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Kernel routes with different metrics do not clash with each other,
therefore using dedicated metric value is a reliable way to avoid
overwriting routes from other sources (e.g. kernel device routes).
Although kernel route metric could already be set as a route attribute by
filters, that is not consistent with the way how Linux kernel handles
route metric - not just a route attribute, but a part of a route key.
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Linux represents IPv6 ECMP routes as a sequence of unipath routes with
the same prefix. We have to translate between our representation (one
route with multipath next hop) and the Linux representation in both
directions.
Proper learning of alien IPv6 ECMP routes still not supported.
Thanks to Mikhail Sennikovskii for the original patch.
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Ignore tentative IPv6 addresses and wait until finish of Duplicate
Address Detection (We got notification when an address is no longer
tentative) to avoid problems when protocols try to use interfaces
with tentative link-local addresses.
Based on patch from Jan Moskyto Matejka
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The netlink code assumes an order for the members of struct msghdr.
This breaks recvmsg and sendmsg with musl libc on mips64. Fix this by
using designated initializers instead.
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
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When a kernel route changed, function krt_learn_scan() noticed that and
replaced the route in internal kernel FIB, but after that, function
krt_learn_prune() failed to propagate the new route to the nest, because
it confused the new route with the (removed) old best route and decided
that the best route did not changed.
Wow, the original code (and the bug) is almost 17 years old.
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Wanted netlink attributes are defined in a table, specifying
their size and neediness. Removing the long conditions that did the
validation before.
Also parsing IPv4 and IPv6 versions regardless on the IPV6 macro.
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If an interface address notification is received during device protocol
shutdown/restart, BIRD crashed.
Thanks to Wei Huang for the bugreport.
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Since 2.6.19, the netlink API defines RTA_TABLE routing attribute to
allow 32-bit routing table IDs. Using this attribute to index routing
tables at Linux, instead of 8-bit rtm_table field.
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Thanks to Pavel Tvrdik for the bugfix
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Linux kernel route metrics (RTA_METRICS netlink route attribute) are
represented and accessible as new route attributes:
krt_mtu, krt_window, krt_rtt, krt_rttvar, krt_sstresh, krt_cwnd, krt_advmss,
krt_reordering, krt_hoplimit, krt_initcwnd, krt_rto_min, krt_initrwnd,
krt_quickack, krt_lock_mtu, krt_lock_window, krt_lock_rtt, krt_lock_rttvar,
krt_lock_sstresh, krt_lock_cwnd, krt_lock_advmss, krt_lock_reordering,
krt_lock_hoplimit, krt_lock_rto_min, krt_feature_ecn, krt_feature_allfrag
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Unfortunately, some interfaces support multicast but do not have
this flag set, so we use it only as a positive hint.
Thanks to Clint Armstrong for noticing the problem.
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This value is specified in documentation.
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Thanks to Pierluigi Rolando and others for the bugreport.
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Thanks to Benjamin Cama for notification.
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Conflicts:
filter/filter.c
nest/proto.c
nest/rt-table.c
proto/bgp/bgp.h
proto/bgp/config.Y
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And some minor fixes.
Thanks to Sergey Popovich for the patch.
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Negative bit shifts are definitely undefined oprations.
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Allows to send and receive multiple routes for one network by one BGP
session. Also contains necessary core changes to support this (routing
tables accepting several routes for one network from one protocol).
It needs some more cleanup before merging to the master branch.
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Adding some files that was accidentally removed
(instead of moved) in cleanup part 2.
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