FreeBSD/Linux Kernel Cross Reference
sys/net/route.h

     /*-
      * 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.
     * 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
     * $FreeBSD$
     */
    
    #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_lite {
            u_long  rmx_mtu;        /* MTU for this path */
            u_long  rmx_expire;     /* lifetime for route, e.g. redirect */
            u_long  rmx_pksent;     /* packets sent using this route */
    };
    
    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))
    
    extern u_int rt_numfibs;        /* number fo usable routing tables */
    extern u_int tunnel_fib;        /* tunnels use these */
    extern u_int fwd_fib;           /* packets being forwarded use these routes */
    /*
     * 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 */
           /*
            * XXX struct rtentry must begin with a struct radix_node (or two!)
            * because the code does some casts of a 'struct radix_node *'
            * to a 'struct rtentry *'
            */
   #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 */
           u_long  rt_flags;               /* up/down?, host/net */
           struct  ifnet *rt_ifp;          /* the answer: interface to use */
           struct  ifaddr *rt_ifa;         /* the answer: interface address to use */
           struct  rt_metrics_lite rt_rmx; /* metrics used by rx'ing protocols */
           long    rt_refcnt;              /* # held references */
           struct  sockaddr *rt_genmask;   /* for generation of cloned routes */
           caddr_t rt_llinfo;              /* pointer to link level info cache */
           struct  rtentry *rt_gwroute;    /* implied entry for gatewayed routes */
           struct  rtentry *rt_parent;     /* cloning parent of this route */
           u_int   rt_fibnum;              /* which FIB */
   #ifdef _KERNEL
           /* XXX ugly, user apps use this definition but don't have a mtx def */
           struct  mtx rt_mtx;             /* mutex for routing entry */
   #endif
   };
   
   /*
    * 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 */
   
   /* XXX: temporary to stay API/ABI compatible with userland */
   #ifndef _KERNEL
   #define RTF_PRCLONING   0x10000         /* unused, for compatibility */
   #endif
   
   #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 */
   
   /* Mask of RTF flags that are allowed to be modified by RTM_CHANGE. */
   #define RTF_FMASK       \
           (RTF_PROTO1 | RTF_PROTO2 | RTF_PROTO3 | RTF_BLACKHOLE | \
            RTF_REJECT | RTF_STATIC)
   
   /*
    * 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_fmask;      /* bitmask used in RTM_CHANGE message */
   #define rtm_use rtm_fmask       /* deprecated, use rtm_rmx->rmx_pksent */
           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 */
   #define RTM_IEEE80211   0x12    /* IEEE80211 wireless event */
   
   /*
    * 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;
   };
   
   /*
    * This macro returns the size of a struct sockaddr when passed
    * through a routing socket. Basically we round up sa_len to
    * a multiple of sizeof(long), with a minimum of sizeof(long).
    * The check for a NULL pointer is just a convenience, probably never used.
    * The case sa_len == 0 should only apply to empty structures.
    */
   #define SA_SIZE(sa)                                             \
       (  (!(sa) || ((struct sockaddr *)(sa))->sa_len == 0) ?      \
           sizeof(long)            :                               \
           1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) )
   
   #ifdef _KERNEL
   
   #define RT_LOCK_INIT(_rt) \
           mtx_init(&(_rt)->rt_mtx, "rtentry", NULL, MTX_DEF | MTX_DUPOK)
   #define RT_LOCK(_rt)            mtx_lock(&(_rt)->rt_mtx)
   #define RT_TRYLOCK(_rt)         mtx_trylock(&(_rt)->rt_mtx)
   #define RT_UNLOCK(_rt)          mtx_unlock(&(_rt)->rt_mtx)
   #define RT_LOCK_DESTROY(_rt)    mtx_destroy(&(_rt)->rt_mtx)
   #define RT_LOCK_ASSERT(_rt)     mtx_assert(&(_rt)->rt_mtx, MA_OWNED)
   
   #define RT_ADDREF(_rt)  do {                                    \
           RT_LOCK_ASSERT(_rt);                                    \
           KASSERT((_rt)->rt_refcnt >= 0,                          \
                   ("negative refcnt %ld", (_rt)->rt_refcnt));     \
           (_rt)->rt_refcnt++;                                     \
   } while (0)
   #define RT_REMREF(_rt)  do {                                    \
           RT_LOCK_ASSERT(_rt);                                    \
           KASSERT((_rt)->rt_refcnt > 0,                           \
                   ("bogus refcnt %ld", (_rt)->rt_refcnt));        \
           (_rt)->rt_refcnt--;                                     \
   } while (0)
   
   #define RTFREE_LOCKED(_rt) do {                                 \
           if ((_rt)->rt_refcnt <= 1)                              \
                   rtfree(_rt);                                    \
           else {                                                  \
                   RT_REMREF(_rt);                                 \
                   RT_UNLOCK(_rt);                                 \
           }                                                       \
           /* guard against invalid refs */                        \
           _rt = 0;                                                \
   } while (0)
   #define RTFREE(_rt) do {                                        \
           RT_LOCK(_rt);                                           \
           RTFREE_LOCKED(_rt);                                     \
   } while (0)
   
   #define RT_TEMP_UNLOCK(_rt) do {                                \
           RT_ADDREF(_rt);                                         \
           RT_UNLOCK(_rt);                                         \
   } while (0)
   
   #define RT_RELOCK(_rt) do {                                     \
           RT_LOCK(_rt);                                           \
           if ((_rt)->rt_refcnt <= 1) {                            \
                   rtfree(_rt);                                    \
                   _rt = 0; /*  signal that it went away */        \
           } else {                                                \
                   RT_REMREF(_rt);                                 \
                   /* note that _rt is still valid */              \
           }                                                       \
   } while (0)
   
   extern struct radix_node_head *rt_tables[][AF_MAX+1];
   
   struct ifmultiaddr;
   
   void     rt_ieee80211msg(struct ifnet *, int, void *, size_t);
   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 *);
   
   /*
    * Note the following locking behavior:
    *
    *    rtalloc_ign() and rtalloc() return ro->ro_rt unlocked
    *
    *    rtalloc1() returns a locked rtentry
    *
    *    rtfree() and RTFREE_LOCKED() require a locked rtentry
    *
    *    RTFREE() uses an unlocked entry.
    */
   
   int      rtexpunge(struct rtentry *);
   void     rtfree(struct rtentry *);
   int      rt_check(struct rtentry **, struct rtentry **, struct sockaddr *);
   
   /* XXX MRT COMPAT VERSIONS THAT SET UNIVERSE to 0 */
   /* Thes are used by old code not yet converted to use multiple FIBS */
   int      rt_getifa(struct rt_addrinfo *);
   void     rtalloc_ign(struct route *ro, u_long ignflags);
   void     rtalloc(struct route *ro); /* XXX deprecated, use rtalloc_ign(ro, 0) */
   struct rtentry *rtalloc1(struct sockaddr *, int, u_long);
   int      rtinit(struct ifaddr *, int, int);
   int      rtioctl(u_long, caddr_t);
   void     rtredirect(struct sockaddr *, struct sockaddr *,
               struct sockaddr *, int, struct sockaddr *);
   int      rtrequest(int, struct sockaddr *,
               struct sockaddr *, struct sockaddr *, int, struct rtentry **);
   int      rtrequest1(int, struct rt_addrinfo *, struct rtentry **);
   
   /* defaults to "all" FIBs */
   int      rtinit_fib(struct ifaddr *, int, int);
   
   /* XXX MRT NEW VERSIONS THAT USE FIBs
    * For now the protocol indepedent versions are the same as the AF_INET ones
    * but this will change.. 
    */
   int      rt_getifa_fib(struct rt_addrinfo *, u_int fibnum);
   void     rtalloc_ign_fib(struct route *ro, u_long ignflags, u_int fibnum);
   void     rtalloc_fib(struct route *ro, u_int fibnum);
   struct rtentry *rtalloc1_fib(struct sockaddr *, int, u_long, u_int);
   int      rtioctl_fib(u_long, caddr_t, u_int);
   void     rtredirect_fib(struct sockaddr *, struct sockaddr *,
               struct sockaddr *, int, struct sockaddr *, u_int);
   int      rtrequest_fib(int, struct sockaddr *,
               struct sockaddr *, struct sockaddr *, int, struct rtentry **, u_int);
   int      rtrequest1_fib(int, struct rt_addrinfo *, struct rtentry **, u_int);
   
   #include <sys/eventhandler.h>
   typedef void (*rtevent_arp_update_fn)(void *, struct rtentry *, uint8_t *, struct sockaddr *);
   typedef void (*rtevent_redirect_fn)(void *, struct rtentry *, struct rtentry *, struct sockaddr *);
   EVENTHANDLER_DECLARE(route_arp_update_event, rtevent_arp_update_fn);
   EVENTHANDLER_DECLARE(route_redirect_event, rtevent_redirect_fn);
   #endif
   
   #endif

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