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Convert the list_delete(struct list *) function to use
struct list **. This is to allow the list pointer to be nulled.
I keep running into uses of this list_delete function where we
forget to set the returned pointer to NULL and attempt to use
it and then experience a crash, usually after the developer
has long since left the building.
Let's make the api explicit in it setting the list pointer
to null.
Cynical Prediction: This code will expose a attempt
to use the NULL'ed list pointer in some obscure bit
of code.
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
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Remove instances of ospf master's iflist and use vrf_list
with ospf vrf_id.
Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>
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Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>
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Call apply_mask() where route_node_get() is performed,
for the prefix to fetch correct node.
Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>
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This allows modules to register their own additional hooks on interface
creation/deletion.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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This reverts commit c14777c6bfd0a446c85243d3a9835054a259c276.
clang 5 is not widely available enough for people to indent with. This
is particularly problematic when rebasing/adjusting branches.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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w/ clang 5
* reflow comments
* struct members go 1 per line
* binpack algo was adjusted
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indent.py `git ls-files | pcregrep '\.[ch]$' | pcregrep -v '^(ldpd|babeld|nhrpd)/'`
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Need a comment on these.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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added comment around which bw value used.
Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>
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Handle proper indent and insert missing not statement.
Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>
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if bandwidth is not set from Zebra use speed as bandwidth
for ospf route.
Testing Done:
Verfied over bond which has aggregated speed of all member interfaces,
cost is reflected in ospf route and ip route.
Manually changed interface bandwidth which replaces speed as bw, instead
uses cli entered value as bw, verifid output of ospf route and ip route.
Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>
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If the user enters a decimal, display a decimal.
If the user enters a dotted quad, display a dotted quad.
Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
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The FSF's address changed, and we had a mixture of comment styles for
the GPL file header. (The style with * at the beginning won out with
580 to 141 in existing files.)
Note: I've intentionally left intact other "variations" of the copyright
header, e.g. whether it says "Zebra", "Quagga", "FRR", or nothing.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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ospf_if_is_configured is never used, remove.
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
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This means there are no ties into the SNMP code anymore other than the
init call at startup.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
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Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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This reverts commit b7fe4141, which introduced a logic where the OSPF
send buffer size was dynamically updated to reflect the maximum MTU
of the OSPF enabled interfaces (this was done to make ospfd work with
interfaces configured for jumbo frames).
Since commit a78d75b0, this is not necessary anymore because
ospf_sock_init() now sets the OSPF send buffer size to a very high value
(8MB). Also, the previous logic was broken because it didn't account
for run-time interface MTU changes.
Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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HAVE_OPAQUE_LSA is used by default and you have to actively turn it off
except that OPAQUE_LSA is an industry standard and used pretty much
everywhere. There is no need to have special #defines for this anymore.
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
(cherry picked from commit 36fef5708d074a3ef41f34d324c309c45bae119b)
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Upon router-id change, one object that needs to be updated is the "nbr_self"
structure that is created to contain information about the local router and
is used during DR election, among other things. In the past, the code used to
just change the router-id field of this structure. This is actually not
sufficient - the neighbor has to be deleted and re-added into the tree. This
was fixed upstream and the fix is now available in our tree, but those changes
don't work well with prior Cumulus changes to defer updating the router-id
in the OSPF instance until other cleanup has happened.
Fixed code to update the "nbr_self" structure correctly while continuing to
defer the router_id update in the OSPF structure.
Signed-off-by: Vivek Venkatraman <vivek@cumulusnetworks.com>
Reviewed-by: Donald Sharp <sharpd@cumulusnetworks.com>
Ticket: CM-11861
Reviewed By: CCR-4980
Testing Done: Manual, failed test
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ospfd keeps a list of neighbor routers for each configured interface. This
list is indexed using the neighbor router id in case of point-to-point and
virtual link types, otherwise the list is indexed using the neighbor's
source IP (RFC 2328, page 96). The router adds itself as a "pseudo" neighbor
on each link, and also keeps a pointer called (nbr_self) to the neighbor
structure. This takes place when the interface is first configured. Currently
ospfd adds this pseudo neighbor before the link parameters are fully configure,
including whether the link type is point-to-point or virtual link. This causes
the pseudo neighbor to be always indexed using the source IP address regardless
of th link type. For point-to-point and virtual links, this causes the lookup
for the pseudo neighbor to always fail because the lookup is done using the
router id whereas the neighbor was added using its source IP address.
This becomes really problematic if there is a state change that requires a
rebuild of nbr_self, changing the router id for example. When resetting
nbr_self, the router first tries to remove the pseudo neighbor form its
neighbor list on each link by looking it up and resetting any references to it
before freeing the neighbor structure. since the lookup fails to retrieve any
references in the case of point-to-point and virtual links the neighbor
structure is freed leaving dangling references to it. Any access to the
neighbor list after that is bound to stumble over this dangling pointer
causing ospfd to crash.
Signed-off-by: Jafar Al-Gharaibeh <jafar@atcorp.com>
Tested-by: NetDEF CI System <cisystem@netdef.org>
(cherry picked from commit bb01bdd740339b0c07d8ed0786811801b2a79192)
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* 94266fa822ba "ospfd: Self nbrs needs to be rebuilt when router ID changes."
deleted the nbr_self, and added it back, but ospf_nbr_add_self doesn't
actually create the nbr_self - it assumes it's already there. Leading
to use after free and crashes after a router-id change.
* ospfd/ospf_neighbor.{c,h}: (ospf_nbr_self_reset) Little helper to reset the
nbr_self correctly.
* ospf_interface.c: (ospf_if_cleanup) moved code to ospf_nbr_self_reset
* ospfd.c: (ospf_router_id_update) Use ospf_nbr_self_reset instead of doing
the reset badly, fixing 94266fa822ba.
(cherry picked from commit c920e510d09c6c4ab63a3da5375009442a950f82)
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The file if.c has a iflist that had the list of interfaces
in the default vrf. Remove this variable and replace
with a vrf_iflist lookup on the default vrf where it
was used.
Additionally, modify ptm code to iterate over all vrf's
when enabling ptm.
Ticket: CM-10338
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Reviewed-by: Don Slice <dslice@cumulusnetworks.com>
Reviewed-by: Radhika Mahankali <radhika@cumulusnetworks.com>
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Later, an interface will belong to a specific VRF, and the interface
initialization will be a part of the VRF initialization. So now call
if_init() from vrf_init(), and if_terminate() from vrf_terminate().
Daemons have the according changes:
- if if_init() was called or "iflist" was initialized, now call
vrf_init() instead;
- if if_terminate() was called or "iflist" was destroyed, now call
vrf_terminate() instead.
Signed-off-by: Feng Lu <lu.feng@6wind.com>
Reviewed-by: Alain Ritoux <alain.ritoux@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Vincent JARDIN <vincent.jardin@6wind.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
Conflicts:
bgpd/bgp_main.c
pimd/pim_iface.c
pimd/pim_iface.h
pimd/pim_main.c
pimd/pimd.c
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Ticket: Trivial
Reviewed by: Trivial
Testing: arm/powerpc/amd64 targets now build
Apparently we have a arm build. Who knew? This fixes the compile warnings/errors
produced when you compile a arm build with -Werror.
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Ticket: Trivial
Reviewed by: Trivial
Testing: Compilation
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interactive mode of dynamically registering/deregistering neighbors discovered on BFD enabled interfaces with PTM/BFD through zebra. Neighbor is registered with BFD when 2-way adjacency is established and deregistered when adjacency goes down if the BFD is enabled on the interface through which the neighbor was discovered.
OSPF BFD command enhancement to configure BFD parameters (detect multiplier, min rx and min tx).
interface <if-name>
ip ospf bfd <detect mult> <min rx> <min tx>
This patch also adds BFD support for IPv6 OSPF. ospf6d will dynamically register/deregister IPv6 neighbors with BFD for monitoring the connectivity of the neighbor. Neighbor is registered with BFD when 2-way adjacency is established and deregistered when adjacency goes down if the BFD is enabled on the interface through which the neighbor was discovered.
OSPF6 BFD command added to configure BFD and parameters (detect multiplier, min rx and min tx).
interface <if-name>
ipv6 ospf6 bfd <detect mult> <min rx> <min tx>
Signed-off-by: Radhika Mahankali <radhika@cumulusnetworks.com>
Reviewed-by: Donald Sharp <sharpd@cumulusnetworks.com>
Reviewed-by: Kanna Rajagopal <kanna@cumulusnetworks.com>
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ospfd: virtual links fix
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Reviewed-by:
Basically ZEBRA_INTERFACE_LINKDETECTION is set to on by default now.
Virtual links are failing to identify as up because of this code change.
Modify ospf to set the flag as appropriate
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Quagga sources have inherited a slew of Page Feed (^L, \xC) characters
from ancient history. Among other things, these break patchwork's
XML-RPC API because \xC is not a valid character in XML documents.
Nuke them from high orbit.
Patches can be adapted simply by:
sed -e 's%^L%%' -i filename.patch
(you can type page feeds in some environments with Ctrl-V Ctrl-L)
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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Maintain router LSA positions in OSPF interface.
Find the OSPF interface in nexthop_calculation using
the position in the router LSA. This is possible because
the only time nexthop_calculation needs to look up interfaces
is when dealing with its own Router LSA.
This has the following advantages:
- Multiple PtP interfaces with the same IP address between two routers.
- Use Unnumbered PtP on just one end of the link.
- Faster OI lookup for the OSPF interface and only
done once for PtoP links.
*ospf_interface.h: (struct ospf_interface) Add storage for
storing router LSA position.
*ospf_interface.c: (ospf_if_lookup_by_lsa_pos)
lookup OSPF I/F in an area using LSA position.
*ospf_lsa.c: (router_lsa_link_set) record Router LSA position.
*ospf_spf.c: (ospf_spf_next) Count and pass along lsa position.
(ospf_nexthop_calculation) Add lsa position argument.
call ospf_if_lookup_by_lsa_pos() for OSFP interface handle.
Clean up and remove all calls ospf_if_is_configured() the
rest. Adjust a few debug logs.
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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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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* 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_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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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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Simple conversion of XMALLOC/memset to XCALLOC
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2007-04-21 Andrew J. Schorr <ajschorr@alumni.princeton.edu>
* ospf_interface.c: (ospf_if_set_multicast) Fix bug: was testing
interface passive status improperly in light of the recent
'passive-interface default' patch. Now need to test
OSPF_IF_PASSIVE_STATUS(oi) instead of
OSPF_IF_PARAM(oi, passive_interface).
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2006-12-12 Andrew J. Schorr <ajschorr@alumni.princeton.edu>
* if.h: (struct connected) Add new ZEBRA_IFA_PEER flag indicating
whether a peer address has been configured. Comment now shows
the new interpretation of the destination addr: if ZEBRA_IFA_PEER
is set, then it must contain the destination address, otherwise
it may contain the broadcast address or be NULL.
(CONNECTED_DEST_HOST,CONNECTED_POINTOPOINT_HOST) Remove obsolete
macros that were specific to IPv4 and not fully general.
(CONNECTED_PEER) New macro to check ZEBRA_IFA_PEER flag.
(CONNECTED_PREFIX) New macro giving the prefix to insert into
the RIB: if CONNECTED_PEER, then use the destination (peer) address,
else use the address field.
(CONNECTED_ID) New macro to come up with an identifying address
for the struct connected.
* if.c: (if_lookup_address, connected_lookup_address) Streamline
logic with new CONNECTED_PREFIX macro.
* prefix.h: (PREFIX_COPY_IPV4, PREFIX_COPY_IPV6) New macros
for better performance than the general prefix_copy function.
* zclient.c: (zebra_interface_address_read) For non-null destination
addresses, set prefixlen to equal the address prefixlen. This
is needed to get the new CONNECTED_PREFIX macro to work properly.
* connected.c: (connected_up_ipv4, connected_down_ipv4,
connected_up_ipv6, connected_down_ipv6) Simplify logic using the
new CONNECTED_PREFIX macro.
(connected_add_ipv4) Set prefixlen in destination addresses (required
by the CONNECTED_PREFIX macro). Use CONNECTED_PEER macro instead
of testing for IFF_POINTOPOINT. Delete invalid warning message.
Warn about cases where the ZEBRA_IFA_PEER is set but no
destination address has been supplied (and turn off the flag).
(connected_add_ipv6) Add new flags argument so callers may set
the ZEBRA_IFA_PEER flag. If peer/broadcast address satisfies
IN6_IS_ADDR_UNSPECIFIED, then reject it with a warning.
Set prefixlen in destination address so CONNECTED_PREFIX will work.
* connected.h: (connected_add_ipv6) Add new flags argument so
callers may set the ZEBRA_IFA_PEER flag.
* interface.c: (connected_dump_vty) Use CONNECTED_PEER macro
to decide whether the destination address is a peer or broadcast
address (instead of checking IFF_BROADCAST and IFF_POINTOPOINT).
* if_ioctl.c: (if_getaddrs) Instead of setting a peer address
only when the IFF_POINTOPOINT is set, we now accept a peer
address whenever it is available and not the same as the local
address. Otherwise (no peer address assigned), we check
for a broadcast address (regardless of the IFF_BROADCAST flag).
And must now pass a flags value of ZEBRA_IFA_PEER to
connected_add_ipv4 when a peer address is assigned.
The same new logic is used with the IPv6 code as well (and we
pass the new flags argument to connected_add_ipv6).
(if_get_addr) Do not bother to check IFF_POINTOPOINT: just
issue the SIOCGIFDSTADDR ioctl and see if we get back
a peer address not matching the local address (and set
the ZEBRA_IFA_PEER in that case). If there's no peer address,
try to grab SIOCGIFBRDADDR regardless of whether IFF_BROADCAST is set.
* if_ioctl_solaris.c: (if_get_addr) Just try the SIOCGLIFDSTADDR ioctl
without bothering to check the IFF_POINTOPOINT flag. And if
no peer address was found, just try the SIOCGLIFBRDADDR ioctl
without checking the IFF_BROADCAST flag. Call connected_add_ipv4
and connected_add_ipv6 with appropriate flags.
* if_proc.c: (ifaddr_proc_ipv6) Must pass new flags argument to
connected_add_ipv6.
* kernel_socket.c: (ifam_read) Must pass new flags argument to
connected_add_ipv6.
* rt_netlink.c: (netlink_interface_addr) Copy logic from iproute2
to determine local and possible peer address (so there's no longer
a test for IFF_POINTOPOINT). Set ZEBRA_IFA_PEER flag appropriately.
Pass new flags argument to connected_add_ipv6.
(netlink_address) Test !CONNECTED_PEER instead of if_is_broadcast
to determine whether the connected destination address is a
broadcast address.
* bgp_nexthop.c: (bgp_connected_add, bgp_connected_delete)
Simplify logic by using new CONNECTED_PREFIX macro.
* ospf_interface.c: (ospf_if_is_configured, ospf_if_lookup_by_prefix,
ospf_if_lookup_recv_if) Simplify logic using new CONNECTED_PREFIX
macro.
* ospf_lsa.c: (lsa_link_ptop_set) Using the new CONNECTED_PREFIX
macro, both options collapse into the same code.
* ospf_snmp.c: (ospf_snmp_if_update) Simplify logic using new
CONNECTED_ID macro.
(ospf_snmp_is_if_have_addr) Simplify logic using new CONNECTED_PREFIX
macro.
* ospf_vty.c: (show_ip_ospf_interface_sub) Use new CONNECTED_PEER macro
instead of testing the IFF_POINTOPOINT flag.
* ospfd.c: (ospf_network_match_iface) Use new CONNECTED_PEER macro
instead of testing with if_is_pointopoint. And add commented-out
code to implement alternative (in my opinion) more elegant behavior
that has no special-case treatment for PtP addresses.
(ospf_network_run) Use new CONNECTED_ID macro to simplify logic.
* rip_interface.c: (rip_interface_multicast_set) Use new CONNECTED_ID
macro to simplify logic.
(rip_request_interface_send) Fix minor bug: ipv4_broadcast_addr does
not give a useful result if prefixlen is 32 (we require a peer
address in such cases).
* ripd.c: (rip_update_interface) Fix same bug as above.
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2006-10-22 Yar Tikhiy <yar@comp.chem.msu.su>
* (general) Add support for passive-interface default (with
minor edits by Paul Jakma).
* ospf_interface.h: Add OSPF_IF_PASSIVE_STATUS macro, looking
at configured value, or the global 'default' value, as
required.
* ospf_interface.c: (ospf_if_new_hook) Leave passive
unconfigured per default, allowing global 'default' to
take effect for unconfigured interfaces.
* ospf_packet.c: (various) use OSPF_IF_PASSIVE_STATUS
* ospf_vty.c: (ospf_passive_interface_default) new function,
unset passive from all interfaces if default is enabled, as
the per-iface settings become redundant.
(ospf_passive_interface_update) new func, update passive
setting taking global default into account.
({no,}ospf_passive_interface_addr_cmd) Add support for
'default' variant of command.
(show_ip_ospf_interface_sub) Update to take global
default into account when printing passive status.
(ospf_config_write) ditto.
* ospfd.c: (ospf_new) set global passive-interface default.
* ospfd.h: (struct ospf) Add field for global
passive-interface.
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2006-07-26 Paul Jakma <paul.jakma@sun.com>
* ospf_lsa.{c,h}: (ospf_lsa_unlock) Change to take a double pointer
to the LSA to be 'unlocked', so that, if the LSA is freed, the
callers pointer to the LSA can be NULLed out, allowing any further
use of that pointer to provoke a crash sooner rather than later.
* ospf_*.c: (general) Adjust callers of ospf_lsa_unlock to match
previous. Try annotate 'locking' somewhat to show which 'locks'
are protecting what LSA reference, if not obvious.
* ospf_opaque.c: (ospf_opaque_lsa_install) Trivial: remove useless
goto, replace with return.
* ospf_packet.c: (ospf_make_ls_ack) Trivial: merge two list loops,
the dual-loop predated the delete-safe list-loop macro.
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2006-06-15 Paul Jakma <paul.jakma@sun.com>
* Reported by Milan Koci
* ospf_interface.h: (struct ospf_if_info) Add reference counts
for multicast group memberships. Add various macros to help
manipulate/check membership state.
* ospf_interface.c: (ospf_if_set_multicast) Maintain the
ospf_if_info reference counts, and only actually drop
memberships if it hits 0, to avoid losing membership when
OSPF is disabled on an interface with multiple active OSPF
interfaces.
* ospf_packet.c: (ospf_{hello,read}) Use the new macros to
check/set
multicast membership.
* ospf_vty.c: (show_ip_ospf_interface_sub) ditto.
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2006-05-12 Paul Jakma <paul.jakma@sun.com>
* ospf_interface.c: (ospf_if_exists) Fix missing NULL return
check on ospf_lookup, CID #27.
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2006-04-24 Paul Jakma <paul.jakma@sun.com>
* (general) More Virtual-link fixes, again with much help in
testing / debug from Juergen Kammer. Primarily in SPF.
* ospf_spf.h: Add guard. ospf_interface.h will include this
header.
* ospf_interface.h: Modify ospf_vl_lookup definition to take
struct ospf as argument, so as to allow for NULL area
argument.
(struct ospf_vl_data) Remove out_oi, instead add a struct
vertex_nexthop, to use as initial nexthop for backbone paths
through a vlink.
* ospf_interface.c: (ospf_vl_lookup) Modified to allow
NULL area to be passed to indicate "any" (first) area.
Add extra debug.
(ospf_vl_set_params) vl_oi -> nexthop. Add extra debug.
(ospf_vl_up_check) Fix debug, inet_ntoa returns a static
buffer..
* ospf_route.c: (ospf_intra_add_router) Vlinks dont go through
backbone, don't bother checking.
* ospf_spf.c: (static struct list vertex_list) Record vertices
that will need to be freed.
(cmp) Order network before router vertices, as required,
wasn't implemented.
(vertex_nexthop_free) Mild additional robustness check.
(vertex_parent_free) Take void argument, as this function
is passed as list deconstructor for vertex parent list.
(ospf_vertex_new) More debug. Set deconstructor for parent
list. Track allocated vertices on the vertex_list.
(ospf_vertex_free) Get rid of the tricky recursive cleanup of
vertices. Now frees only the given vertex.
(ospf_vertex_add_parent) Fix assert.
(ospf_nexthop_calculation) Fix calculation of nexthop for
VLink vertices, lookup the vl_data and use its previously
recorded nexthop information.
(ospf_spf_calculate) Vertices are freed simply by deleting
vertex_list nodes and letting ospf_vertex_free as deconstructor
work per-node.
(ospf_spf_calculate_timer) Trivial optimisation, leave
backbone SPF calculation till last to reduce SPF churn on
VLink updates.
* ospf_vty.c: (ospf_find_vl_data) update call to ospf_vl_lookup
(no_ospf_area_vlink_cmd) ditto.
(show_ip_ospf_interface_sub) For Vlinks, the peer address is
more interesting than the output interface.
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