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/*

 * 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     8.4 (Berkeley) 1/9/95

 * $FreeBSD: src/sys/net/route.h,v 1.45 2002/03/24 09:34:04 bde Exp $

 */

#ifndef _NET_ROUTE_H_

#define _NET_ROUTE_H_

/*

 * Kernel resident routing tables.

 *

 * The routing tables are initialized when interface addresses

 * are set by making entries for all directly connected interfaces.

 */

/*

 * A route consists of a destination address and a reference

 * to a routing entry.  These are often held by protocols

 * in their control blocks, e.g. inpcb.

 */

struct route {

        struct  rtentry *ro_rt;

        struct  sockaddr ro_dst;

};

/*

 * These numbers are used by reliable protocols for determining

 * retransmission behavior and are included in the routing structure.

 */

struct rt_metrics {

        u_long  rmx_locks;      /* Kernel must leave these values alone */

        u_long  rmx_mtu;        /* MTU for this path */

        u_long  rmx_hopcount;   /* max hops expected */

        u_long  rmx_expire;     /* lifetime for route, e.g. redirect */

        u_long  rmx_recvpipe;   /* inbound delay-bandwidth product */

        u_long  rmx_sendpipe;   /* outbound delay-bandwidth product */

        u_long  rmx_ssthresh;   /* outbound gateway buffer limit */

        u_long  rmx_rtt;        /* estimated round trip time */

        u_long  rmx_rttvar;     /* estimated rtt variance */

        u_long  rmx_pksent;     /* packets sent using this route */

        u_long  rmx_filler[4];  /* will be used for T/TCP later */

};

/*

 * rmx_rtt and rmx_rttvar are stored as microseconds;

 * RTTTOPRHZ(rtt) converts to a value suitable for use

 * by a protocol slowtimo counter.

 */

#define RTM_RTTUNIT     1000000 /* units for rtt, rttvar, as units per sec */

#define RTTTOPRHZ(r)    ((r) / (RTM_RTTUNIT / PR_SLOWHZ))

/*

 * XXX kernel function pointer `rt_output' is visible to applications.

 */

struct mbuf;

/*

 * We distinguish between routes to hosts and routes to networks,

 * preferring the former if available.  For each route we infer

 * the interface to use from the gateway address supplied when

 * the route was entered.  Routes that forward packets through

 * gateways are marked so that the output routines know to address the

 * gateway rather than the ultimate destination.

 */

#ifndef RNF_NORMAL

#include <net/radix.h>

#endif

struct rtentry {

        struct  radix_node rt_nodes[2]; /* tree glue, and other values */

#define rt_key(r)       ((struct sockaddr *)((r)->rt_nodes->rn_key))

#define rt_mask(r)      ((struct sockaddr *)((r)->rt_nodes->rn_mask))

        struct  sockaddr *rt_gateway;   /* value */

        long    rt_refcnt;              /* # held references */

        u_long  rt_flags;               /* up/down?, host/net */

        struct  ifnet *rt_ifp;          /* the answer: interface to use */

        struct  ifaddr *rt_ifa;         /* the answer: interface to use */

        struct  sockaddr *rt_genmask;   /* for generation of cloned routes */

        caddr_t rt_llinfo;              /* pointer to link level info cache */

        struct  rt_metrics rt_rmx;      /* metrics used by rx'ing protocols */

        struct  rtentry *rt_gwroute;    /* implied entry for gatewayed routes */

        int     (*rt_output)(struct ifnet *, struct mbuf *, struct sockaddr *,

                    struct rtentry *);

                                        /* output routine for this (rt,if) */

        struct  rtentry *rt_parent;     /* cloning parent of this route */

        void    *rt_filler2;            /* more filler */

};

/*

 * Following structure necessary for 4.3 compatibility;

 * We should eventually move it to a compat file.

 */

struct ortentry {

        u_long  rt_hash;                /* to speed lookups */

        struct  sockaddr rt_dst;        /* key */

        struct  sockaddr rt_gateway;    /* value */

        short   rt_flags;               /* up/down?, host/net */

        short   rt_refcnt;              /* # held references */

        u_long  rt_use;                 /* raw # packets forwarded */

        struct  ifnet *rt_ifp;          /* the answer: interface to use */

};

#define rt_use rt_rmx.rmx_pksent

#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 */

/*                      0x80               unused, was RTF_DELCLONE */

#define RTF_CLONING     0x100           /* generate new routes on use */

#define RTF_XRESOLVE    0x200           /* external daemon resolves name */

#define RTF_LLINFO      0x400           /* generated by link layer (e.g. ARP) */

#define RTF_STATIC      0x800           /* manually added */

#define RTF_BLACKHOLE   0x1000          /* just discard pkts (during updates) */

#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 */

                                        /* 0x1000000 and up unassigned */

/*

 * 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 */

};

/*

 * 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_long  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     /* Kernel Suspects Partitioning */

#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_IFANNOUNCE  0x11    /* iface arrival/departure */

/*

 * 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];

        int     rti_flags;

        struct  ifaddr *rti_ifa;

        struct  ifnet *rti_ifp;

};

struct route_cb {

        int     ip_count;

        int     ip6_count;

        int     ipx_count;

        int     ns_count;

        int     any_count;

};

#ifdef _KERNEL

#define RTFREE(rt) \

        do { \

                if ((rt)->rt_refcnt <= 1) \

                        rtfree(rt); \

                else \

                        (rt)->rt_refcnt--; \

        } while (0)

extern struct route_cb route_cb;

extern struct radix_node_head *rt_tables[AF_MAX+1];

struct ifmultiaddr;

void     route_init(void);

int      rt_getifa(struct rt_addrinfo *);

void     rt_ifannouncemsg(struct ifnet *, int);

void     rt_ifmsg(struct ifnet *);

void     rt_missmsg(int, struct rt_addrinfo *, int, int);

void     rt_newaddrmsg(int, struct ifaddr *, int, struct rtentry *);

void     rt_newmaddrmsg(int, struct ifmultiaddr *);

int      rt_setgate(struct rtentry *, struct sockaddr *, struct sockaddr *);

void     rtalloc(struct route *);

void     rtalloc_ign(struct route *, u_long);

struct rtentry *

         rtalloc1(struct sockaddr *, int, u_long);

void     rtfree(struct rtentry *);

int      rtinit(struct ifaddr *, int, int);

int      rtioctl(u_long, caddr_t);

void     rtredirect(struct sockaddr *, struct sockaddr *,

            struct sockaddr *, int, struct sockaddr *, struct rtentry **);

int      rtrequest(int, struct sockaddr *,

            struct sockaddr *, struct sockaddr *, int, struct rtentry **);

int      rtrequest1(int, struct rt_addrinfo *, struct rtentry **);

#endif

#endif