FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_var.h

     /*
      * Copyright (c) 1985, 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.
     *
     *      @(#)in_var.h    8.2 (Berkeley) 1/9/95
     * $FreeBSD: src/sys/netinet/in_var.h,v 1.17.4.1 1999/09/05 08:18:23 peter Exp $
     */
    
    #ifndef _NETINET_IN_VAR_H_
    #define _NETINET_IN_VAR_H_
    
    #include <sys/queue.h>
    
    /*
     * Interface address, Internet version.  One of these structures
     * is allocated for each interface with an Internet address.
     * The ifaddr structure contains the protocol-independent part
     * of the structure and is assumed to be first.
     */
    struct in_ifaddr {
            struct  ifaddr ia_ifa;          /* protocol-independent info */
    #define ia_ifp          ia_ifa.ifa_ifp
    #define ia_flags        ia_ifa.ifa_flags
                                            /* ia_{,sub}net{,mask} in host order */
            u_long  ia_net;                 /* network number of interface */
            u_long  ia_netmask;             /* mask of net part */
            u_long  ia_subnet;              /* subnet number, including net */
            u_long  ia_subnetmask;          /* mask of subnet part */
            struct  in_addr ia_netbroadcast; /* to recognize net broadcasts */
            struct  in_ifaddr *ia_next;     /* next in list of internet addresses */
            struct  sockaddr_in ia_addr;    /* reserve space for interface name */
            struct  sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
    #define ia_broadaddr    ia_dstaddr
            struct  sockaddr_in ia_sockmask; /* reserve space for general netmask */
            LIST_HEAD(in_multihead, in_multi) ia_multiaddrs;
                                            /* list of multicast addresses */
    };
    
    struct  in_aliasreq {
            char    ifra_name[IFNAMSIZ];            /* if name, e.g. "en0" */
            struct  sockaddr_in ifra_addr;
            struct  sockaddr_in ifra_broadaddr;
    #define ifra_dstaddr ifra_broadaddr
            struct  sockaddr_in ifra_mask;
    };
    /*
     * Given a pointer to an in_ifaddr (ifaddr),
     * return a pointer to the addr as a sockaddr_in.
     */
    #define IA_SIN(ia)    (&(((struct in_ifaddr *)(ia))->ia_addr))
    #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
    
    #define IN_LNAOF(in, ifa) \
            ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
    
    
    #ifdef  KERNEL
    extern  struct  in_ifaddr *in_ifaddr;
    extern  struct  ifqueue ipintrq;                /* ip packet input queue */
    extern  struct  in_addr zeroin_addr;
    extern  u_char  inetctlerrmap[];
    extern  int rtq_reallyold;      /* XXX */
    extern  int rtq_minreallyold;   /* XXX */
    extern  int rtq_toomany;        /* XXX */
    
    /*
     * Macro for finding the interface (ifnet structure) corresponding to one
     * of our IP addresses.
     */
    #define INADDR_TO_IFP(addr, ifp) \
            /* struct in_addr addr; */ \
           /* struct ifnet *ifp; */ \
   { \
           register struct in_ifaddr *ia; \
   \
           for (ia = in_ifaddr; \
               ia != NULL && ((ia->ia_ifp->if_flags & IFF_POINTOPOINT)? \
                   IA_DSTSIN(ia):IA_SIN(ia))->sin_addr.s_addr != (addr).s_addr; \
               ia = ia->ia_next) \
                    continue; \
           if (ia == NULL) \
               for (ia = in_ifaddr; \
                   ia != NULL; \
                   ia = ia->ia_next) \
                       if (ia->ia_ifp->if_flags & IFF_POINTOPOINT && \
                           IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
                               break; \
           (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
   }
   
   /*
    * Macro for finding the internet address structure (in_ifaddr) corresponding
    * to a given interface (ifnet structure).
    */
   #define IFP_TO_IA(ifp, ia) \
           /* struct ifnet *ifp; */ \
           /* struct in_ifaddr *ia; */ \
   { \
           for ((ia) = in_ifaddr; \
               (ia) != NULL && (ia)->ia_ifp != (ifp); \
               (ia) = (ia)->ia_next) \
                   continue; \
   }
   #endif
   
   /*
    * This information should be part of the ifnet structure but we don't wish
    * to change that - as it might break a number of things
    */
   
   struct router_info {
           struct ifnet *rti_ifp;
           int    rti_type; /* type of router which is querier on this interface */
           int    rti_time; /* # of slow timeouts since last old query */
           struct router_info *rti_next;
   };
   
   /*
    * Internet multicast address structure.  There is one of these for each IP
    * multicast group to which this host belongs on a given network interface.
    * They are kept in a linked list, rooted in the interface's in_ifaddr
    * structure.
    */
   struct in_multi {
           LIST_ENTRY(in_multi) inm_entry; /* list glue */
           struct  in_addr inm_addr;       /* IP multicast address */
           struct  ifnet *inm_ifp;         /* back pointer to ifnet */
           struct  in_ifaddr *inm_ia;      /* back pointer to in_ifaddr */
           u_int   inm_refcount;           /* no. membership claims by sockets */
           u_int   inm_timer;              /* IGMP membership report timer */
           u_int   inm_state;              /*  state of the membership */
           struct  router_info *inm_rti;   /* router info*/
   };
   
   #ifdef KERNEL
   /*
    * Structure used by macros below to remember position when stepping through
    * all of the in_multi records.
    */
   struct in_multistep {
           struct in_ifaddr *i_ia;
           struct in_multi *i_inm;
   };
   
   /*
    * Macro for looking up the in_multi record for a given IP multicast address
    * on a given interface.  If no matching record is found, "inm" returns NULL.
    */
   #define IN_LOOKUP_MULTI(addr, ifp, inm) \
           /* struct in_addr addr; */ \
           /* struct ifnet *ifp; */ \
           /* struct in_multi *inm; */ \
   { \
           register struct in_ifaddr *ia; \
   \
           IFP_TO_IA((ifp), ia); \
           if (ia == NULL) \
                   (inm) = NULL; \
           else \
                   for ((inm) = ia->ia_multiaddrs.lh_first; \
                       (inm) != NULL && (inm)->inm_addr.s_addr != (addr).s_addr; \
                        (inm) = inm->inm_entry.le_next) \
                            continue; \
   }
   
   /*
    * Macro to step through all of the in_multi records, one at a time.
    * The current position is remembered in "step", which the caller must
    * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
    * and get the first record.  Both macros return a NULL "inm" when there
    * are no remaining records.
    */
   #define IN_NEXT_MULTI(step, inm) \
           /* struct in_multistep  step; */ \
           /* struct in_multi *inm; */ \
   { \
           if (((inm) = (step).i_inm) != NULL) \
                   (step).i_inm = (inm)->inm_entry.le_next; \
           else \
                   while ((step).i_ia != NULL) { \
                           (inm) = (step).i_ia->ia_multiaddrs.lh_first; \
                           (step).i_ia = (step).i_ia->ia_next; \
                           if ((inm) != NULL) { \
                                   (step).i_inm = (inm)->inm_entry.le_next; \
                                   break; \
                           } \
                   } \
   }
   
   #define IN_FIRST_MULTI(step, inm) \
           /* struct in_multistep step; */ \
           /* struct in_multi *inm; */ \
   { \
           (step).i_ia = in_ifaddr; \
           (step).i_inm = NULL; \
           IN_NEXT_MULTI((step), (inm)); \
   }
   
   struct  in_multi *in_addmulti __P((struct in_addr *, struct ifnet *));
   void    in_delmulti __P((struct in_multi *));
   int     in_control __P((struct socket *, u_long, caddr_t, struct ifnet *));
   void    in_rtqdrain __P((void));
   void    ip_input __P((struct mbuf *));
   
   #endif /* KERNEL */
   
   #endif /* _NETINET_IN_VAR_H_ */

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