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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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We support ECMP routes only on Linux. Exported routes are checked in
krt_capable(), but a route generated during path merging avoids this
check.
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* Made structure with headlines,
* reordered,
* kicked out 'What is missing' part,
* Updated content by home page site and user docs
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An interface reconfiguration may change both the hello and update
intervals. An update interval change is immediately put into effect,
while a hello interval change is not. This also updates the hello
interval immediately (if the new interval is shorter than the old one),
and sends a hello to notify peers of the change.
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
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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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Thanks to Alexander Velkov for noticing it
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We do not need to maintain feasibility distances for our own router
ID (we ignore the updates anyway). Not doing so makes the routes be
garbage collected sooner when export filters change.
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
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When a route becomes infeasible it should not be kept as selected; this
is forbidden by section 3.6 of the RFC and prevents subsequent updates
from the same router ID from replacing it.
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
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This makes BIRD send a wildcard retraction on all interfaces before
shutting down and right after starting up. This helps ensure that
neighbours will discard the announced routes as soon as possible,
rather than only after the normal timeout procedures.
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
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An update with wildcard AE and infinite metric should be treated as a
global retraction of all prefixes announced by that neighbour, per
section 4.4.9 of the RFC. In addition, router ID and seqno in retraction
updates should be ignored. This reworks the handling of retractions and
adjusts the parser to handle all this correctly.
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
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This updates the documentation to correctly mention Babel when protocols
are listed, and adds examples and route attribute documentation to the
Babel section of the docs.
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
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Intervals are carried as 16-bit centisecond values, but kept internally
in 16-bit second values, which causes a potential for overflow. This adds
some checks to make sure this does not happen.
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
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Change attribute length limit to handle extended (64 kB) messages.
Do not mix updates and withdraws (RFC 7606).
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Logging is not yet initialized, we have to use fprintf() here.
Thanks to Pavel Tvrdik for noticing and debugging it.
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Although RFC 4271 does not forbid empty path segments, they are useless
and some implementations consider them invalid. It is clarified in RFC 7606,
specifying that AS_PATH with empty segment is considered malformed.
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This is necessary for proper detection of filter changes during
reconfigurations.
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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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==00:00:00:02.831 2468== Syscall param socketcall.setsockopt(optval) points to uninitialised byte(s)
==00:00:00:02.831 2468== at 0x513BDEA: setsockopt (in /usr/lib/libc-2.23.so)
==00:00:00:02.831 2468== by 0x45C7AF: sk_setup (io.c:1216)
==00:00:00:02.831 2468== by 0x45CDFF: sk_open (io.c:1417)
==00:00:00:02.831 2468== by 0x44B562: rip_open_socket (packets.c:740)
==00:00:00:02.831 2468== by 0x4481A7: rip_iface_locked (rip.c:616)
==00:00:00:02.831 2468== by 0x4133E4: olock_run_event (locks.c:177)
==00:00:00:02.831 2468== by 0x45A6DE: ev_run (event.c:85)
==00:00:00:02.831 2468== by 0x45A7AD: ev_run_list (event.c:142)
==00:00:00:02.831 2468== by 0x45E0FC: io_loop (io.c:2066)
==00:00:00:02.831 2468== by 0x463B56: main (main.c:845)
==00:00:00:02.831 2468== Address 0xffefffd24 is on thread 1's stack
==00:00:00:02.831 2468== in frame #1, created by sk_setup (io.c:1188)
==00:00:00:02.831 2468== Uninitialised value was created by a stack allocation
==00:00:00:02.831 2468== at 0x45C6BB: sk_setup (io.c:1188)
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This patch implements the IPv6 subset of the Babel routing protocol.
Based on the patch from Toke Hoiland-Jorgensen, with some heavy
modifications and bugfixes.
Thanks to Toke Hoiland-Jorgensen for the original patch.
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Add code for manipulation with TCP-MD5 keys in the IPsec SA/SP database
at FreeBSD systems. Now, BGP MD5 authentication (RFC 2385) keys are
handled automatically on both Linux and FreeBSD.
Based on patches from Pavel Tvrdik.
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When enabled, direct protocol generates routes only if the underlying
link state is up.
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Add option that changes default paths for config file and control socket
to the current working directory.
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Counter exp_routes is increased during initial route feed after GR
recovery, so it has to start with zero, otherwise BIRD will end with
double value in exp_routes.
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Event cycle may took too much time and trigger next timer events, so
avoid cycling between timer and event cycles inside the loop cycle.
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In BIRD, RX has lower priority than TX with the exception of RX from
control socket. The patch replaces heuristic based on socket type with
explicit mark and uses it for both control socket and BGP session waiting
to be established.
This should avoid an issue when during heavy load, outgoing connection
could connect (TX event), send open, but then failed to receive OPEN /
establish in time, not sending notifications between and therefore
got hold timer expired error from the neighbor immediately after it
finally established the connection.
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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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