157 lines
5.4 KiB
C
157 lines
5.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2015-2019 Yandex LLC
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* Copyright (c) 2015-2019 Andrey V. Elsukov <ae@FreeBSD.org>
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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 _IP_FW_NAT64_TRANSLATE_H_
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#define _IP_FW_NAT64_TRANSLATE_H_
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struct nat64_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 nomatch4; /* No addr/port match */
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uint64_t noproto; /* Protocol not supported */
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uint64_t nomem; /* mbufs allocation failed */
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uint64_t dropped; /* number of packets silently
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* dropped due to some errors/
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* unsupported/etc.
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*/
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uint64_t jrequests; /* jobs requests queued */
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uint64_t jcalls; /* jobs handler calls */
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uint64_t jhostsreq; /* hosts requests */
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uint64_t jportreq; /* PG allocation requests */
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uint64_t jhostfails; /* hosts requests failed */
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uint64_t jportfails; /* PG allocation failed */
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uint64_t jmaxlen;
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uint64_t jnomem;
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uint64_t jreinjected;
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uint64_t screated;
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uint64_t sdeleted;
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uint64_t spgcreated;
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uint64_t spgdeleted;
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};
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#define IPFW_NAT64_VERSION 1
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#define NAT64STATS (sizeof(struct nat64_stats) / sizeof(uint64_t))
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struct nat64_counters {
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counter_u64_t cnt[NAT64STATS];
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};
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#define NAT64STAT_ADD(s, f, v) \
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counter_u64_add((s)->cnt[ \
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offsetof(struct nat64_stats, f) / sizeof(uint64_t)], (v))
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#define NAT64STAT_INC(s, f) NAT64STAT_ADD(s, f, 1)
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#define NAT64STAT_FETCH(s, f) \
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counter_u64_fetch((s)->cnt[ \
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offsetof(struct nat64_stats, f) / sizeof(uint64_t)])
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#define L3HDR(_ip, _t) ((_t)((uint32_t *)(_ip) + (_ip)->ip_hl))
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#define TCP(p) ((struct tcphdr *)(p))
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#define UDP(p) ((struct udphdr *)(p))
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#define ICMP(p) ((struct icmphdr *)(p))
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#define ICMP6(p) ((struct icmp6_hdr *)(p))
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#define NAT64SKIP 0
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#define NAT64RETURN 1
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#define NAT64MFREE -1
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/*
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* According to RFC6877:
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* PLAT is provider-side translator (XLAT) that translates N:1 global
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* IPv6 addresses to global IPv4 addresses, and vice versa.
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*
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* CLAT is customer-side translator (XLAT) that algorithmically
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* translates 1:1 private IPv4 addresses to global IPv6 addresses,
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* and vice versa.
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*/
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struct nat64_config {
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struct in6_addr clat_prefix;
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struct in6_addr plat_prefix;
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uint32_t flags;
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#define NAT64_WKPFX 0x00010000 /* prefix is well-known */
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#define NAT64_CLATPFX 0x00020000 /* dst prefix is configured */
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#define NAT64_PLATPFX 0x00040000 /* src prefix is configured */
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uint8_t clat_plen;
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uint8_t plat_plen;
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struct nat64_counters stats;
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};
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static inline int
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nat64_check_ip6(struct in6_addr *addr)
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{
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/* XXX: We should really check /8 */
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if (addr->s6_addr16[0] == 0 || /* 0000::/8 Reserved by IETF */
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IN6_IS_ADDR_MULTICAST(addr) || IN6_IS_ADDR_LINKLOCAL(addr))
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return (1);
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return (0);
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}
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static inline int
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nat64_check_ip4(in_addr_t ia)
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{
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/* These checks are ordered from most likely to least */
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if (IN_MULTICAST(ntohl(ia)) || IN_LOOPBACK(ntohl(ia)) ||
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IN_LINKLOCAL(ntohl(ia)) || IN_EXPERIMENTAL(ntohl(ia)))
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return (1);
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return (0);
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}
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/* Well-known prefix 64:ff9b::/96 */
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#define IPV6_ADDR_INT32_WKPFX htonl(0x64ff9b)
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#define IN6_IS_ADDR_WKPFX(a) \
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((a)->s6_addr32[0] == IPV6_ADDR_INT32_WKPFX && \
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(a)->s6_addr32[1] == 0 && (a)->s6_addr32[2] == 0)
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int nat64_check_private_ip4(const struct nat64_config *cfg, in_addr_t ia);
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int nat64_check_prefixlen(int length);
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int nat64_check_prefix6(const struct in6_addr *prefix, int length);
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int nat64_getlasthdr(struct mbuf *m, int *offset);
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int nat64_do_handle_ip4(struct mbuf *m, struct in6_addr *saddr,
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struct in6_addr *daddr, uint16_t lport, struct nat64_config *cfg,
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void *logdata);
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int nat64_do_handle_ip6(struct mbuf *m, uint32_t aaddr, uint16_t aport,
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struct nat64_config *cfg, void *logdata);
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int nat64_handle_icmp6(struct mbuf *m, int hlen, uint32_t aaddr,
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uint16_t aport, struct nat64_config *cfg, void *logdata);
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void nat64_embed_ip4(struct in6_addr *ip6, int plen, in_addr_t ia);
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in_addr_t nat64_extract_ip4(const struct in6_addr *ip6, int plen);
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void nat64_set_output_method(int);
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int nat64_get_output_method(void);
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#endif
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