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* ospfd: Refresher logic cleanup broke OSPF opaque, which does its own thing
with regard to refresher logic and which also, in the protocol, requires
implementations to keep state of which OI an LSA is received on (rather
than providing information in the LSA to allow it to be looked up - as
other LSAs requiring such assocation were careful to do).
* ospf_lsa.h: (struct ospf_interface) Add back the pointer to oi, but only
for type-9 now.
* ospf_nsm.c: (ospf_db_summary_add) check the oi actually exists first -
doesn't obviate the need for opaque to ensure oi pointers get cleaned up
when ospf_interfaces disappear.
* ospf_opaque.{c,h}: (ospf_opaque_functab,ospf_opaque_lsa_refresh) Refresher
LSA functions now need to return the LSA to the general refresh logic,
to indicate whether the LSA was refreshed.
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* ospf_lsa.h: (struct ospf_lsa) remove oi pointer
* ospf_lsa.c: (ospf_network_lsa_refresh) instead of keeping a pointer, just
lookup the oi when it's needed. This decouples network LSA from oi lifetime
and avoids having to invalidate pointers in LSAs when an oi changes,
simplifying the code.
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* ospf_lsa.c: (various) unregister LSAs from refresher before flushing.
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2006-05-30 Paul Jakma <paul.jakma@sun.com>
* (general) Fix confusion around MaxAge-ing and problem with
high-latency networks. Analysis and suggested fixes by
Phillip Spagnolo, in [quagga-dev 4132], on which this commit
expands slightly.
* ospf_flood.{c,h}: (ospf_lsa_flush) new function.
Scope-general form of existing flush functions, essentially
the dormant ospf_maxage_flood() but without the ambiguity of
whether it is responsible for flooding.
* ospf_lsa.c: (ospf_lsa_maxage) Role minimised to simply setup
LSA on the Maxage list and schedule removal - no more.
ospf_lsa_flush* being the primary way to kick-off flushes
of LSAs.
Don't hardcode the remover-timer value, which was too
short for very high-latency networks.
(ospf_maxage_lsa_remover) Just do what needs to be done to
remove maxage LSAs from the maxage list, remove the call
to ospf_flood_through().
Don't hardcode remove-timer value.
(ospf_lsa_{install,flush_schedule}) ospf_lsa_flush is the correct
entrypoint to flushing maxaged LSAs.
(lsa_header_set) Use a define for the initial age, useful for
testing.
* ospf_opaque.c: (ospf_opaque_lsa_refresh) ditto.
(ospf_opaque_lsa_flush_schedule) ditto.
* ospfd.h: ({struct ospf,ospf_new}) Add maxage_delay parameter,
interval to wait before running the maxage_remover. Supply a
suitable default.
Add a define for OSPF_LSA_INITIAL_AGE, see lsa_header_set().
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* (general) Get rid of the router and network LSA specific refresh timers
and make the general refresher do this instead. Get rid of the twiddling
of timers for router/network LSA that was spread across the code.
This lays the foundations for future, general LSA refresh improvements,
such as making sequence rollover work, and having generic LSA delays.
* ospfd.h: (struct ospf) Bye bye to the router-lsa update timer thread
pointer.
(struct ospf_area) and to the router-lsa refresh timer.
* ospf_interface.h: Remove the network_lsa_self timer thread pointer
* ospf_lsa.h: (struct ospf_lsa) oi field should always be there, for benefit
of type-2/network LSA processing.
(ospf_{router,network}_lsa_{update_timer,timer_add}) no timers for these
more
(ospf_{router,network}_lsa_update) more generic functions to indicate that some
router/network LSAs need updating
(ospf_router_lsa_update_area) update router lsa in a particular area alone.
(ospf_{summary,summary_asbr,network}_lsa_refresh) replaced by the general
ospf_lsa_refresh function.
(ospf_lsa_refresh) general LSA refresh function
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* ospf_interface.h: (struct ospf_if_params) add field for saved network LSA
seqnum
* ospf_interfa.c: (ospf_new_if_params) init network_lsa_seqnum field to
initial seqnum - doesnt matter though.
* ospf_lsa.c: (ospf_network_lsa_new) check for any saved sequence number,
and use if it exists. Save the result back. This should help avoid needless
round of LSUpdate/LSRequests when a neighbour has to tell the originator
"uhm, i have something newer than that already".
* ospf_vty.c: (show_ip_ospf_interface_sub) Show the saved network LSA seqnum
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* It's possible for the packet output buffer to be filled up with a long
series of non-Hello packets in between Hellos packets, such that the
router's neighbours don't receive the Hello packet in time, even though
the hello-timer ran at about the right time. Fix this by prioritising
Hello packets, letting them skip the queue and go ahead of any packets
already on the queue.
This problem can occur when there are lots of LSAs and slow links.
* ospf_packet.h: (ospf_hello_send_sub) not used outside of ospf_packet.c
* ospf_packet.c: (ospf_fifo_push_head) add packet to head of fifo (so its
no longer really a fifo, but hey)
(ospf_packet_add_top) add packet to top of the packet output queue.
(ospf_hello_send_sub) Put Hello's at the top of the packet output queue.
make it take in_addr_t parameter, so that this
ospf_hello_send can re-use this code too.
(ospf_hello_send) consolidate code by using ospf_hello_send_sub
(ospf_poll_send,ospf_hello_reply_timer) adjust for ospf_hello_send_sub.
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* The hello protocol monitors connectivity in 2 different ways:
a) local -> remote
b) remote -> local
Connectivity is required in both directions (2-way) for adjacencies to
form.
The first requires a round-trip to detect, and is done by advertising
which other hosts a router knows about in its hello messages. This allows
a host to detect which other routers are and are not receiving its
message. If a remote neighbour delists the local router, then the local
router raises a "1-Way Received" event.
The latter is straight-forward, and is detected by setting a timer for the
neighbour. If another Hello packet is not received within this time then
the neighbour is dead, and a separate "Inactive" event is raised.
These are 2 different and relatively independent measures.
Knowing that we can optimise the 2nd, remote->local measure and reset
the timer when /any/ packet arrives from that neighbour. For any packet
is as good as a Hello packet. This can help in marginal situations, where
the number of protocol messages that must be sent sometimes can exceed
the capacity of the network to transmit the messages within the configured
dead-time. I.e. an OSPF network with lots of LSAs, slow links and/or
slow hosts (e.g. O(10k) LSAs, O(100kbit) links, embedded CPUs, and O(10s)
dead-times).
This optimisation allows an OSPF network to run closer to this margin,
and/or allows networks to perhaps better cope with rare periods of
exceptional load, where otherwise they would not.
It's fully compatible with plain OSPF implementations and doesn't
prejudice dead-neighbour detection.
* ospf_nsm.h: Rename HelloReceived event to PacketReceived.
* ospf_nsm.c: (nsm_hello_received) -> nsm_packet_received
* ospf_packet.c: Schedule PacketReceived whenever a valid message is
received.
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* ospf_ase.c: (ospf_ase_calculate_route) Fix compiler warning about eval
needing brackets.
(various) add defensive asserts.
* ospf_lsdb.c: (ospf_lsdb_add) add missing node unlock if same lsa already
was indexed.
(ospf_lsdb_delete) check it's actually the same as specified lsa before
deleting
(ospf_lsdb_lookup_by_id_next) fix another corner case - no result =>
don't go on.
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* ospf_lsa.c: (ospf_lsa_refresh_walker) fix an "unlock before use" bug
(various) add asserts for lsa refcounting.
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* ospf_interface.c: (ospf_if_{new,cleanup}) don't touch the network_lsa_self,
ISM and NSM take care of cleaning it up if needs be + we want to keep
network_lsa_self around when possible for the the seqnum.
This shouldn't really make much difference though, particularly as we have
a separate sequence number memory mechanism.
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* ospf_packet.c: (ospf_ls_upd) the corresponding test on the arrival side
in (ospf_flood) is <, so this should be >=, not >, purely for consistency.
There is no practical effect here though.
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* ospf_interface.c: (ospf_if_free) events with dangling pointers left
scheduled can be seriously bad for ospfd's health. Cancel the event.
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* ospf_{ism,network}.c: Certain oft-repeated but trivial messages should be
debug log level, not info, to avoid spamming 'terminal monitor'
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* ospf_zebra.c: (ospf_distribute_list_update_timer) forces a
refresh of default route each time it finds a default prefix.
This is suboptimal, just record that it needs to be done and
do it once.
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
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* ospf_zebra.c: (ospf_distribute_list_update_timer)
If there are updates to the distribute list every 5 second or less,
ospf_distribute_list_update_timer() will never run as the timer gets
rearmed for each update. This fixes it by never rearming an active
distribute list timer.
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
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Roman Hoog Antink <rha@open.ch> reports:
When adding a connected route (using vtysh, without restart) to the
redistribution access list of ospfd, while static routes already exist,
the update timer ospf_distribute_list_update_timer() is being run for
static routes only. That way, the connected route never appears in the
OSPF database, until quagga is completely restarted.
The update timer for connected routes is cancelled in
ospfd/ospfd_zebra.c:ospf_distribute_list_update():976, were a new timer
is scheduled for static routes, caused by the loop in ospf_filter_update().
* ospf_zebra.c: (ospf_distribute_list_update_timer) make it
refresh all external routes. This fixes the problem
reported by Roman.
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
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* ospf_packet.c: (ospf_ls_upd) DISCARD_LSA continues, and so should be
after debug messages, not before them.
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* ospf_lsdb.c: (lsdb_prefix_set) memset is unneeded, as all fields are
initialised explicitly, and this function can be in the top-3 of a
profile when there are a lot of LSAs.
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Several bits of text can be local or are unused.
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This code is only used one place and can be made local.
Gcc is smart enough to inline local functions if it wants to.
The function also has a big chunk of compatiablity code that
is no longer used; since quagga is now in a version control system
the source does not need to be used as a historical reference.
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The following syntax forms were not historically supported
by Quagga, although IOS accepted them w/o a problem:
no ip ospf cost <1-65535>
no ospf cost <1-65535>
no ip ospf cost <1-65535> A.B.C.D
no ospf cost <1-65535> A.B.C.D
From now on Quagga also supports these variants.
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* ospf_ism.c (ospf_dr_eligible_routers) should test for priority > 0 instead
of != 0 as ospf_nbr_new () initially sets prio to -1
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* ospf_zebra.c: (ospf_distribute_check_connected) check to make filter out
routes matching connected routes was matching against OSPF networks, which
can be far more general than the actual connected interfaces. Fix.
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* */*main.c: (main) Current versions of Gcc warn if the return value for
daemon() is not checked. So add a simple test and exit on failure.
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Doing redistribute delete with full BGP table was taking
30 minutes, this drops it down to less than a second.
* ospf_lsa.c: (ospf_lsa_maxage) When flushing lots of entries the
performance is terrible because it looks up each LSA entry through
ospf_lsa_maxage_exist before deleting causing O(N^2) performance. Use a
new OSPF_LSA_MAXAGE flag instead of scan - and maintain it.
(ospf_lsa_maxage_exist) removed
(ospf_lsa_maxage_delete) maintain OSPF_LSA_MAXAGE flag
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In some cases ospfd does not recalc the route table. This
happens when ospfd receives an old LSA which will trigger
recalc but the this recalc will fail because all interfaces
isn't up yet. Next LSA that is originated matches the old one
so no recalc will be performed. This problem has been observed
when there are only 2 ppp I/Fs in an area, both go down at the
same time, then they come up again with a few seconds apart.
* ospf_lsa.c: (ospf_{router,network}_lsa_install) avoid a needless scheduling
of SPF.
(ospf_lsa_different) fix bug in LSA comparison that would lead to the
described failure to schedule SPF.
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* ospf_packet.c: make this message conditional on 'debug ospf event', as it
be easily triggered with, e.g., multiple subnets sharing same physical
network. E.g, see bug #532.
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* ospf_lsa.c: (link_info_set) Use %zd for size_t - C99 is old enough now.
Lots of similar warnings all over the code.
(ospf_lsa_translated_nssa_compare) Unused func - delete.
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* ospf_{spf,lsa}.c: remove out of date comment; add comment on some
non-obvious code; Make note of a possible scaling problem.
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* global: In struct ospf_path, change struct ospf_interface *oi to int
ifindex. It is unsafe to reference *oi as an ospf interface can be
deleted under your feet. Use a weak reference instead.
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* ospf_spf.c: (ospf_get_next_link) One must check the vertex type, Router or
Network, to select type link to match against. Link type 1 has neighbour
router ID in link_id and link type 2 has IP address of DR. Since router
id may have same value as an existing IP address one risks matching a
router ID against a DR.
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This function will return the interface for the first matching
remote address for PtP i/f's. That won't work for multiple
unnumbered i/f's as these may all have the same address.
Pass in the struct interface pointer, ifp, to find the
correct set of oi's to search in. This also reduces the
size of the search list, making it faster.
* ospfd/ospf_interface.c: Add struct interface * param to
ospf_if_lookup_recv_if() to select the right list to search in.
* ospfd/ospf_interface.h: ditto.
* ospfd/ospf_packet.c: Pass new ifp argument to ospf_if_lookup_recv_if()
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Makes it possible to run OSPF on multiple PtP interfaces
with the same remote address.
* ospfd/ospf_interface.c: Export ospf_if_table_lookup().
* ospfd/ospf_interface.h: ditto.
* ospfd/ospfd.c: (ospf_network_run_interface) Use ospf_if_table_lookup() to
determine whether OSPF is already configured for a subnet and interface.
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*/*: ifp->flags is 64 bit unsigned which can not be handled by %l on 32
bit architectures - requires %ll and the appropriate cast.
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Should a self originated Network/Router LSA with higher
LS seq. nr. be received we should flood and install it in
the LSDB but we cannot use it for our internal calculations
as it is stale.
Reorginate an new LSA to replace the stale one as soon
as possible.
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ospf_path_lookup(), ospf_route_match_same() and
ospf_ase_route_match_same() needs to
compare if the interface matches too.
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A few route_unlock_node() calls was missing.
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ospf_lsa_install() will calculate LSA checksum so no
need to do it before calling ospf_lsa_install().
Set the OSPF_LSA_SELF_CHECKED flag on own LSA's to
save ospf_lsa_is_self_originated() some work.
Do not memset() memory that is about to overwritten
with memcpy().
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This piece of code causes all Quagga routers on a broadcast link to
send a HELLO packet simultaneously if they see a new neighbor. It also
resets the HELLO timer, so all the quagga routers will continue to
send HELLO packets simultaneously in the future. This is not good
(especially on networks with a lot of Quagga routers connected), and
is explicitly discouraged by the OSPF standard, RFC 2328 (chapter
4.4.Timers).
I suggest to remove the code snippet, it does not provide much benefit
anyway.
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Should probably have AC_TYPE_UINT16_T in configure.ac to make it really
clean... and a fresh import of gnulib, the existing copy of gnulib seems to
be manually put some stuff in zebra.h. I'm leaving that alone for now,
since a fresh import will probably clean up a lot of cruft and it would be a
duplicated effort to fix some things now.
The FreeBSD port 0.99.11_1 files/patch-ospfd-ospfd.h can probably go away
after this is applied.
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* */*main.c: Seems that the actual code was removed previously, but the
argument processing code remained.
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This may fix vyatta BUG 3096. The reference count for OSPF route table was
never completely freed on deleting all neighbors.
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The cmd_nodes used to configure vty, can mostly be static so
(basic data hiding 101).
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