Annotation of embedaddon/mrouted/route.h, revision 1.1
1.1 ! misho 1: /*
! 2: * The mrouted program is covered by the license in the accompanying file
! 3: * named "LICENSE". Use of the mrouted program represents acceptance of
! 4: * the terms and conditions listed in that file.
! 5: *
! 6: * The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
! 7: * Leland Stanford Junior University.
! 8: */
! 9:
! 10: /*
! 11: * Routing Table Entry, one per subnet from which a multicast could originate.
! 12: * (Note: all addresses, subnet numbers and masks are kept in NETWORK order.)
! 13: *
! 14: * The Routing Table is stored as a doubly-linked list of these structures,
! 15: * ordered by decreasing value of rt_originmask and, secondarily, by
! 16: * decreasing value of rt_origin within each rt_originmask value.
! 17: * This data structure is efficient for generating route reports, whether
! 18: * full or partial, for processing received full reports, for clearing the
! 19: * CHANGED flags, and for periodically advancing the timers in all routes.
! 20: * It is not so efficient for updating a small number of routes in response
! 21: * to a partial report. In a stable topology, the latter are rare; if they
! 22: * turn out to be costing a lot, we can add an auxiliary hash table for
! 23: * faster access to arbitrary route entries.
! 24: */
! 25: struct rtentry {
! 26: struct rtentry *rt_next; /* link to next entry MUST BE FIRST */
! 27: u_int32 rt_origin; /* subnet origin of multicasts */
! 28: u_int32 rt_originmask; /* subnet mask for origin */
! 29: short rt_originwidth; /* # bytes of origin subnet number */
! 30: u_char rt_metric; /* cost of route back to origin */
! 31: u_char rt_flags; /* RTF_ flags defined below */
! 32: u_int32 rt_gateway; /* first-hop gateway back to origin */
! 33: vifi_t rt_parent; /* incoming vif (ie towards origin) */
! 34: vifbitmap_t rt_children; /* outgoing children vifs */
! 35: u_int32 *rt_dominants; /* per vif dominant gateways */
! 36: nbrbitmap_t rt_subordinates; /* bitmap of subordinate gateways */
! 37: nbrbitmap_t rt_subordadv; /* recently advertised subordinates */
! 38: u_int rt_timer; /* for timing out the route entry */
! 39: struct rtentry *rt_prev; /* link to previous entry */
! 40: struct gtable *rt_groups; /* link to active groups */
! 41: };
! 42:
! 43: #define RTF_CHANGED 0x01 /* route changed but not reported */
! 44: #define RTF_HOLDDOWN 0x04 /* this route is in holddown */
! 45:
! 46: #define ALL_ROUTES 0 /* possible arguments to report() */
! 47: #define CHANGED_ROUTES 1 /* and report_to_all_neighbors() */
! 48:
! 49: #define RT_FMT(r, s) inet_fmts((r)->rt_origin, (r)->rt_originmask, s, sizeof(s))
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>