated */
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uint64_t ofrags; /* number of fragments generated */
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uint64_t ifrags; /* number of fragments received */
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uint64_t oerrors; /* number of output errors */
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uint64_t noroute4;
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uint64_t noroute6;
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uint64_t noproto; /* Protocol not supported */
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uint64_t nomem; /* mbuf allocation filed */
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uint64_t dropped; /* dropped due to some errors */
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uint64_t nomatch4; /* No addr/port match */
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uint64_t jcalls; /* Number of job handler calls */
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uint64_t jrequests; /* Number of job requests */
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uint64_t jhostsreq; /* Number of job host requests */
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uint64_t jportreq; /* Number of portgroup requests */
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uint64_t jhostfails; /* Number of failed host allocs */
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uint64_t jportfails; /* Number of failed portgroup allocs */
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uint64_t jreinjected; /* Number of packets reinjected to q */
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uint64_t jmaxlen; /* Max queue length reached */
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uint64_t jnomem; /* No memory to alloc queue item */
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uint64_t screated; /* Number of states created */
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uint64_t sdeleted; /* Number of states deleted */
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uint64_t spgcreated; /* Number of portgroups created */
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uint64_t spgdeleted; /* Number of portgroups deleted */
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uint64_t hostcount; /* Number of hosts */
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uint64_t tcpchunks; /* Number of TCP chunks */
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uint64_t udpchunks; /* Number of UDP chunks */
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uint64_t icmpchunks; /* Number of ICMP chunks */
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uint64_t _reserved[4];
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};
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#define NAT64_LOG 0x0001 /* Enable logging via BPF */
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typedef struct _ipfw_nat64stl_cfg {
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char name[64]; /* NAT name */
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ipfw_obj_ntlv ntlv6; /* object name tlv */
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ipfw_obj_ntlv ntlv4; /* object name tlv */
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struct in6_addr prefix6; /* NAT64 prefix */
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uint8_t plen6; /* Prefix length */
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uint8_t set; /* Named instance set [0..31] */
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uint8_t spare[2];
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uint32_t flags;
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} ipfw_nat64stl_cfg;
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/*
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* NAT64LSN default configuration values
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*/
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#define NAT64LSN_MAX_PORTS 2048 /* Max number of ports per host */
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#define NAT64LSN_JMAXLEN 2048 /* Max outstanding requests. */
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#define NAT64LSN_TCP_SYN_AGE 10 /* State's TTL after SYN received. */
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#define NAT64LSN_TCP_EST_AGE (2 * 3600) /* TTL for established connection */
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#define NAT64LSN_TCP_FIN_AGE 180 /* State's TTL after FIN/RST received */
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#define NAT64LSN_UDP_AGE 120 /* TTL for UDP states */
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#define NAT64LSN_ICMP_AGE 60 /* TTL for ICMP states */
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#define NAT64LSN_HOST_AGE 3600 /* TTL for stale host entry */
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#define NAT64LSN_PG_AGE 900 /* TTL for stale ports groups */
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typedef struct _ipfw_nat64lsn_cfg {
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char name[64]; /* NAT name */
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uint32_t flags;
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uint32_t max_ports; /* Max ports per client */
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uint32_t agg_prefix_len; /* Prefix length to count */
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uint32_t agg_prefix_max; /* Max hosts per agg prefix */
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struct in_addr prefix4;
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uint16_t plen4; /* Prefix length */
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uint16_t plen6; /* Prefix length */
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struct in6_addr prefix6; /* NAT64 prefix */
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uint32_t jmaxlen; /* Max jobqueue length */
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uint16_t min_port; /* Min port group # to use */
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uint16_t max_port; /* Max port group # to use */
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uint16_t nh_delete_delay;/* Stale host delete delay */
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uint16_t pg_delete_delay;/* Stale portgroup delete delay */
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uint16_t st_syn_ttl; /* TCP syn expire */
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uint16_t st_close_ttl; /* TCP fin expire */
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uint16_t st_estab_ttl; /* TCP established expire */
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uint16_t st_udp_ttl; /* UDP expire */
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uint16_t st_icmp_ttl; /* ICMP expire */
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uint8_t set; /* Named instance set [0..31] */
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uint8_t spare;
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} ipfw_nat64lsn_cfg;
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typedef struct _ipfw_nat64lsn_state {
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struct in_addr daddr; /* Remote IPv4 address */
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uint16_t dport; /* Remote destination port */
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uint16_t aport; /* Local alias port */
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uint16_t sport; /* Source port */
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uint8_t flags; /* State flags */
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uint8_t spare[3];
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uint16_t idle; /* Last used time */
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} ipfw_nat64lsn_state;
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typedef struct _ipfw_nat64lsn_stg {
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uint64_t next_idx; /* next state index */
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struct in_addr alias4; /* IPv4 alias address */
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uint8_t proto; /* protocol */
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uint8_t flags;
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uint16_t spare;
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struct in6_addr host6; /* Bound IPv6 host */
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uint32_t count; /* Number of states */
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uint32_t spare2;
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} ipfw_nat64lsn_stg;
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#endif /* _NETINET6_IP_FW_NAT64_H_ */
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