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xorp
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specialized BGPRouteTable implementing a filter bank to modify or drop routes. More...
#include <route_table_filter.hh>
Public Member Functions | |
| FilterTable (string tablename, Safi safi, BGPRouteTable< A > *parent, NextHopResolver< A > &next_hop_resolver) | |
| void | reconfigure_filter () |
| int | add_route (InternalMessage< A > &rtmsg, BGPRouteTable< A > *caller) |
| int | replace_route (InternalMessage< A > &old_rtmsg, InternalMessage< A > &new_rtmsg, BGPRouteTable< A > *caller) |
| int | delete_route (InternalMessage< A > &rtmsg, BGPRouteTable< A > *caller) |
| int | route_dump (InternalMessage< A > &rtmsg, BGPRouteTable< A > *caller, const PeerHandler *dump_peer) |
| int | push (BGPRouteTable< A > *caller) |
| const SubnetRoute< A > * | lookup_route (const IPNet< A > &net, uint32_t &genid, FPAListRef &pa_list) const |
| void | route_used (const SubnetRoute< A > *route, bool in_use) |
| RouteTableType | type () const |
| string | str () const |
| bool | get_next_message (BGPRouteTable< A > *next_table) |
| int | add_aggregation_filter (bool is_ibgp) |
| int | add_simple_AS_filter (const AsNum &asn) |
| int | add_route_reflector_input_filter (IPv4 bgp_id, IPv4 cluster_id) |
| int | add_AS_prepend_filter (const AsNum &asn, bool is_confederation_peer) |
| int | add_nexthop_rewrite_filter (const A &nexthop, bool directly_connected, const IPNet< A > &subnet) |
| int | add_nexthop_peer_check_filter (const A &nexthop, const A &peer_address) |
| int | add_ibgp_loop_filter () |
| int | add_route_reflector_ibgp_loop_filter (bool client, IPv4 bgp_id, IPv4 cluster_id) |
| int | add_route_reflector_purge_filter () |
| int | add_localpref_insertion_filter (uint32_t default_local_pref) |
| int | add_localpref_removal_filter () |
| int | add_med_insertion_filter () |
| int | add_med_removal_filter () |
| int | add_known_community_filter (PeerType peer_type) |
| int | add_unknown_filter () |
| int | add_originate_route_filter (const AsNum &asn, PeerType peer_type) |
| void | do_versioning () |
Private Member Functions | |
| bool | apply_filters (InternalMessage< A > &rtmsg, int ref_change) |
| bool | apply_filters (InternalMessage< A > &rtmsg) const |
| void | drop_message (const InternalMessage< A > *rtmsg) const |
Private Attributes | |
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map< uint32_t, FilterVersion < A > * > | _filter_versions |
| set< uint32_t > | _deleted_filters |
| FilterVersion< A > * | _current_filter |
| NextHopResolver< A > & | _next_hop_resolver |
| bool | _do_versioning |
specialized BGPRouteTable implementing a filter bank to modify or drop routes.
The XORP BGP is internally implemented as a set of pipelines consisting of a series of BGPRouteTables. Each pipeline receives routes from a BGP peer, stores them, and applies filters to them to modify the routes. Then the pipelines converge on a single decision process, which decides which route wins amongst possible alternative routes. After decision, the winning routes fanout again along a set of pipelines, again being filtered, before being transmitted to peers.
FilterTable is a BGPRouteTable that can hold banks of route filters. Normally FilterTable propagates add_route, delete_route and the response to lookup_route directly through from the parent to the child. A route filter can cause these to not be be propagated, or can modify the attributes of the route in the message.
Typically there are two FilterTables for each peer, one in the input branch from that peer, and one in the output branch to that peer. A FilterTable does not store the routes it modifies. Thus is is normally followed by a CacheTable which stores those routes for later use.
1.7.3 
