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Annotation of 43BSDReno/sys/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 is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)route.h     7.11 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: /*
        !            24:  * Kernel resident routing tables.
        !            25:  * 
        !            26:  * The routing tables are initialized when interface addresses
        !            27:  * are set by making entries for all directly connected interfaces.
        !            28:  */
        !            29: 
        !            30: /*
        !            31:  * A route consists of a destination address and a reference
        !            32:  * to a routing entry.  These are often held by protocols
        !            33:  * in their control blocks, e.g. inpcb.
        !            34:  */
        !            35: struct route {
        !            36:        struct  rtentry *ro_rt;
        !            37:        struct  sockaddr ro_dst;
        !            38: };
        !            39: 
        !            40: /*
        !            41:  * These numbers are used by reliable protocols for determining
        !            42:  * retransmission behavior and are included in the routing structure.
        !            43:  */
        !            44: struct rt_metrics {
        !            45:        u_long  rmx_locks;      /* Kernel must leave these values alone */
        !            46:        u_long  rmx_mtu;        /* MTU for this path */
        !            47:        u_long  rmx_hopcount;   /* max hops expected */
        !            48:        u_long  rmx_expire;     /* lifetime for route, e.g. redirect */
        !            49:        u_long  rmx_recvpipe;   /* inbound delay-bandwith product */
        !            50:        u_long  rmx_sendpipe;   /* outbound delay-bandwith product */
        !            51:        u_long  rmx_ssthresh;   /* outbound gateway buffer limit */
        !            52:        u_long  rmx_rtt;        /* estimated round trip time */
        !            53:        u_long  rmx_rttvar;     /* estimated rtt variance */
        !            54: };
        !            55: 
        !            56: /*
        !            57:  * rmx_rtt and rmx_rttvar are stored as microseconds;
        !            58:  * RTTTOPRHZ(rtt) converts to a value suitable for use
        !            59:  * by a protocol slowtimo counter.
        !            60:  */
        !            61: #define        RTM_RTTUNIT     1000000 /* units for rtt, rttvar, as units per sec */
        !            62: #define        RTTTOPRHZ(r)    ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
        !            63: 
        !            64: /*
        !            65:  * We distinguish between routes to hosts and routes to networks,
        !            66:  * preferring the former if available.  For each route we infer
        !            67:  * the interface to use from the gateway address supplied when
        !            68:  * the route was entered.  Routes that forward packets through
        !            69:  * gateways are marked so that the output routines know to address the
        !            70:  * gateway rather than the ultimate destination.
        !            71:  */
        !            72: #include "radix.h"
        !            73: struct rtentry {
        !            74:        struct  radix_node rt_nodes[2]; /* tree glue, and other values */
        !            75: #define        rt_key(r)       ((struct sockaddr *)((r)->rt_nodes->rn_key))
        !            76: #define        rt_mask(r)      ((struct sockaddr *)((r)->rt_nodes->rn_mask))
        !            77:        struct  sockaddr *rt_gateway;   /* value */
        !            78:        short   rt_flags;               /* up/down?, host/net */
        !            79:        short   rt_refcnt;              /* # held references */
        !            80:        u_long  rt_use;                 /* raw # packets forwarded */
        !            81:        struct  ifnet *rt_ifp;          /* the answer: interface to use */
        !            82:        struct  ifaddr *rt_ifa;         /* the answer: interface to use */
        !            83:        struct  sockaddr *rt_genmask;   /* for generation of cloned routes */
        !            84:        caddr_t rt_llinfo;              /* pointer to link level info cache */
        !            85:        struct  rt_metrics rt_rmx;      /* metrics used by rx'ing protocols */
        !            86:        short   rt_idle;                /* easy to tell llayer still live */
        !            87: };
        !            88: 
        !            89: /*
        !            90:  * Following structure necessary for 4.3 compatibility;
        !            91:  * We should eventually move it to a compat file.
        !            92:  */
        !            93: struct ortentry {
        !            94:        u_long  rt_hash;                /* to speed lookups */
        !            95:        struct  sockaddr rt_dst;        /* key */
        !            96:        struct  sockaddr rt_gateway;    /* value */
        !            97:        short   rt_flags;               /* up/down?, host/net */
        !            98:        short   rt_refcnt;              /* # held references */
        !            99:        u_long  rt_use;                 /* raw # packets forwarded */
        !           100:        struct  ifnet *rt_ifp;          /* the answer: interface to use */
        !           101: };
        !           102: 
        !           103: #define        RTF_UP          0x1             /* route useable */
        !           104: #define        RTF_GATEWAY     0x2             /* destination is a gateway */
        !           105: #define        RTF_HOST        0x4             /* host entry (net otherwise) */
        !           106: #define        RTF_DYNAMIC     0x10            /* created dynamically (by redirect) */
        !           107: #define        RTF_MODIFIED    0x20            /* modified dynamically (by redirect) */
        !           108: #define RTF_DONE       0x40            /* message confirmed */
        !           109: #define RTF_MASK       0x80            /* subnet mask present */
        !           110: #define RTF_CLONING    0x100           /* generate new routes on use */
        !           111: #define RTF_XRESOLVE   0x200           /* external daemon resolves name */
        !           112: #define RTF_LLINFO     0x400           /* generated by ARP or ESIS */
        !           113: 
        !           114: 
        !           115: /*
        !           116:  * Routing statistics.
        !           117:  */
        !           118: struct rtstat {
        !           119:        short   rts_badredirect;        /* bogus redirect calls */
        !           120:        short   rts_dynamic;            /* routes created by redirects */
        !           121:        short   rts_newgateway;         /* routes modified by redirects */
        !           122:        short   rts_unreach;            /* lookups which failed */
        !           123:        short   rts_wildcard;           /* lookups satisfied by a wildcard */
        !           124: };
        !           125: /*
        !           126:  * Structures for routing messages.
        !           127:  */
        !           128: struct rt_msghdr {
        !           129:        u_short rtm_msglen;     /* to skip over non-understood messages */
        !           130:        u_char  rtm_version;    /* future binary compatability */
        !           131:        u_char  rtm_type;       /* message type */
        !           132:        u_short rtm_index;      /* index for associated ifp */
        !           133:        pid_t   rtm_pid;        /* identify sender */
        !           134:        int     rtm_addrs;      /* bitmask identifying sockaddrs in msg */
        !           135:        int     rtm_seq;        /* for sender to identify action */
        !           136:        int     rtm_errno;      /* why failed */
        !           137:        int     rtm_flags;      /* flags, incl. kern & message, e.g. DONE */
        !           138:        int     rtm_use;        /* from rtentry */
        !           139:        u_long  rtm_inits;      /* which metrics we are initializing */
        !           140:        struct  rt_metrics rtm_rmx; /* metrics themselves */
        !           141: };
        !           142: 
        !           143: struct route_cb {
        !           144:        int     ip_count;
        !           145:        int     ns_count;
        !           146:        int     iso_count;
        !           147:        int     any_count;
        !           148: };
        !           149: #define RTM_VERSION    2       /* Up the ante and ignore older versions */
        !           150: 
        !           151: #define RTM_ADD                0x1     /* Add Route */
        !           152: #define RTM_DELETE     0x2     /* Delete Route */
        !           153: #define RTM_CHANGE     0x3     /* Change Metrics or flags */
        !           154: #define RTM_GET                0x4     /* Report Metrics */
        !           155: #define RTM_LOSING     0x5     /* Kernel Suspects Partitioning */
        !           156: #define RTM_REDIRECT   0x6     /* Told to use different route */
        !           157: #define RTM_MISS       0x7     /* Lookup failed on this address */
        !           158: #define RTM_LOCK       0x8     /* fix specified metrics */
        !           159: #define RTM_OLDADD     0x9     /* caused by SIOCADDRT */
        !           160: #define RTM_OLDDEL     0xa     /* caused by SIOCDELRT */
        !           161: #define RTM_RESOLVE    0xb     /* req to resolve dst to LL addr */
        !           162: 
        !           163: #define RTV_MTU                0x1     /* init or lock _mtu */
        !           164: #define RTV_HOPCOUNT   0x2     /* init or lock _hopcount */
        !           165: #define RTV_EXPIRE     0x4     /* init or lock _hopcount */
        !           166: #define RTV_RPIPE      0x8     /* init or lock _recvpipe */
        !           167: #define RTV_SPIPE      0x10    /* init or lock _sendpipe */
        !           168: #define RTV_SSTHRESH   0x20    /* init or lock _ssthresh */
        !           169: #define RTV_RTT                0x40    /* init or lock _rtt */
        !           170: #define RTV_RTTVAR     0x80    /* init or lock _rttvar */
        !           171: 
        !           172: #define RTA_DST                0x1     /* destination sockaddr present */
        !           173: #define RTA_GATEWAY    0x2     /* gateway sockaddr present */
        !           174: #define RTA_NETMASK    0x4     /* netmask sockaddr present */
        !           175: #define RTA_GENMASK    0x8     /* cloning mask sockaddr present */
        !           176: #define RTA_IFP                0x10    /* interface name sockaddr present */
        !           177: #define RTA_IFA                0x20    /* interface addr sockaddr present */
        !           178: #define RTA_AUTHOR     0x40    /* sockaddr for author of redirect */
        !           179: 
        !           180: #ifdef KERNEL
        !           181: struct route_cb route_cb;
        !           182: #endif
        !           183: 
        !           184: #ifdef KERNEL
        !           185: #define        RTFREE(rt) \
        !           186:        if ((rt)->rt_refcnt <= 1) \
        !           187:                rtfree(rt); \
        !           188:        else \
        !           189:                (rt)->rt_refcnt--;
        !           190: 
        !           191: #ifdef GATEWAY
        !           192: #define        RTHASHSIZ       64
        !           193: #else
        !           194: #define        RTHASHSIZ       8
        !           195: #endif
        !           196: #if    (RTHASHSIZ & (RTHASHSIZ - 1)) == 0
        !           197: #define RTHASHMOD(h)   ((h) & (RTHASHSIZ - 1))
        !           198: #else
        !           199: #define RTHASHMOD(h)   ((h) % RTHASHSIZ)
        !           200: #endif
        !           201: struct mbuf *rthost[RTHASHSIZ];
        !           202: struct mbuf *rtnet[RTHASHSIZ];
        !           203: struct rtstat  rtstat;
        !           204: struct rtentry *rtalloc1();
        !           205: #endif

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