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Annotation of Net2/net/route.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980, 1986 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)route.h     7.13 (Berkeley) 4/25/91
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Kernel resident routing tables.
        !            38:  * 
        !            39:  * The routing tables are initialized when interface addresses
        !            40:  * are set by making entries for all directly connected interfaces.
        !            41:  */
        !            42: 
        !            43: /*
        !            44:  * A route consists of a destination address and a reference
        !            45:  * to a routing entry.  These are often held by protocols
        !            46:  * in their control blocks, e.g. inpcb.
        !            47:  */
        !            48: struct route {
        !            49:        struct  rtentry *ro_rt;
        !            50:        struct  sockaddr ro_dst;
        !            51: };
        !            52: 
        !            53: /*
        !            54:  * These numbers are used by reliable protocols for determining
        !            55:  * retransmission behavior and are included in the routing structure.
        !            56:  */
        !            57: struct rt_metrics {
        !            58:        u_long  rmx_locks;      /* Kernel must leave these values alone */
        !            59:        u_long  rmx_mtu;        /* MTU for this path */
        !            60:        u_long  rmx_hopcount;   /* max hops expected */
        !            61:        u_long  rmx_expire;     /* lifetime for route, e.g. redirect */
        !            62:        u_long  rmx_recvpipe;   /* inbound delay-bandwith product */
        !            63:        u_long  rmx_sendpipe;   /* outbound delay-bandwith product */
        !            64:        u_long  rmx_ssthresh;   /* outbound gateway buffer limit */
        !            65:        u_long  rmx_rtt;        /* estimated round trip time */
        !            66:        u_long  rmx_rttvar;     /* estimated rtt variance */
        !            67: };
        !            68: 
        !            69: /*
        !            70:  * rmx_rtt and rmx_rttvar are stored as microseconds;
        !            71:  * RTTTOPRHZ(rtt) converts to a value suitable for use
        !            72:  * by a protocol slowtimo counter.
        !            73:  */
        !            74: #define        RTM_RTTUNIT     1000000 /* units for rtt, rttvar, as units per sec */
        !            75: #define        RTTTOPRHZ(r)    ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
        !            76: 
        !            77: /*
        !            78:  * We distinguish between routes to hosts and routes to networks,
        !            79:  * preferring the former if available.  For each route we infer
        !            80:  * the interface to use from the gateway address supplied when
        !            81:  * the route was entered.  Routes that forward packets through
        !            82:  * gateways are marked so that the output routines know to address the
        !            83:  * gateway rather than the ultimate destination.
        !            84:  */
        !            85: #ifndef RNF_NORMAL
        !            86: #include "radix.h"
        !            87: #endif
        !            88: struct rtentry {
        !            89:        struct  radix_node rt_nodes[2]; /* tree glue, and other values */
        !            90: #define        rt_key(r)       ((struct sockaddr *)((r)->rt_nodes->rn_key))
        !            91: #define        rt_mask(r)      ((struct sockaddr *)((r)->rt_nodes->rn_mask))
        !            92:        struct  sockaddr *rt_gateway;   /* value */
        !            93:        short   rt_flags;               /* up/down?, host/net */
        !            94:        short   rt_refcnt;              /* # held references */
        !            95:        u_long  rt_use;                 /* raw # packets forwarded */
        !            96:        struct  ifnet *rt_ifp;          /* the answer: interface to use */
        !            97:        struct  ifaddr *rt_ifa;         /* the answer: interface to use */
        !            98:        struct  sockaddr *rt_genmask;   /* for generation of cloned routes */
        !            99:        caddr_t rt_llinfo;              /* pointer to link level info cache */
        !           100:        struct  rt_metrics rt_rmx;      /* metrics used by rx'ing protocols */
        !           101:        short   rt_idle;                /* easy to tell llayer still live */
        !           102: };
        !           103: 
        !           104: /*
        !           105:  * Following structure necessary for 4.3 compatibility;
        !           106:  * We should eventually move it to a compat file.
        !           107:  */
        !           108: struct ortentry {
        !           109:        u_long  rt_hash;                /* to speed lookups */
        !           110:        struct  sockaddr rt_dst;        /* key */
        !           111:        struct  sockaddr rt_gateway;    /* value */
        !           112:        short   rt_flags;               /* up/down?, host/net */
        !           113:        short   rt_refcnt;              /* # held references */
        !           114:        u_long  rt_use;                 /* raw # packets forwarded */
        !           115:        struct  ifnet *rt_ifp;          /* the answer: interface to use */
        !           116: };
        !           117: 
        !           118: #define        RTF_UP          0x1             /* route useable */
        !           119: #define        RTF_GATEWAY     0x2             /* destination is a gateway */
        !           120: #define        RTF_HOST        0x4             /* host entry (net otherwise) */
        !           121: #define        RTF_REJECT      0x8             /* host or net unreachable */
        !           122: #define        RTF_DYNAMIC     0x10            /* created dynamically (by redirect) */
        !           123: #define        RTF_MODIFIED    0x20            /* modified dynamically (by redirect) */
        !           124: #define RTF_DONE       0x40            /* message confirmed */
        !           125: #define RTF_MASK       0x80            /* subnet mask present */
        !           126: #define RTF_CLONING    0x100           /* generate new routes on use */
        !           127: #define RTF_XRESOLVE   0x200           /* external daemon resolves name */
        !           128: #define RTF_LLINFO     0x400           /* generated by ARP or ESIS */
        !           129: #define RTF_PROTO2     0x4000          /* protocol specific routing flag */
        !           130: #define RTF_PROTO1     0x8000          /* protocol specific routing flag */
        !           131: 
        !           132: 
        !           133: /*
        !           134:  * Routing statistics.
        !           135:  */
        !           136: struct rtstat {
        !           137:        short   rts_badredirect;        /* bogus redirect calls */
        !           138:        short   rts_dynamic;            /* routes created by redirects */
        !           139:        short   rts_newgateway;         /* routes modified by redirects */
        !           140:        short   rts_unreach;            /* lookups which failed */
        !           141:        short   rts_wildcard;           /* lookups satisfied by a wildcard */
        !           142: };
        !           143: /*
        !           144:  * Structures for routing messages.
        !           145:  */
        !           146: struct rt_msghdr {
        !           147:        u_short rtm_msglen;     /* to skip over non-understood messages */
        !           148:        u_char  rtm_version;    /* future binary compatability */
        !           149:        u_char  rtm_type;       /* message type */
        !           150:        u_short rtm_index;      /* index for associated ifp */
        !           151:        pid_t   rtm_pid;        /* identify sender */
        !           152:        int     rtm_addrs;      /* bitmask identifying sockaddrs in msg */
        !           153:        int     rtm_seq;        /* for sender to identify action */
        !           154:        int     rtm_errno;      /* why failed */
        !           155:        int     rtm_flags;      /* flags, incl. kern & message, e.g. DONE */
        !           156:        int     rtm_use;        /* from rtentry */
        !           157:        u_long  rtm_inits;      /* which metrics we are initializing */
        !           158:        struct  rt_metrics rtm_rmx; /* metrics themselves */
        !           159: };
        !           160: 
        !           161: struct route_cb {
        !           162:        int     ip_count;
        !           163:        int     ns_count;
        !           164:        int     iso_count;
        !           165:        int     any_count;
        !           166: };
        !           167: #define RTM_VERSION    2       /* Up the ante and ignore older versions */
        !           168: 
        !           169: #define RTM_ADD                0x1     /* Add Route */
        !           170: #define RTM_DELETE     0x2     /* Delete Route */
        !           171: #define RTM_CHANGE     0x3     /* Change Metrics or flags */
        !           172: #define RTM_GET                0x4     /* Report Metrics */
        !           173: #define RTM_LOSING     0x5     /* Kernel Suspects Partitioning */
        !           174: #define RTM_REDIRECT   0x6     /* Told to use different route */
        !           175: #define RTM_MISS       0x7     /* Lookup failed on this address */
        !           176: #define RTM_LOCK       0x8     /* fix specified metrics */
        !           177: #define RTM_OLDADD     0x9     /* caused by SIOCADDRT */
        !           178: #define RTM_OLDDEL     0xa     /* caused by SIOCDELRT */
        !           179: #define RTM_RESOLVE    0xb     /* req to resolve dst to LL addr */
        !           180: 
        !           181: #define RTV_MTU                0x1     /* init or lock _mtu */
        !           182: #define RTV_HOPCOUNT   0x2     /* init or lock _hopcount */
        !           183: #define RTV_EXPIRE     0x4     /* init or lock _hopcount */
        !           184: #define RTV_RPIPE      0x8     /* init or lock _recvpipe */
        !           185: #define RTV_SPIPE      0x10    /* init or lock _sendpipe */
        !           186: #define RTV_SSTHRESH   0x20    /* init or lock _ssthresh */
        !           187: #define RTV_RTT                0x40    /* init or lock _rtt */
        !           188: #define RTV_RTTVAR     0x80    /* init or lock _rttvar */
        !           189: 
        !           190: #define RTA_DST                0x1     /* destination sockaddr present */
        !           191: #define RTA_GATEWAY    0x2     /* gateway sockaddr present */
        !           192: #define RTA_NETMASK    0x4     /* netmask sockaddr present */
        !           193: #define RTA_GENMASK    0x8     /* cloning mask sockaddr present */
        !           194: #define RTA_IFP                0x10    /* interface name sockaddr present */
        !           195: #define RTA_IFA                0x20    /* interface addr sockaddr present */
        !           196: #define RTA_AUTHOR     0x40    /* sockaddr for author of redirect */
        !           197: 
        !           198: #ifdef KERNEL
        !           199: struct route_cb route_cb;
        !           200: #endif
        !           201: 
        !           202: #ifdef KERNEL
        !           203: #define        RTFREE(rt) \
        !           204:        if ((rt)->rt_refcnt <= 1) \
        !           205:                rtfree(rt); \
        !           206:        else \
        !           207:                (rt)->rt_refcnt--;
        !           208: 
        !           209: #ifdef GATEWAY
        !           210: #define        RTHASHSIZ       64
        !           211: #else
        !           212: #define        RTHASHSIZ       8
        !           213: #endif
        !           214: #if    (RTHASHSIZ & (RTHASHSIZ - 1)) == 0
        !           215: #define RTHASHMOD(h)   ((h) & (RTHASHSIZ - 1))
        !           216: #else
        !           217: #define RTHASHMOD(h)   ((h) % RTHASHSIZ)
        !           218: #endif
        !           219: struct mbuf *rthost[RTHASHSIZ];
        !           220: struct mbuf *rtnet[RTHASHSIZ];
        !           221: struct rtstat  rtstat;
        !           222: struct rtentry *rtalloc1();
        !           223: #endif

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