tailscale/net/interfaces/route.h

/*
 * Copyright (c) 2000-2017 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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 * Please see the License for the specific language governing rights and
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 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1980, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.h	8.3 (Berkeley) 4/19/94
 * $FreeBSD: src/sys/net/route.h,v 1.36.2.1 2000/08/16 06:14:23 jayanth Exp $
 */

#ifndef _NET_ROUTE_H_
#define _NET_ROUTE_H_
#include <sys/appleapiopts.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/socket.h>

/*
 * These numbers are used by reliable protocols for determining
 * retransmission behavior and are included in the routing structure.
 */
struct rt_metrics {
	u_int32_t       rmx_locks;      /* Kernel leaves these values alone */
	u_int32_t       rmx_mtu;        /* MTU for this path */
	u_int32_t       rmx_hopcount;   /* max hops expected */
	int32_t         rmx_expire;     /* lifetime for route, e.g. redirect */
	u_int32_t       rmx_recvpipe;   /* inbound delay-bandwidth product */
	u_int32_t       rmx_sendpipe;   /* outbound delay-bandwidth product */
	u_int32_t       rmx_ssthresh;   /* outbound gateway buffer limit */
	u_int32_t       rmx_rtt;        /* estimated round trip time */
	u_int32_t       rmx_rttvar;     /* estimated rtt variance */
	u_int32_t       rmx_pksent;     /* packets sent using this route */
	u_int32_t       rmx_state;      /* route state */
	u_int32_t       rmx_filler[3];  /* will be used for T/TCP later */
};

/*
 * rmx_rtt and rmx_rttvar are stored as microseconds;
 */
#define RTM_RTTUNIT     1000000 /* units for rtt, rttvar, as units per sec */



#define RTF_UP          0x1             /* route usable */
#define RTF_GATEWAY     0x2             /* destination is a gateway */
#define RTF_HOST        0x4             /* host entry (net otherwise) */
#define RTF_REJECT      0x8             /* host or net unreachable */
#define RTF_DYNAMIC     0x10            /* created dynamically (by redirect) */
#define RTF_MODIFIED    0x20            /* modified dynamically (by redirect) */
#define RTF_DONE        0x40            /* message confirmed */
#define RTF_DELCLONE    0x80            /* delete cloned route */
#define RTF_CLONING     0x100           /* generate new routes on use */
#define RTF_XRESOLVE    0x200           /* external daemon resolves name */
#define RTF_LLINFO      0x400           /* DEPRECATED - exists ONLY for backward
	                                 *  compatibility */
#define RTF_LLDATA      0x400           /* used by apps to add/del L2 entries */
#define RTF_STATIC      0x800           /* manually added */
#define RTF_BLACKHOLE   0x1000          /* just discard pkts (during updates) */
#define RTF_NOIFREF     0x2000          /* not eligible for RTF_IFREF */
#define RTF_PROTO2      0x4000          /* protocol specific routing flag */
#define RTF_PROTO1      0x8000          /* protocol specific routing flag */

#define RTF_PRCLONING   0x10000         /* protocol requires cloning */
#define RTF_WASCLONED   0x20000         /* route generated through cloning */
#define RTF_PROTO3      0x40000         /* protocol specific routing flag */
                                        /* 0x80000 unused */
#define RTF_PINNED      0x100000        /* future use */
#define RTF_LOCAL       0x200000        /* route represents a local address */
#define RTF_BROADCAST   0x400000        /* route represents a bcast address */
#define RTF_MULTICAST   0x800000        /* route represents a mcast address */
#define RTF_IFSCOPE     0x1000000       /* has valid interface scope */
#define RTF_CONDEMNED   0x2000000       /* defunct; no longer modifiable */
#define RTF_IFREF       0x4000000       /* route holds a ref to interface */
#define RTF_PROXY       0x8000000       /* proxying, no interface scope */
#define RTF_ROUTER      0x10000000      /* host is a router */
#define RTF_DEAD        0x20000000      /* Route entry is being freed */
                                        /* 0x40000000 and up unassigned */

#define RTPRF_OURS      RTF_PROTO3      /* set on routes we manage */
#define RTF_BITS \
	"\020\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE" \
	"\10DELCLONE\11CLONING\12XRESOLVE\13LLINFO\14STATIC\15BLACKHOLE" \
	"\16NOIFREF\17PROTO2\20PROTO1\21PRCLONING\22WASCLONED\23PROTO3" \
	"\25PINNED\26LOCAL\27BROADCAST\30MULTICAST\31IFSCOPE\32CONDEMNED" \
	"\33IFREF\34PROXY\35ROUTER"

#define IS_DIRECT_HOSTROUTE(rt) \
	(((rt)->rt_flags & (RTF_HOST | RTF_GATEWAY)) == RTF_HOST)
/*
 * Routing statistics.
 */
struct  rtstat {
	short   rts_badredirect;        /* bogus redirect calls */
	short   rts_dynamic;            /* routes created by redirects */
	short   rts_newgateway;         /* routes modified by redirects */
	short   rts_unreach;            /* lookups which failed */
	short   rts_wildcard;           /* lookups satisfied by a wildcard */
	short   rts_badrtgwroute;       /* route to gateway is not direct */
};

/*
 * Structures for routing messages.
 */
struct rt_msghdr {
	u_short rtm_msglen;     /* to skip over non-understood messages */
	u_char  rtm_version;    /* future binary compatibility */
	u_char  rtm_type;       /* message type */
	u_short rtm_index;      /* index for associated ifp */
	int     rtm_flags;      /* flags, incl. kern & message, e.g. DONE */
	int     rtm_addrs;      /* bitmask identifying sockaddrs in msg */
	pid_t   rtm_pid;        /* identify sender */
	int     rtm_seq;        /* for sender to identify action */
	int     rtm_errno;      /* why failed */
	int     rtm_use;        /* from rtentry */
	u_int32_t rtm_inits;    /* which metrics we are initializing */
	struct rt_metrics rtm_rmx; /* metrics themselves */
};

struct rt_msghdr2 {
	u_short rtm_msglen;     /* to skip over non-understood messages */
	u_char  rtm_version;    /* future binary compatibility */
	u_char  rtm_type;       /* message type */
	u_short rtm_index;      /* index for associated ifp */
	int     rtm_flags;      /* flags, incl. kern & message, e.g. DONE */
	int     rtm_addrs;      /* bitmask identifying sockaddrs in msg */
	int32_t rtm_refcnt;     /* reference count */
	int     rtm_parentflags; /* flags of the parent route */
	int     rtm_reserved;   /* reserved field set to 0 */
	int     rtm_use;        /* from rtentry */
	u_int32_t rtm_inits;    /* which metrics we are initializing */
	struct rt_metrics rtm_rmx; /* metrics themselves */
};


#define RTM_VERSION     5       /* Up the ante and ignore older versions */

/*
 * Message types.
 */
#define RTM_ADD         0x1     /* Add Route */
#define RTM_DELETE      0x2     /* Delete Route */
#define RTM_CHANGE      0x3     /* Change Metrics or flags */
#define RTM_GET         0x4     /* Report Metrics */
#define RTM_LOSING      0x5     /* RTM_LOSING is no longer generated by xnu
	                         *  and is deprecated */
#define RTM_REDIRECT    0x6     /* Told to use different route */
#define RTM_MISS        0x7     /* Lookup failed on this address */
#define RTM_LOCK        0x8     /* fix specified metrics */
#define RTM_OLDADD      0x9     /* caused by SIOCADDRT */
#define RTM_OLDDEL      0xa     /* caused by SIOCDELRT */
#define RTM_RESOLVE     0xb     /* req to resolve dst to LL addr */
#define RTM_NEWADDR     0xc     /* address being added to iface */
#define RTM_DELADDR     0xd     /* address being removed from iface */
#define RTM_IFINFO      0xe     /* iface going up/down etc. */
#define RTM_NEWMADDR    0xf     /* mcast group membership being added to if */
#define RTM_DELMADDR    0x10    /* mcast group membership being deleted */
#define RTM_IFINFO2     0x12    /* */
#define RTM_NEWMADDR2   0x13    /* */
#define RTM_GET2        0x14    /* */

/*
 * Bitmask values for rtm_inits and rmx_locks.
 */
#define RTV_MTU         0x1     /* init or lock _mtu */
#define RTV_HOPCOUNT    0x2     /* init or lock _hopcount */
#define RTV_EXPIRE      0x4     /* init or lock _expire */
#define RTV_RPIPE       0x8     /* init or lock _recvpipe */
#define RTV_SPIPE       0x10    /* init or lock _sendpipe */
#define RTV_SSTHRESH    0x20    /* init or lock _ssthresh */
#define RTV_RTT         0x40    /* init or lock _rtt */
#define RTV_RTTVAR      0x80    /* init or lock _rttvar */

/*
 * Bitmask values for rtm_addrs.
 */
#define RTA_DST         0x1     /* destination sockaddr present */
#define RTA_GATEWAY     0x2     /* gateway sockaddr present */
#define RTA_NETMASK     0x4     /* netmask sockaddr present */
#define RTA_GENMASK     0x8     /* cloning mask sockaddr present */
#define RTA_IFP         0x10    /* interface name sockaddr present */
#define RTA_IFA         0x20    /* interface addr sockaddr present */
#define RTA_AUTHOR      0x40    /* sockaddr for author of redirect */
#define RTA_BRD         0x80    /* for NEWADDR, broadcast or p-p dest addr */

/*
 * Index offsets for sockaddr array for alternate internal encoding.
 */
#define RTAX_DST        0       /* destination sockaddr present */
#define RTAX_GATEWAY    1       /* gateway sockaddr present */
#define RTAX_NETMASK    2       /* netmask sockaddr present */
#define RTAX_GENMASK    3       /* cloning mask sockaddr present */
#define RTAX_IFP        4       /* interface name sockaddr present */
#define RTAX_IFA        5       /* interface addr sockaddr present */
#define RTAX_AUTHOR     6       /* sockaddr for author of redirect */
#define RTAX_BRD        7       /* for NEWADDR, broadcast or p-p dest addr */
#define RTAX_MAX        8       /* size of array to allocate */

struct rt_addrinfo {
	int     rti_addrs;
	struct  sockaddr *rti_info[RTAX_MAX];
};


#endif /* _NET_ROUTE_H_ */