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Also fixes a potential problem with link-local dest_addrs
for IA_PEER addresses.

Thanks to Alexander V. Chernikov for the suggestion.

Multiple IPs in the same IP prefix confuse the direct
protocol and could cause withdrawal of a valid prefix.

Thanks to Dan Rimal for a bugreport.

The bug caused that krt_prefsrc attribute was not processed when a route
received from a kernel protocol was exported to another kernel protocol.

Thanks to Sergey Popovich for a bugreport.

When global set variables were used, every reconfiguration restarted
protocols that use it in filters.

Thanks to Sergey Popovich for a bugreport.

Thanks to Alexander V. Chernikov for the patch.

Neighbor events related to received route next hops got mixed up with
sticky neighbor node for an IP of the BGP peer. If a neighbor for a next
hop disappears, BGP session is shut down.

Thanks to Sergey Popovich for the bugreport.

Also contains minor fixes in doc formatting.

Thanks to Javor Kliachev for the bugreport.

Implemented eval command can be used to evaluate expressions.

The patch also documents echo command and allows to use log classes
instead of integer as a mask for echo.

Thanks to Fritz Grimpen for the patch.

When route was propagated to another rtable through a pipe and then the
pipe was reconfigured softly in such a way that any subsequent route
updates are filtered, then the source protocol shutdown didn't clean up
the route in the second rtable which caused stale routes and potential
crashes.

If TX buffers were full during BGP session shutdown
then a protocol waited indefinitely to be able to
send notification packet to close the session.

Inspired by the patch from Alexander V. Chernikov.

Interfaces for OSPF and RIP could be configured to use (and request)
TTL 255 for traffic to direct neighbors.

Thanks to Simon Dickhoven for the original patch for RIPng.

Implements support for IPv6 traffic class, sets higher priority for OSPF
and RIP outgoing packets by default and allows to configure ToS/DS/TClass
IP header field and the local priority of outgoing packets.

Temporary dummy routes created by a kernel protocol during routing table
scan get mixed with real routes propagated from another kernel protocol
through a pipe.

Also fixes OSPFv3 routing table calculcation w.r.t.
errata 2078 to RFC 5340.

Negative bit shifts are definitely undefined oprations.