class NextHopRibRequest Make requests of the RIB and get responses. More... Definition #include <next_hop_resolver.hh> Template form NextHopRibRequest<class A> List of all Methods

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Public Methods

•  NextHopRibRequest (XrlStdRouter *, NextHopResolver<A>& next_hop_resolver, NextHopCache<A>& next_hop_cache, BGPMain& bgp)
•  ~NextHopRibRequest ()
• bool  register_ribname (const string& r)
• void  register_nexthop (A nexthop, IPNet<A> net, NhLookupTable<A> *requester)
• void  send_next_request ()
• void  register_interest (A nexthop)
• void  register_interest_response (const XrlError& error, const bool *resolves, const A *addr, const uint32_t *prefix_len, const uint32_t *real_prefix_len, const A *actual_nexthop, const uint32_t *metric, const A nexthop_interest, const string comment)
• bool  deregister_nexthop (A nexthop, IPNet<A> net, NhLookupTable<A> *requester)
• void  reregister_nexthop (A nexthop, uint32_t ref_cnt, bool resolvable, uint32_t metric)
• bool  lookup (const A& nexthop, bool& resolvable, uint32_t& metric) const
• void  deregister_from_rib (const A& nexthop, uint32_t prefix_len)
• void  deregister_interest (A nexthop, uint32_t prefix_len)
• void  deregister_interest_response (const XrlError& error, A addr, uint32_t prefix_len, string comment)
• bool  status (string& reason) const

Detailed Description

Make requests of the RIB and get responses.

At any time there is only ever one outstanding request to the RIB. Firstly we don't want to overrun the RIB with requests. Secondly it is possible that different next hops in the queue of requests may resolve to the same address/prefix_len answer (see below).

Register interest with the RIB about this next hop.

Parameters:

nexthop	The next hop that we are attempting to resolve.
net	The subnet that this next hop is associated with.
requester	The lookup table that wants to be notified when the response comes back.

Send the next queued request

Actually register interest with the RIB.

A small method that will be specialized to differentiate between IPv4 and IPv6.

Parameters:

nexthop

The next hop that we are attempting to resolve.

XRL callback from register_interest.

Deregister interest with the RIB about this next hop.

Parameters:

nexthop	The next hop that we are attempting to resolve.
net	The subnet that this next hop is associated with.
requester	The lookup table that wants to be notified when the response comes back.

Returns: True if an entry was found to remove.

Reregister interest with the RIB about this next hop.

This method is used when the RIB tells us that all previous registrations have become invalid. This forces us to re-request information. We save the old state (resolvable, metric) just in case the following events occur:

 1) Register from next hop table.
 2) route_info_invalid from RIB.
 3) lookup from decision.

This ordering of events may not be possible just in case it is save the old result and return it in a lookup.

Parameters:

nexthop	The next hop that we are attempting to resolve.
ref_cnt	The number of subnets using this nexthop.
resolvable	Was the previous result resolvable.
metric	If the previous result was resolvable the metric.

[const]

lookup next hop.

Parameters:

nexthop	Next hop.
resolvable	Is this route resolvable.
metric	If this route is resolvable the metric of this route.

Returns: True if this next hop is found.

XRL response method.

Parameters:

error	Error returned by xrl call.
comment	Comment string used for diagnostic purposes.

[const]

Get the status of the NextHopRibRequest

Parameters:

reason

the human-readable reason for any failure

Returns: false if NextHopRibRequest has suffered a fatal error, true otherwise