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routes. Use a growable buffer (bgp_nexthop_buf) to collect nexthops
that are included in the announcement. Use the BGP_INFO_MULTIPATH_CHG
flag to trigger zebra announcement so zebra will be updated if the
multipath set changes. Display all multipath nexthops in
'debug bgp zebra' output.
* bgpd/bgp_main.c
* bgp_exit(): Free bgp_nexthop_buf when exiting
* bgpd/bgp_route.c
* bgp_process_rsclient(): Clear BGP_INFO_MULTIPATH_CHG after processing
* bgp_process_main(): Check BGP_INFO_MULTIPATH_CHG to trigger zebra
announcement and clear aftr processing
* bgpd/bgp_zebra.c
* bgp_nexthop_buf: Growable buffer used to collect nexthops for zebra
announcement
* bgp_zebra_announce(): Grow bgp_nexthop_buf if needed. Include
multipath count in zebra announcement and add all nexthops to
bgp_nexthop_buf. Pass bgp_nexthop_buf data to zebra announcement.
Added nexthops to debug output.
* bgp_zebra_init(): Initialize bgp_nexthop_buf at startup
* bgpd/bgp_zebra.h
* BGP_NEXTHOP_BUF_SIZE: Default initial bgp_nexthop_buf size has room
for 8 nexthops
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information based on the multipath list (mp_list) generated during
the best path calculation. Display "multipath" for paths that are
multipath and also on bestpath if the route is multipath. Flag a
best path with the BGP_INFO_MULTIPATH_CHG if the multipath
set has changed since the last update. This can be used to trigger
updates to zebra and peers.
The multipath markup is a lazily allocated bgp_info_mpath structure
that is added to the best path and any multipaths. The mpath structures
are linked together with the best path element at the head and the
other elements ordered by nexthop and then by peer address. This
markup scheme is updated by calling bgp_info_mpath_update() and passing
in a new mp_list the the current multipath set. There are additional
API's for walking the multipath set, querying the count of multipaths,
and for cleaning up the multipath markup information when freeing path
information.
* bgpd/bgp_mpath.c
* bgp_info_mpath_new(): Allocation of new mpath element
* bgp_info_mpath_free(): Release memory for mpath element
* bgp_info_mpath_get(): Access mpath element of path. Allocate memory
on-demand
* bgp_info_mpath_enqueue(): Enqueue a path onto the multipath list
* bgp_info_mpath_dequeue(): Remove a path from the multipath list
* bgp_info_mpath_first(): Return first path on the multipath list
* bgp_info_mpath_next(): Return next path on the multipath list
* bgp_info_mpath_count(): Return the number of paths on the multipath list
* bgp_info_mpath_count_set(): Set the number of paths on the multipath list
* bgp_info_mpath_update(): Update multipath markup on bgp route table entry
and flag any changes. Emit 'debug bgp event' output on any multipath
change.
* bgpd/bgp_mpath.h
* struct bgp_info_mpath: Information added to a bgp_info path to record
multipath information
* External declarations for new functions in bgp_mpath.c
* bgpd/bgp_route.c
* bgp_info_free(): Free mpath memory when freeing path information
* bgp_info_reap(): Dequeue path from multipath queue before deleting it
* bgp_best_selection(): Calls bgp_info_mpath_update() with latest
mp_list to mark-up rib table entry
* bgp_vty_out_detail(): Add display of multipath flag for a path. Also
display 'multipath' for bestpath if it is a multipath route
* bgpd/bgp_route.h
* struct bgp_info: Add pointer to bgp_info_mpath information
* Add flags to mark a path as multipath (BGP_INFO_MULTIPATH) and
to mark bestpath if multipath information has changed
(BGP_INFO_MULTIPATH_CHG)
* lib/memtypes.c
* Add MTYPE_BGP_MPATH_INFO for allocating memory for bgp_info_mpath
* tests/bgp_mpath_test.c
* Add test case for bgp_info_mpath_update() and supporting functions
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equal to the best path are accumulated onto an ordered list (mp_list)
if maximum-paths is configured. A future commit will add the
multipath markup to the BGP rib table based on the mp_list. Add
unit test for the added mp_list functions.
Deterministic MED is not supported in this commit, it will be
added later.
* bgpd/bgp_aspath.c
* Make aspath_cmp() an external symbol so it can be used in
equivalent paths check
* bgpd/bgp_aspath.h
* Add extern declaration of aspath_cmp()
* bgpd/bgp_mpath.c
* bgp_info_nexthop_cmp(): Compares nexthops of two paths
* bgp_info_mpath_cmp(): Compare function to order multipaths by
nexthop and then by peer address
* bgp_mp_list_init(): Initialize a list with the multipath order function
* bgp_mp_list_clear(): Clear out the mp_list
* bgp_mp_list_add(): Add a multipath to mp_list
* bgpd/bgp_mpath.h
* External declarations for above added functions in bgp_mpath.c
* bgpd/bgp_route.c
* bgp_info_cmp(): Add equivalent paths result (paths_eq). If eBGP
paths are equal down to IGP metric check, flag as equal if peer AS
matches. Similarly for iBGP paths but compare full AS_PATH.
* bgp_best_selection(): If multipath is enabled, accumulate equivalent paths
in mp_list. Add debug bgp event output to see result (will be filtered
later to display only when change occurs)
* bgp_process_rsclient(): Pass multipath config to bgp_best_selection()
* bgp_process_main(): Pass multipath config to bgp_best_selection()
* tests/bgp_mpath_test.c
* Add unit test case for bgp_mp_list functions
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There is support to configure this for each (AFI,SAFI), but
currently this configuration is only present for IPv4 unicast:
maximum-paths [ibgp] <1-255>
no maximum-paths [ibgp] [<1-255>]
* bgpd/Makefile.am
* Add bgp_mpath.h and bgp_mpath.c to build
* bgpd/bgp_mpath.h
* New file for bgp multipath declarations
* define BGP_DEFAULT_MAXPATHS
* bgpd/bgp_mpath.c
* bgp_maximum_paths_set(): Configure maximum paths for the given
afi, safi and bgp instance
* bgp_maximum_paths_unset(): Return maximum paths configuration to
the default setting for the given afi, safi and bgp instance
* bgpd/bgp_vty.c
* Define command strings for above CLI
* bgp_config_write_maxpaths(): Outputs configuration for the given
afi, safi and bgp instance
* Install command elements for IPv4 unicast
* bgpd/bgp_zebra.h
* bgp_config_write_maxpaths(): External declaration
* bgpd/bgpd.c
* bgp_create(): Initialize bgp instance to default maximum paths setting
* bgp_config_write_family(): Output maximum paths configuration
for the given address family
* bgp_config_write(): Output maximum paths configuration for
IPv4 unicast address family
* bgpd/bgpd.h
* struct bgp: Add storage for maximum paths configuration for
each afi, safi
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* bgp_aspath.c: (assegments_parse) just bail early if length doesn't match
and fix the formatting.
* bgp_network.c: add include needed for set_nonblocking
* bgp_packet.c: formatting
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* bgp_routemap.c: (route_set_community_delete) When deleting a
community in a route-map the old community was being orphaned. Like
the description of the same code in route_set_community, this is a
hack, not a true fix.
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This reverts commit 2c9fd7e07283b8904ef20030c9dadb032e999b12.
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* bgp_attr.c: (attrhash_key_make) 98e30f should have changed jhash2 to jhash.
These kinds of merge errors would be reduced and life would be easier if
people would submit fully-formed fixes that could be chucked directly into
git-am.
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* bgpd.h: Add error code for setting GTSM on iBGP
* bgpd.c: (peer_ttl_security_hops_set) use previous error code and signal
incompatibility of GTSM+iBGP to vty.
Consider the session state when setting GTSM, and reset Open/Active peers
to let them pick up new TTL from start.
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* bgp_vty.c: (peer_ebgp_multihop_{un,}set_vty) tail-call cleanup.
({no_,}neighbor_ttl_security) ditto.
* bgpd.c: (peer_ttl_security_hops_set) Peer group checks and TTL set only
need to be done on transition.
* sockunion.c: (sockopt_minttl) remove always-on debug and improve readability.
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* bgpd: Add support for RFC 5082 GTSM, which allows the TTL field to be used
to verify that incoming packets have been sent from neighbours no more
than X IP hops away. In other words, this allows packets that were sent from
further away (i.e. not by the neighbour with known distance, and so possibly
a miscreant) to be filtered out.
* lib/sockunion.{c,h}: (sockopt_minttl) new function, to set a minimum TTL
using the IP_MINTTL socket opt.
* bgpd.h: (BGP_ERR_NO_EBGP_MULTIHOP_WITH_TTLHACK) define for command
error for minttl.
(struct peer) add a config variable, to store the configured minttl.
(peer_ttl_security_hops_{set,unset}) configuration handlers
* bgpd.c: (peer_group_get) init gtsm_hops
(peer_ebgp_multihop_{un,}set) check for conflicts with GTSM. Multihop and
GTSM can't both be active for a peer at the same time.
(peer_ttl_security_hops_set) set minttl, taking care to avoid conflicts with
ebgp_multihop.
(bgp_config_write_peer) write out minttl as "neighbor .. ttl-security hops X".
* bgp_vty.c: (bgp_vty_return) message for
BGP_ERR_NO_EBGP_MULTIHOP_WITH_TTLHACK
(peer_ebgp_multihop_{un,}set_vty)
* bgp_network.c: (bgp_accept) set minttl on accepted sockets if appropriate.
(bgp_connect) ditto for outbound.
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* bgp_route.c: ({no_,}ipv6_bgp_network_ttl_cmd) depends on ipv6_bgp_network
which is HAVE_IPV6, so these should be too.
(bgp_route_init) and the installs should be similarly ifdefed
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* bgp_attr.c; (attrhash_key_make) s6_addr is only member of in6_addr
guaranteed to be available - s6_addr32 isn't. Fix to be more portable, and
thus allow compilation on BSD again.
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* bgp_packet.c: (bgp_write) On BGP write, use TCP_CORK to provide hints to
kernel about TCP buffering. This will cause BGP packets to occur in
bigger chunks (full size MTU), improving performance and getting rid of
one of the problems reported in the UNH BGP conformance test.
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* bgpd: Rather than toggling socket in/out of non-block mode, just leave it
in nonblocking mode.
One exception is in bgp_notify which only happens just before close.
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* bgp_community.[ch]: (community_lookup) New helper function to look
up a community list in the hash table.
* bgp_routemap.c: A new community structure was being allocated for
every BGP update which matched a route map which set a community.
This behavior led to rapid growth in the memory consumed by bgpd.
Adding the communities to the hash table addresses the memory
growth, but may introduce a problem in modifying or deleting the
'set community' statement in the route map.
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Many show commands do not have support for multiple views and do not
treat different address families uniformly. The following changes add
a number of commands with support for views and rationalized treatment
of IPv4 v IPv6 and unicast v multicast (such as in JUNOS, IOS XR and
more recent versions of IOS).
* bgp_route.c: (bgp_show_community) Inserted a new second argument (the
name of the view) and the code to look up that name in the BGP structure.
The NULL argument in the call to bgp_show (indicating the default view)
was replaced by the specified view. The existing calls to
bgp_show_community had a NULL second argument inserted to make clear
that they refer to the default view.
(top level) Added new functions via the DEFUN and/or ALIAS macros (and
the associated command table entries) to add the commands
show bgp ipv4 (unicast|multicast)
show bgp ipv4 (unicast|multicast) A.B.C.D
show bgp ipv4 (unicast|multicast) A.B.C.D/M
show bgp ipv6 (unicast|multicast)
show bgp ipv6 (unicast|multicast) X:X::X:X
show bgp ipv6 (unicast|multicast) X:X::X:X/M
These show either the full BGP table or the specified route or
prefix for the given address family.
show bgp view WORD (ipv4|ipv6) (unicast|multicast) community
show bgp view WORD (ipv4|ipv6) (unicast|multicast) community \
(AA:NN|local-AS|no-advertise|no-export){1,4}
For the specified view and address family, these show entries
matching any community or the specified communit(y)(ies).
show bgp view WORD (ipv4|ipv6) (unicast|multicast) neighbors \
(A.B.C.D|X:X::X:X) (advertised-routes|received-routes)
For the specified view and address family, show the routes
advertised to or received from the given BGP neighbor.
show bgp [view WORD] ipv4 (unicast|multicast) \
rsclient (A.B.C.D|X:X::X:X)
show bgp [view WORD] ipv4 (unicast|multicast) \
rsclient (A.B.C.D|X:X::X:X) A.B.C.D
show bgp [view WORD] ipv4 (unicast|multicast) \
rsclient (A.B.C.D|X:X::X:X) A.B.C.D/M
show bgp [view WORD] ipv6 (unicast|multicast) \
rsclient (A.B.C.D|X:X::X:X)
show bgp [view WORD] ipv6 (unicast|multicast) \
rsclient (A.B.C.D|X:X::X:X) X:X::X:X
show bgp [view WORD] ipv6 (unicast|multicast) \
rsclient (A.B.C.D|X:X::X:X) X:X::X:X/M
For the specifed (optional) view and address family, show either
the full BGP table or the specified route or prefix for the given
route server client peer.
* bgp_vty.c: (top level) Added new functions via the DEFUN and/or ALIAS
macros (and the associated command table entries) to add the commands
show bgp [view WORD] (ipv4|ipv6) (unicast|multicast) summary
show bgp [view WORD] (ipv4|ipv6) (unicast|multicast) rsclient summary
For the specified (optional) view and address family, display
either the normal summary table for BGP peers, or the route server
client table showing the import and export policies.
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* draft-ietf-idr-as-pathlimit doesn't seem to have gone anywhere, and its
author does not think it will make progress in IDR. Remove all support
introduced for it, but leave stubs for the commands to avoid breaking
any configurations.
Basically reverts cecab5e9725792e60a5e4b473e238a14cd85815d.
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* bgp_attr.c: (bgp_attr_ext_communities) Certain extended-community attrs
can leave attr->flag indicating ext-community is present, even though no
extended-community object has been attached to the attr structure. Thus a
null-pointer dereference can occur later.
(bgp_attr_community) No bug fixed here, but tidy up flow so it has same
form as previous.
Problem and fix thanks to anonymous reporter.
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* bgp_attr.c: I observed while doing some debugging that even for simple
tests there was a lot of hash collisions for BGP attributes. Switch to
using Jhash rather than additive hashing. Probably overkill, but the
function is fast and available.
({attrhash,cluster,transit}_hask_key_make) convert to Jenkins hash,
instead of additive hash.
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If the radix tree creates an extra interior node in bgp_node_get(),
it locks the interior node even though this node is not returned to
the caller, so it may never be unlocked. The lock prevents this node
from being deleted.
* bgpd/bgp_table.c: (bgp_node_get) Remove lock on interior node which
prevents proper node deletion
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* bgp_route.c: (route_vty_out*) The local prefix, metric and weight values
are all stored as uint32_t. Change the format to %u so that large values
are not displayed as negative integers.
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* bgp_route.c: (bgp_static_update_rsclient) BGP sometimes crashes when
removing route server client because of use after free.
The code to update rsclient created a local static copy of bgp attributes
but neglected to handle the extra information pointer. The extra
information was getting freed by bgp_attr_unintern() and reused later when
the copy was passed to bgp_attr_intern().
The fix is to use the attr_dup function to create a copy of the extra
information, then clean it up.
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* bgp_route.c: (bgp_aggregate_set) make sure to unlock BGP node if failure
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* bgpd: (bgp_aggregate_{set,unset,delete}) This fixes locking and other
issues with aggregate set/unset command
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* bgpd: (bgp_damp_parameter_set) The BGP reuse_index is not initialized
properly. This would cause sporadic crash when disabling dampening. Use
XCALLOC correctly and the right size array is initialized and no memset is
needed.
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* bgpd: Connected table locks were being locked but not unlocked, such that
eventually a lock would exceed 2^31 and become negative, thus triggering
an assert later on.
* bgp_main.c: (bgp_exit) delete connected elements along with ifp's.
* bgp_nexthop.c: (bgp_nexthop_lookup{,_ipv6}) add missing unlocks
(bgp_multiaccess_check_v4) ditto
(bgp_connected_{add,delete}) Use a distinct memtype for bgp_connected_ref.
(bgp_scan_finish) reset the nexthop cache to clean it up when bgpd exits
* bgp_route.c: fix missing bgp_node unlocks
* lib/memtype.c: (memory_list_bgp) add MTYPE_BGP_CONN
* testing: has been tested for almost 2 months now.
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Older versions of Quagga/Zebra would output a value in MRT table
dump files for "uptime" aka "ORIGINATED" that was a WALL clock
value. Given that uptime is now internally a bgp_clock MONOTONIC
value, the output in the MRT files is showing up as monotonic.
Note: time of MRT dump is still recorded correctly as a
time() based value, so we haven't lost that value.
Proposal is to correct the uptime output on the vty and in the
MRT files to again display something more akin to WALL time.
* bgp_dump.c: (bgp_dump_routes_func) add conditional correction
* bgp_route.c: (route_vty_out_detail) make correction conditional, move
variable declaration to beginning of the function
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* bgpd/bgp_debug.c: fix VTY strings for BGP debug commands to match
correct syntax
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* bgp_packet.c: (bgp_notify_receive) justify the difference between
BGP_NOTIFY_OPEN_UNSUP_PARAM and BGP_NOTIFY_OPEN_UNSUP_CAPBL cases, as
it is explained in RFC5492, page 3, paragraph 1.
"Unsupported Capability" error does not mean, that the peer doesn't
support capabilities advertisement -- quite the opposite (if the peer
would not support capabilities advertisement, the code would be
"Unsupported Optional Parameter"). Thus there is no reason to mark
the peer as one non-supporting capabilities advertisement.
Example: suppose the peer is in fact IPv6-only, but we didn't configure
anything address-family specific for it. Then, the peer would refuse
the session with "Unsupported Capability" code. If we internally set
the peer as non-supporting capabilities advertisement after that, we
will not be able to establish the session with it ever, even with a
fixed configuration -- IPv6-only BGP session cannot be established
without capabilities.
In practice an edge case would be seen as the same IPv6 peer working
with its "neighbor" block read from bgpd.conf, but not working, when
slowly input in "conf t" mode.
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* bgp_route.c: (bgp_process_queue_init) rsclient wasn't getting all the
same things initialised as the main queue. Simplify to make it more robust.
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* bgp_vty.c: (community_list_perror, show_ip_community_list_arg,
show_ip_extcommunity_list_arg) fix spelling
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* bgp_route.c: (route_vty_out_detail) calculate time value
in a way, which works regardless of monotonic clock
being used or not
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* bgpd/bgp_attr.c, bgpd/bgp_open.h, bgpd/bgp_route.c, lib/prefix.c,
lib/prefix.h: Various integer types were being used where, if we
had strict type checking, afi_t and safi_t would be required.
Signed-off-by: G.Balaji <balajig81@gmail.com>
(cherry picked from commit c8af35ffa2dc79ff7d7ff00b1b61f1f50a100ab6)
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bgpd/bgp_packet.c:bgp_update_packet(): When extracting the peer, don't
fail to extract it because "binfo->extra" is NULL. While one should
certainly avoid dereferencing binfo->extra, that's not a good reason
not to use binfo->peer.
Fixes https://bugzilla.quagga.net/show_bug.cgi?id=497.
Patch by Eric Sobocinksi.
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* bgpd/bgp_aspath.c
* assegments_parse(): add handling of AS4_PATH input, update bounds
checks, add check for AS segment type
* aspath_parse(): add handling of AS4_PATH input, expect
assegments_parse() to do length checking
* aspath_empty(): update for the new function prototype
* bgpd/bgp_aspath.h: ditto
* tests/aspath_test.c: ditto
* bgpd/bgp_attr.c
* bgp_attr_aspath(): add handling of AS4_PATH input, update flags
checks, change returned type
* bgp_attr_as4_path(): discard, superseded by bgp_attr_aspath()
* bgp_attr_parse(): update respectively
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* bgp_packet.c: (bgp_route_refresh_receive) add validation of
"Length" (RFC5292) field value, check input stream bounds
each time bytes are pulled from it
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BGP uses time() to get system time of day; but that value
fluctuates with time adjustments from NTP. This can cause premature
flapping of peer sessions and other failures.
Use the system monotonic clock supported by Quagga thread library
to avoid issue.
See: http://bugzilla.vyatta.com/show_bug.cgi?id=4467
* bgpd/bgp_fsm.c
* bgp_uptime_reset(): dismiss function
* bgpd/bgpd.c
* bgp_clock(): new function
* bgpd/bgp_damp.c
* bgp_reuse_timer(): employ bgp_clock() instead of time(NULL)
* bgp_damp_withdraw(): idem
* bgp_damp_update(): idem
* bgp_damp_scan(): idem
* bgp_damp_info_vty(): idem
* bgp_damp_reuse_time_vty(): idem
* bgpd/bgp_fsm.c
* bgp_routeadv_timer(): idem
* bgp_stop(): idem
* bgp_establish(): idem
* bgpd/bgp_packet.c
* bgp_update_receive(): idem
* bgpd/bgp_route.c
* bgp_update_rsclient(): idem
* bgp_update_main(): idem
* bgp_static_update_rsclient(): idem
* bgp_static_update_main(): idem
* bgp_static_update_vpnv4(): idem
* bgp_aggregate_route(): idem
* bgp_aggregate_add(): idem
* bgp_redistribute_add(): idem
* bgpd/bgp_snmp.c
* bgpPeerTable(): idem
* bgpTrapEstablished(): idem
* bgpTrapBackwardTransition(): idem
* bgpd/bgpd.c
* peer_create(): idem
* peer_uptime(): idem
* bgp_master_init(): idem
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* bgpd/bgp_aspath.c
* ashash: only used in one file, make static
* aspath_count_numas(): dead code, sayonara
* bgpd/bgpd.c
* peer_nsf_stop(): only used in one file, make static
* bgpd/bgp_packet.h
* bgp_capability_receive(): add missing prototype for a
global function
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* bgpd/bgp_fsm.c
* bgp_clearing_completed(): only used in one file, can be static
* bgpd/bgp_packet.c
* afi2str(): sayonara
* safi2str(): sayonara
* bgpd/bgp_route.c
* bgp_distance_reset(): sayonara
* bgpd/bgp_zebra.c
* bgp_ifindex_by_nexthop(): sayonara
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Make one version of check prefix bit, and put it inline
with proper prototype. This gets rid of some macro's and also some
assert() that can never happen on a non-broken compiler.
* bgpd/bgp_table.c
* CHECK_BIT(): sayonara
* check_bit(): sayonara
* SET_LINK(): sayonara
* set_link(): make use of prefix_bit() instead of check_bit()
* bgp_node_match(): idem
* bgp_node_lookup(): idem
* bgp_node_get(): idem
* lib/prefix.h
* prefix_bit(): new inline version of check_bit()
* lib/table.c
* CHECK_BIT(): sayonara
* check_bit(): sayonara
* SET_LINK(): sayonara
* set_link(): make use of prefix_bit() instead of check_bit()
* route_node_match(): idem
* route_node_lookup(): idem
* route_node_get(): idem
* ospf6d/ospf6_lsdb.c
* CHECK_BIT(): sayonara
* ospf6_lsdb_lookup_next(): make use of prefix_bit() instead of
CHECK_BIT()
* ospf6_lsdb_type_router_head(): idem
* ospf6_lsdb_type_head(): idem
* ospf6d/ospf6_route.c
* CHECK_BIT(): sayonara
* ospf6_route_match_head() make use of prefix_bit() instead of
* CHECK_BIT()
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* bgp_network.c: (bgp_md5_set) Missing piece from earlier listener change
did not get ported from Vyatta code into upstream. The list
listener_sockets changed from (int *) to (struct bgp_listener *).
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* bgp_network.c: (bgp_accept) The code in current git will crash as part of
the revised listener code is missing. The new listener thread code passes
a pointer to a bgp_listener structure, not the bgp pointer. The old code
always got a NULL for bgp pointer, so that is now hard coded.
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* bgp_filter.h: Gcc complains the function prototype is not correct because
the function argument is using old K&R style.
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* bgpd.c: (peer_lookup_with_open) Bodged application of previous patch
meant the second loop around bgp->peer wasn't included in the loop
around bm->bgp as it was supposed to be. Fix..
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* bgp_attr.c: (bgp_mp_reach_parse) There are some interoperability issues
for MBGP (particularly IPv4 multicast NLRI) between different
implementations. In order to get some next hops to install correctly in
the BGP tables, it appears to be necessary to copy the multiprotocol next
hop into the base next hop field. This is related to differences in RFC
2283 and RFC 2858.
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