%% sys/types.h
-define(U_CHAR, 8/little-unsigned-integer).
-define(U_SHORT, 16/little-unsigned-integer).
-define(U_LONG, 64/little-unsigned-integer).
-define(INT, 32/little-signed-integer).
-define(PID_T, ?INT).
-define(UINT8, 8/little-unsigned-integer).
-define(UINT16, 16/little-unsigned-integer).
-define(UINT32, 32/little-unsigned-integer).
-define(UINT64, 64/little-unsigned-integer).

%% sys/socket.h
-define(AF_UNSPEC, 0).
-define(AF_INET, 2).
-define(AF_LINK, 18).
-define(AF_INET6, 31).
-define(SOCK_RAW, 3).
-define(PF_ROUTE, 17).

%% net/route.h
-define(RTM_VERSION, 5).

-define(RTM_ADD, 16#1). % add route
-define(RTM_DELETE, 16#2). % delete route
-define(RTM_CHANGE, 16#3). % change metrics or flags
-define(RTM_GET, 16#4). % 1 report metrics
-define(RTM_LOSING, 16#5). % 1 kernel suspects partitionning
-define(RTM_REDIRECT, 16#6). % 1 told to use different route
-define(RTM_MISS, 16#7). % 1 lookup failed on this address
-define(RTM_LOCK, 16#8). % 1 fix specified metrics
-define(RTM_RESOLVE, 16#b). % 1 req to resolve dst to LL addr
-define(RTM_NEWADDR, 16#c). % 2 address being added to iface
-define(RTM_DELADDR, 16#d). % 2 address being removed from iface
-define(RTM_IFINFO, 16#e). % 3 iface going up/down
-define(RTM_NEWMADDR, 16#f). % 4 mcast group membership being added
-define(RTM_DELMADDR, 16#10). % 4mcast group membership being deleted
-define(RTM_IFANNOUNCE, 16#11). % 5 iface arrival/departure
-define(RTM_IEEE80211, 16#12). % 5 IEEE80211 wireless event
-define(RTM, #{?RTM_ADD => add, ?RTM_DELETE => delete, ?RTM_CHANGE => change, ?RTM_GET => get,
              ?RTM_LOSING => losing, ?RTM_REDIRECT => redirect, ?RTM_MISS => miss, ?RTM_LOCK => lock,
              ?RTM_RESOLVE => resolve, ?RTM_NEWADDR => newaddr, ?RTM_DELADDR => deladdr, ?RTM_IFINFO => ifinfo,
              ?RTM_NEWMADDR => newmaddr, ?RTM_DELMADDR => delmaddr, ?RTM_IFANNOUNCE => ifannounce, ?RTM_IEEE80211 => ieee80211}).

-define(RT_MSGHDRS, [?RTM_ADD, ?RTM_DELETE, ?RTM_CHANGE, ?RTM_GET, ?RTM_LOSING, ?RTM_REDIRECT, ?RTM_MISS, ?RTM_LOCK, ?RTM_RESOLVE]).
-define(IFA_MSGHDRS, [?RTM_NEWADDR, ?RTM_DELADDR]).
-define(IF_MSGHDRS, [?RTM_IFINFO]).
-define(IFMA_MSGHDRS, [?RTM_NEWMADDR, ?RTM_DELMADDR]).
-define(IF_ANNOUNCEMSGHDRS, [?RTM_IFANNOUNCE, ?RTM_IEEE80211]).

% Bitmask values for flags
-define(RTF_UP, 16#1). % route usable
-define(RTF_GATEWAY, 16#2). % destination is a gateway
-define(RTF_HOST, 16#4). % host entry
-define(RTF_REJECT, 16#8). % host or net unreachable
-define(RTF_DYNAMIC, 16#10). % created dynamically (by redirect)
-define(RTF_MODIFIED, 16#20). % modified dynamically (by redirect)
-define(RTF_DONE, 16#40). % message confirmed
-define(RTF_DELCLONE, 16#80). % unused, was RTF_DELCLONE
-define(RTF_CLONING, 16#100). % unused, was RTF_CLONING
-define(RTF_XRESOLVE, 16#200). % external daemon resolves name
-define(RTF_LLINFO, 16#400). % deprecated
-define(RTF_LLDATA, 16#400). % used by apps to add/del L2 entries
-define(RTF_STATIC, 16#800). % manually added
-define(RTF_BLACKHOLE, 16#1000). % just discard pkts
-define(RTF_PROTO2, 16#4000). % protocole specific routing flag
-define(RTF_PROTO1, 16#8000). % protocol specific routing flag
-define(RTF_PRCLONING, 16#10000). % deprecated
-define(RTF_WASCLONED, 16#20000). % deprecated
-define(RTF_PROTO3, 16#40000). % protocol specific routing flag
-define(RTF_FIXEDMTU, 16#80000). % mtu was explicitly specified
-define(RTF_PINNED, 16#100000). % route is immutable
-define(RTF_LOCAL, 16#200000). % route represents a local address
-define(RTF_BROADCAST, 16#400000). % route represents a bcast address
-define(RTF_MULTICAST, 16#800000). % route represents a mcast address
-define(RTF_STICKY, 16#10000000). % always route dst->src
-define(RTF_GWFLAG_COMPAT, 16#80000000). % compatibility bit for interacting with existing routing apps (?)
-define(RTF, [{?RTF_UP, up}, {?RTF_GATEWAY, gateway}, {?RTF_HOST, host}, {?RTF_REJECT, reject}, {?RTF_DYNAMIC, dynamic},
              {?RTF_MODIFIED, modified}, {?RTF_DONE, done}, {?RTF_DELCLONE, delclone}, {?RTF_CLONING, cloning},
             {?RTF_XRESOLVE, xresolve}, {?RTF_LLINFO, llinfo}, {?RTF_LLDATA, lldata}, {?RTF_STATIC, static},
             {?RTF_BLACKHOLE, blackhole}, {?RTF_PROTO2, proto2}, {?RTF_PROTO1, proto1}, {?RTF_PRCLONING, prcloning},
             {?RTF_WASCLONED, wascloned}, {?RTF_PROTO3, proto3}, {?RTF_FIXEDMTU, fixed_mtu}, {?RTF_PINNED, pinned},
             {?RTF_LOCAL, local}, {?RTF_BROADCAST, broadcast}, {?RTF_MULTICAST, multicast}, {?RTF_STICKY, sticky},
             {?RTF_GWFLAG_COMPAT, gw_flag_compat}]).
-define(RTF_CAN_CHANGE, [proto1, proto2, proto3, blackhole, reject, static, sticky]).

% fib_ nexthob info flags
-define(NHF_MULTIPATH, 16#0008). % Nexhop is a nexthop group
-define(NFH_REJECT, 16#0010). % RTF_REJECT
-define(NFH_BLACKHOLE, 16#0020). % RTF_BLACKHOLE
-define(NFH_REDIRECT, 16#0040). % RTF_DYNAMIC|RTF_MODIFIED
-define(NHF_DEFAULT, 16#0080). % Default route
-define(NHF_BROADCAST, 16#0100). % RTF_BROADCAST
-define(NHF_GATEWAY, 16#0200). % RTF_GATEWAY
-define(NHF_HOST, 16#0400). % RTF_HOST
-define(NHF, [{?NHF_MULTIPATH, multipath}, {?NHF_REJECT, reject}, {?NHF_BLACKHOLE, blackhole}, {?NHF_REDIRECT, redirect},
             {?NHF_DEFAULT, default}, {?NHF_BROADCAST, broadcast}, {?NHF_GATEWAY, gateway}, {?NHF_HOST, host}]).

% nexthop request flags
-define(NHR_NONE, 16#00). % empty flags field
-define(NHR_REF, 16#01). % reference nexhop
-define(NHR_NODEFAULT, 16#02). % uRPF: do not consider default route
% control plane route request flags
-define(NHR_COPY, 16#100). % copy rte data
-define(NHR_UNLOCKED, 16#200). % do not lock table
-define(NHR, [{?NHR_NONE, none}, {?NHR_REF, reference}, {?NHR_NODEFAULT, no_default}, {?NHR_COPY, copy}, {?NHR_UNLOCKED, unlocked}]).

% Bitmask values for rtm_inits and rmx_locks.
-define(RTV_MTU, 16#1).
-define(RTV_HOPCOUNT, 16#2).
-define(RTV_EXPIRE, 16#4).
-define(RTV_RPIPE, 16#8).
-define(RTV_SPIPE, 16#10).
-define(RTV_SSTHRESH, 16#20).
-define(RTV_RTT, 16#40).
-define(RTV_RTTVAR, 16#80).
-define(RTV_WEIGHT, 16#100).
-define(RTV, [{?RTV_MTU, mtu}, {?RTV_HOPCOUNT, hopcount}, {?RTV_EXPIRE, expire}, {?RTV_RPIPE, rpipe}, {?RTV_SPIPE, spipe},
             {?RTV_SSTHRESH, ssthresh}, {?RTV_RTT, rtt}, {?RTV_RTTVAR, rttvar}, {?RTV_WEIGHT, weight}]).

% Bitmask values for rtm_addrs.
-define(RTA_DST, 16#1).
-define(RTA_GATEWAY, 16#2).
-define(RTA_NETMASK, 16#4).
-define(RTA_GENMASK, 16#8).
-define(RTA_IFP, 16#10).
-define(RTA_IFA, 16#20).
-define(RTA_AUTHOR, 16#40).
-define(RTA_BRD, 16#80).
-define(RTA, [{?RTA_DST, destination}, {?RTA_GATEWAY, gateway}, {?RTA_NETMASK, netmask}, {?RTA_GENMASK, genmask},
             {?RTA_IFP, ifp}, {?RTA_IFA, ifa}, {?RTA_AUTHOR, author}, {?RTA_BRD, brd}]).

% rt_msghdr
-record(freebsd_rt, {type,
                    flags,
                    addrs,
                    pid,
                    seq,
                    errno,
                    fmask,
                    metrics_init,

                    %% metrics
                    metrics_lock,
                    mtu,
                    hopcount,
                    expire,
                    recvpipe,
                    sendpipe,
                    ssthresh,
                    rtt,
                    rttvar,
                    pksent,
                    weight,
                    nhidx,
                    filler,

                    %% addrs
                    destination,
                    netmask,
                    gateway,
                    genmask,
                    ifp,
                    ifp_index,
                    ifa,
                    author,
                    brd}).

% sockaddr_dl
-record(freebsd_link, {index, type, name, address, selector}).

% net/if.h

%% if flags
-define(IFF_UP, 16#1).
-define(IFF_BROADCAST, 16#2).
-define(IFF_DEBUG, 16#4).
-define(IFF_LOOPBACK, 16#8).
-define(IFF_POINTOPOINT, 16#10).
-define(IFF_KNOWSEPOCH, 16#20).
-define(IFF_DRV_RUNNING, 16#40).
-define(IFF_NOARP, 16#80).
-define(IFF_PROMISC, 16#100).
-define(IFF_ALLMULTI, 16#200).
-define(IFF_DRV_OACTIVE, 16#400).
-define(IFF_SIMPLEX, 16#800).
-define(IFF_LINK0, 16#1000).
-define(IFF_LINK1, 16#2000).
-define(IFF_LINK2, 16#4000).
%-define(IFF_ALTPHYS, IFF_LINK2).
-define(IFF_MULTICAST, 16#8000).
-define(IFF_CANTCONFIG, 16#10000).
-define(IFF_PPROMISC, 16#20000).
-define(IFF_MONITOR, 16#40000).
-define(IFF_STATICARP, 16#80000).
-define(IFF_DYING, 16#200000).
-define(IFF_RENAMING, 16#400000).
-define(IFF, [{?IFF_UP, up}, {?IFF_BROADCAST, broadcast}, {?IFF_DEBUG, debug}, {?IFF_LOOPBACK, loopback}, {?IFF_POINTOPOINT, pointopoint},
              {?IFF_KNOWSEPOCH, knowsepoch}, {?IFF_DRV_RUNNING, drv_running}, {?IFF_NOARP, noarp}, {?IFF_PROMISC, promisc},
              {?IFF_ALLMULTI, allmulti}, {?IFF_DRV_OACTIVE, drv_oactive}, {?IFF_SIMPLEX, simplex}, {?IFF_LINK0, link0}, {?IFF_LINK1, link1},
              {?IFF_LINK2, link2}, {?IFF_MULTICAST, multicast}, {?IFF_CANTCONFIG, cantconfig}, {?IFF_PPROMISC, ppromisc}, {?IFF_MONITOR, monitor},
              {?IFF_STATICARP, staticarp}, {?IFF_DYING, dying}, {?IFF_RENAMING, renaming}]).

-define(LINK_STATE_UNKNOWN, 0).
-define(LINK_STATE_DOWN, 1).
-define(LINK_STATE_UP, 2).
-define(LINK_STATE, #{?LINK_STATE_UNKNOWN => unknown, ?LINK_STATE_DOWN => down, ?LINK_STATE_UP => up}).

% if_msghdr + ifm_data
-record(freebsd_if, {index, addrs, flags,
                     % if_data: generic interface information
                     type, physical, addrlen, hdrlen, linkstate, vhid, datalen, mtu, metric, baudrate,
                     % if_data: volatile statistics
                     ipackets, ierrors, opackets, oerrors, collisions, ibytes, obytes, imcasts, omcasts, iqdrops, oqdrops, noproto, hwassist
}).

% ifa_msghdr
-record(freebsd_ifa, {addrs, flags, index, metric}).

% ifma_msghdr
-record(freebsd_ifma, {addrs, flags, index}).

% ifannounce_msghdr
-record(freebsd_ifannounce, {index, name, announcement}). %% 0 Arrival 1 departure