--- /dev/null
+--- /dev/null 2024-03-22 15:39:07.538356000 +0100
++++ sysdep/bsd-netlink/netlink-route.h 2024-03-22 15:39:02.226088000 +0100
+@@ -0,0 +1,367 @@
++/*-
++ * SPDX-License-Identifier: BSD-2-Clause
++ *
++ * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
++ *
++ * 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 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 AUTHOR 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.
++ */
++
++/*
++ * Route-related (RTM_<NEW|DEL|GET>ROUTE) message header and attributes.
++ */
++
++#ifndef _NETLINK_ROUTE_ROUTE_H_
++#define _NETLINK_ROUTE_ROUTE_H_
++
++/* Base header for all of the relevant messages */
++struct rtmsg {
++ unsigned char rtm_family; /* address family */
++ unsigned char rtm_dst_len; /* Prefix length */
++ unsigned char rtm_src_len; /* Source prefix length (not used) */
++ unsigned char rtm_tos; /* Type of service (not used) */
++ unsigned char rtm_table; /* rtable id */
++ unsigned char rtm_protocol; /* Routing protocol id (RTPROT_) */
++ unsigned char rtm_scope; /* Route distance (RT_SCOPE_) */
++ unsigned char rtm_type; /* Route type (RTN_) */
++ unsigned rtm_flags; /* Route flags (RTM_F_) */
++};
++
++/*
++ * RFC 3549, 3.1.1, route type (rtm_type field).
++ */
++enum {
++ RTN_UNSPEC,
++ RTN_UNICAST, /* Unicast route */
++ RTN_LOCAL, /* Accept locally (not supported) */
++ RTN_BROADCAST, /* Accept locally as broadcast, send as broadcast */
++ RTN_ANYCAST, /* Accept locally as broadcast, but send as unicast */
++ RTN_MULTICAST, /* Multicast route */
++ RTN_BLACKHOLE, /* Drop traffic towards destination */
++ RTN_UNREACHABLE, /* Destination is unreachable */
++ RTN_PROHIBIT, /* Administratively prohibited */
++ RTN_THROW, /* Not in this table (not supported) */
++ RTN_NAT, /* Translate this address (not supported) */
++ RTN_XRESOLVE, /* Use external resolver (not supported) */
++ __RTN_MAX,
++};
++#define RTN_MAX (__RTN_MAX - 1)
++
++/*
++ * RFC 3549, 3.1.1, protocol (Identifies what/who added the route).
++ * Values larger than RTPROT_STATIC(4) are not interpreted by the
++ * kernel, they are just for user information.
++ */
++#define RTPROT_UNSPEC 0
++#define RTPROT_REDIRECT 1 /* Route installed by ICMP redirect */
++#define RTPROT_KERNEL 2 /* Route installed by kernel */
++#define RTPROT_BOOT 3 /* Route installed during boot */
++#define RTPROT_STATIC 4 /* Route installed by administrator */
++
++#define RTPROT_GATED 8
++#define RTPROT_RA 9
++#define RTPROT_MRT 1
++#define RTPROT_ZEBRA 11
++#define RTPROT_BIRD 12
++#define RTPROT_DNROUTED 13
++#define RTPROT_XORP 14
++#define RTPROT_NTK 15
++#define RTPROT_DHCP 16
++#define RTPROT_MROUTED 17
++#define RTPROT_KEEPALIVED 18
++#define RTPROT_BABEL 42
++#define RTPROT_OPENR 99
++#define RTPROT_BGP 186
++#define RTPROT_ISIS 187
++#define RTPROT_OSPF 188
++#define RTPROT_RIP 189
++#define RTPROT_EIGRP 192
++
++/*
++ * RFC 3549 3.1.1 Route scope (valid distance to destination).
++ *
++ * The values between RT_SCOPE_UNIVERSE(0) and RT_SCOPE_SITE(200)
++ * are available to the user.
++ */
++enum rt_scope_t {
++ RT_SCOPE_UNIVERSE = 0,
++ /* User defined values */
++ RT_SCOPE_SITE = 200,
++ RT_SCOPE_LINK = 253,
++ RT_SCOPE_HOST = 254,
++ RT_SCOPE_NOWHERE = 255
++};
++
++/*
++ * RFC 3549 3.1.1 Route flags (rtm_flags).
++ * Is a composition of RTNH_F flags (0x1..0x40 range), RTM_F flags (below)
++ * and per-protocol (IPv4/IPv6) flags.
++ */
++#define RTM_F_NOTIFY 0x00000100 /* not supported */
++#define RTM_F_CLONED 0x00000200 /* not supported */
++#define RTM_F_EQUALIZE 0x00000400 /* not supported */
++#define RTM_F_PREFIX 0x00000800 /* not supported */
++#define RTM_F_LOOKUP_TABLE 0x00001000 /* not supported */
++#define RTM_F_FIB_MATCH 0x00002000 /* not supported */
++#define RTM_F_OFFLOAD 0x00004000 /* not supported */
++#define RTM_F_TRAP 0x00008000 /* not supported */
++#define RTM_F_OFFLOAD_FAILED 0x20000000 /* not supported */
++
++/* Compatibility handling helpers */
++#ifndef _KERNEL
++#define NL_RTM_HDRLEN ((int)sizeof(struct rtmsg))
++#define RTM_RTA(_rtm) ((struct rtattr *)((char *)(_rtm) + NL_RTM_HDRLEN))
++#define RTM_PAYLOAD(_hdr) NLMSG_PAYLOAD((_hdr), NL_RTM_HDRLEN)
++#endif
++
++/*
++ * Routing table identifiers.
++ * FreeBSD route table numbering starts from 0, where 0 is a valid default routing table.
++ * Indicating "all tables" via netlink can be done by not including RTA_TABLE attribute
++ * and keeping rtm_table=0 (compatibility) or setting RTA_TABLE value to RT_TABLE_UNSPEC.
++ */
++#define RT_TABLE_MAIN 0 /* RT_DEFAULT_FIB */
++#define RT_TABLE_UNSPEC 0xFFFFFFFF /* RT_ALL_FIBS */
++
++enum rtattr_type_t {
++ NL_RTA_UNSPEC,
++ NL_RTA_DST = 1, /* binary, IPv4/IPv6 destination */
++ NL_RTA_SRC = 2, /* binary, preferred source address */
++ NL_RTA_IIF = 3, /* not supported */
++ NL_RTA_OIF = 4, /* u32, transmit ifindex */
++ NL_RTA_GATEWAY = 5, /* binary: IPv4/IPv6 gateway */
++ NL_RTA_PRIORITY = 6, /* not supported */
++ NL_RTA_PREFSRC = 7, /* not supported */
++ NL_RTA_METRICS = 8, /* nested, list of NL_RTAX* attrs */
++ NL_RTA_MULTIPATH = 9, /* binary, array of struct rtnexthop */
++ NL_RTA_PROTOINFO = 10, /* not supported / deprecated */
++ NL_RTA_KNH_ID = 10, /* u32, FreeBSD specific, kernel nexthop index */
++ NL_RTA_FLOW = 11, /* not supported */
++ NL_RTA_CACHEINFO = 12, /* not supported */
++ NL_RTA_SESSION = 13, /* not supported / deprecated */
++ NL_RTA_WEIGHT = 13, /* u32, FreeBSD specific, path weight */
++ NL_RTA_MP_ALGO = 14, /* not supported / deprecated */
++ NL_RTA_RTFLAGS = 14, /* u32, FreeBSD specific, path flags (RTF_)*/
++ NL_RTA_TABLE = 15, /* u32, fibnum */
++ NL_RTA_MARK = 16, /* not supported */
++ NL_RTA_MFC_STATS = 17, /* not supported */
++ NL_RTA_VIA = 18, /* binary, struct rtvia */
++ NL_RTA_NEWDST = 19, /* not supported */
++ NL_RTA_PREF = 20, /* not supported */
++ NL_RTA_ENCAP_TYPE = 21, /* not supported */
++ NL_RTA_ENCAP = 22, /* not supported */
++ NL_RTA_EXPIRES = 23, /* u32, seconds till expiration */
++ NL_RTA_PAD = 24, /* not supported */
++ NL_RTA_UID = 25, /* not supported */
++ NL_RTA_TTL_PROPAGATE = 26, /* not supported */
++ NL_RTA_IP_PROTO = 27, /* not supported */
++ NL_RTA_SPORT = 28, /* not supported */
++ NL_RTA_DPORT = 29, /* not supported */
++ NL_RTA_NH_ID = 30, /* u32, nexthop/nexthop group index */
++ __RTA_MAX
++};
++#define NL_RTA_MAX (__RTA_MAX - 1)
++
++/*
++ * Attributes that can be used as filters:
++ *
++ */
++
++#ifndef _KERNEL
++/*
++ * RTA_* space has clashes with rtsock namespace.
++ * Use NL_RTA_ prefix in the kernel and map to
++ * RTA_ for userland.
++ */
++#define RTA_UNSPEC NL_RTA_UNSPEC
++#define RTA_DST NL_RTA_DST
++#define RTA_SRC NL_RTA_SRC
++#define RTA_IIF NL_RTA_IIF
++#define RTA_OIF NL_RTA_OIF
++#define RTA_GATEWAY NL_RTA_GATEWAY
++#define RTA_PRIORITY NL_RTA_PRIORITY
++#define RTA_PREFSRC NL_RTA_PREFSRC
++#define RTA_METRICS NL_RTA_METRICS
++#define RTA_MULTIPATH NL_RTA_MULTIPATH
++#define RTA_PROTOINFO NL_RTA_PROTOINFO
++#define RTA_KNH_ID NL_RTA_KNH_ID
++#define RTA_FLOW NL_RTA_FLOW
++#define RTA_CACHEINFO NL_RTA_CACHEINFO
++#define RTA_SESSION NL_RTA_SESSION
++#define RTA_MP_ALGO NL_RTA_MP_ALGO
++#define RTA_TABLE NL_RTA_TABLE
++#define RTA_MARK NL_RTA_MARK
++#define RTA_MFC_STATS NL_RTA_MFC_STATS
++#define RTA_VIA NL_RTA_VIA
++#define RTA_NEWDST NL_RTA_NEWDST
++#define RTA_PREF NL_RTA_PREF
++#define RTA_ENCAP_TYPE NL_RTA_ENCAP_TYPE
++#define RTA_ENCAP NL_RTA_ENCAP
++#define RTA_EXPIRES NL_RTA_EXPIRES
++#define RTA_PAD NL_RTA_PAD
++#define RTA_UID NL_RTA_UID
++#define RTA_TTL_PROPAGATE NL_RTA_TTL_PROPAGATE
++#define RTA_IP_PROTO NL_RTA_IP_PROTO
++#define RTA_SPORT NL_RTA_SPORT
++#define RTA_DPORT NL_RTA_DPORT
++#define RTA_NH_ID NL_RTA_NH_ID
++#define RTA_MAX NL_RTA_MAX
++#endif
++
++/* route attribute header */
++struct rtattr {
++ unsigned short rta_len;
++ unsigned short rta_type;
++};
++
++#define NL_RTA_ALIGN_SIZE NL_ITEM_ALIGN_SIZE
++#define NL_RTA_ALIGN NL_ITEM_ALIGN
++#define NL_RTA_HDRLEN ((int)sizeof(struct rtattr))
++#define NL_RTA_DATA_LEN(_rta) ((int)((_rta)->rta_len - NL_RTA_HDRLEN))
++#define NL_RTA_DATA(_rta) NL_ITEM_DATA(_rta, NL_RTA_HDRLEN)
++#define NL_RTA_DATA_CONST(_rta) NL_ITEM_DATA_CONST(_rta, NL_RTA_HDRLEN)
++
++/* Compatibility attribute handling helpers */
++#ifndef _KERNEL
++#define RTA_ALIGNTO NL_RTA_ALIGN_SIZE
++#define RTA_ALIGN(_len) NL_RTA_ALIGN(_len)
++#define _RTA_LEN(_rta) ((int)(_rta)->rta_len)
++#define _RTA_ALIGNED_LEN(_rta) RTA_ALIGN(_RTA_LEN(_rta))
++#define RTA_OK(_rta, _len) NL_ITEM_OK(_rta, _len, NL_RTA_HDRLEN, _RTA_LEN)
++#define RTA_NEXT(_rta, _len) NL_ITEM_ITER(_rta, _len, _RTA_ALIGNED_LEN)
++#define RTA_LENGTH(_len) (NL_RTA_HDRLEN + (_len))
++#define RTA_SPACE(_len) RTA_ALIGN(RTA_LENGTH(_len))
++#define RTA_DATA(_rta) NL_RTA_DATA(_rta)
++#define RTA_PAYLOAD(_rta) ((int)(_RTA_LEN(_rta) - NL_RTA_HDRLEN))
++#endif
++
++/* RTA attribute headers */
++
++/* RTA_VIA */
++struct rtvia {
++ sa_family_t rtvia_family;
++ uint8_t rtvia_addr[0];
++};
++
++/*
++ * RTA_METRICS is a nested attribute, consisting of a list of
++ * TLVs with types defined below.
++ */
++ enum {
++ NL_RTAX_UNSPEC,
++ NL_RTAX_LOCK = 1, /* not supported */
++ NL_RTAX_MTU = 2, /* desired path MTU */
++ NL_RTAX_WINDOW = 3, /* not supported */
++ NL_RTAX_RTT = 4, /* not supported */
++ NL_RTAX_RTTVAR = 5, /* not supported */
++ NL_RTAX_SSTHRESH = 6, /* not supported */
++ NL_RTAX_CWND = 7, /* not supported */
++ NL_RTAX_ADVMSS = 8, /* not supported */
++ NL_RTAX_REORDERING = 9, /* not supported */
++ NL_RTAX_HOPLIMIT = 10, /* not supported */
++ NL_RTAX_INITCWND = 11, /* not supporrted */
++ NL_RTAX_FEATURES = 12, /* not supported */
++ NL_RTAX_RTO_MIN = 13, /* not supported */
++ NL_RTAX_INITRWND = 14, /* not supported */
++ NL_RTAX_QUICKACK = 15, /* not supported */
++ NL_RTAX_CC_ALGO = 16, /* not supported */
++ NL_RTAX_FASTOPEN_NO_COOKIE = 17, /* not supported */
++ __NL_RTAX_MAX
++};
++#define NL_RTAX_MAX (__NL_RTAX_MAX - 1)
++
++#define RTAX_FEATURE_ECN (1 << 0)
++#define RTAX_FEATURE_SACK (1 << 1)
++#define RTAX_FEATURE_TIMESTAMP (1 << 2)
++#define RTAX_FEATURE_ALLFRAG (1 << 3)
++
++#define RTAX_FEATURE_MASK \
++ (RTAX_FEATURE_ECN | RTAX_FEATURE_SACK | RTAX_FEATURE_TIMESTAMP | \
++ RTAX_FEATURE_ALLFRAG)
++
++#ifndef _KERNEL
++
++/*
++ * RTAX_* space clashes with rtsock namespace.
++ * Use NL_RTAX_ prefix in the kernel and map to
++ * RTAX_ for userland.
++ */
++#define RTAX_UNSPEC NL_RTAX_UNSPEC
++#define RTAX_LOCK NL_RTAX_LOCK
++#define RTAX_MTU NL_RTAX_MTU
++#define RTAX_WINDOW NL_RTAX_WINDOW
++#define RTAX_RTT NL_RTAX_RTT
++#define RTAX_RTTVAR NL_RTAX_RTTVAR
++#define RTAX_SSTHRESH NL_RTAX_SSTHRESH
++#define RTAX_CWND NL_RTAX_CWND
++#define RTAX_ADVMSS NL_RTAX_ADVMSS
++#define RTAX_REORDERING NL_RTAX_REORDERING
++#define RTAX_HOPLIMIT NL_RTAX_HOPLIMIT
++#define RTAX_INITCWND NL_RTAX_INITCWND
++#define RTAX_FEATURES NL_RTAX_FEATURES
++#define RTAX_RTO_MIN NL_RTAX_RTO_MIN
++#define RTAX_INITRWND NL_RTAX_INITRWND
++#define RTAX_QUICKACK NL_RTAX_QUICKACK
++#define RTAX_CC_ALGO NL_RTAX_CC_ALGO
++#define RTAX_FASTOPEN_NO_COOKIE NL_RTAX_FASTOPEN_NO_COOKIE
++#endif
++
++/*
++ * RTA_MULTIPATH consists of an array of rtnexthop structures.
++ * Each rtnexthop structure contains RTA_GATEWAY or RTA_VIA
++ * attribute following the header.
++ */
++struct rtnexthop {
++ unsigned short rtnh_len;
++ unsigned char rtnh_flags;
++ unsigned char rtnh_hops; /* nexthop weight */
++ int rtnh_ifindex;
++};
++
++/* rtnh_flags */
++#define RTNH_F_DEAD 0x01 /* not supported */
++#define RTNH_F_PERVASIVE 0x02 /* not supported */
++#define RTNH_F_ONLINK 0x04 /* not supported */
++#define RTNH_F_OFFLOAD 0x08 /* not supported */
++#define RTNH_F_LINKDOWN 0x10 /* not supported */
++#define RTNH_F_UNRESOLVED 0x20 /* not supported */
++#define RTNH_F_TRAP 0x40 /* not supported */
++
++#define RTNH_COMPARE_MASK (RTNH_F_DEAD | RTNH_F_LINKDOWN | \
++ RTNH_F_OFFLOAD | RTNH_F_TRAP)
++
++/* Macros to handle hexthops */
++#define RTNH_ALIGNTO NL_ITEM_ALIGN_SIZE
++#define RTNH_ALIGN(_len) NL_ITEM_ALIGN(_len)
++#define RTNH_HDRLEN ((int)sizeof(struct rtnexthop))
++#define _RTNH_LEN(_nh) ((int)(_nh)->rtnh_len)
++#define _RTNH_ALIGNED_LEN(_nh) RTNH_ALIGN(_RTNH_LEN(_nh))
++#define RTNH_OK(_nh, _len) NL_ITEM_OK(_nh, _len, RTNH_HDRLEN, _RTNH_LEN)
++#define RTNH_NEXT(_nh) ((struct rtnexthop *)((char *)(_nh) + _RTNH_ALIGNED_LEN(_nh)))
++#define RTNH_LENGTH(_len) (RTNH_HDRLEN + (_len))
++#define RTNH_SPACE(_len) RTNH_ALIGN(RTNH_LENGTH(_len))
++#define RTNH_DATA(_nh) ((struct rtattr *)NL_ITEM_DATA(_nh, RTNH_HDRLEN))
++
++struct rtgenmsg {
++ unsigned char rtgen_family;
++};
++
++#endif