usr/src/sys/netinet/in_var.h

/*
 * Copyright (c) 1985, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)in_var.h    7.8 (Berkeley) %G%
 */

/*
 * 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 */
        struct  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 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 */
void    in_socktrim __P((struct sockaddr_in *));


/*
 * 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_SIN(ia)->sin_addr.s_addr != (addr).s_addr; \
            ia = ia->ia_next) \
                 continue; \
        (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

/*
 * 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 {
        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 */
        struct  in_multi *inm_next;     /* ptr to next multicast address */
};

#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; \
                    (inm) != NULL && (inm)->inm_addr.s_addr != (addr).s_addr; \
                     (inm) = inm->inm_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_next; \
        else \
                while ((step).i_ia != NULL) { \
                        (inm) = (step).i_ia->ia_multiaddrs; \
                        (step).i_ia = (step).i_ia->ia_next; \
                        if ((inm) != NULL) { \
                                (step).i_inm = (inm)->inm_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 *));
int     in_delmulti __P((struct in_multi *));
#endif