usr/src/sys/netiso/tuba_table.h

/*-
 * Copyright (c) 1992 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)tuba_table.h        7.4 (Berkeley) %G%
 */

struct tuba_cache {
        struct  radix_node tc_nodes[2];         /* convenient lookup */
        int     tc_refcnt;
        int     tc_time;                        /* last looked up */
        int     tc_flags;
#define TCF_PERM        1
        int     tc_index;
        u_short tc_sum_in;                      /* for inbound cksum */
        u_short tc_sum_out;                     /* for outbound cksum */
        struct  iso_addr tc_addr;
};

#define ADDCARRY(x)  (x >= 65535 ? x -= 65535 : x)
#define REDUCE(a, b) { union { u_short s[2]; long l;} l_util; long x; \
        l_util.l = (b); x = l_util.s[0] + l_util.s[1]; ADDCARRY(x); a = x;}

#ifdef KERNEL
extern int      tuba_table_size;
extern struct   tuba_cache **tuba_table;
extern struct   radix_node_head *tuba_tree;
#endif