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The objective is to (as gracefully as possible) deal with outgoing UPDATE
messages which simply do not in the maximum size BGP message. This can
happen if very large AS_PATH or Community attributes come in, and are
then extended. (Sending an UPDATE to an AS2 speaking peer can create
a complete second copy of the AS_PATH !) Previous versions of Quagga
would crash under these circumstances.
Recent version were changed to tolerate and detect oversize messages.
Any oversize message is logged as an error and discarded.
This version will also withdraw prefixes if the selected route simply
cannot be advertised.
This version also corrects the handling of messages which are limited to
the maximum BGP message size -- in particular UPDATE messages which
carry a large number of IPv4/Unicast prefixes. (This was broken by the
earlier efforts to handle oversize messages.)
Changes in this commit:
* update version to 0.99.20ex24b
* where a set of attributes is too big to fit into a BGP message, or
so big that not even one prefix will also fit into a BGP message,
the following steps are now taken:
- the BGP message is discarded and an error logged (as in other
recent versions -- Quagga does not crash).
- any prefixes which should have been advertised with the (broken)
attributes will be withdrawn, if they have been advertised earlier
with valid attributes.
A further error is logged, listing the affected prefixes.
- prefixes which are suppressed in this way are not counted as
having been sent.
At present there is no "show" command which will show which prefixes have
been suppress -- TBA.
* for all AFI/SAFI announce as many withdrawn prefixes as will fit in a
BGP message.
Previously, all AFI/SAFI other than IPv4/Unicast would send one withdrawn
prefix per message.
(This is still the case for announcements. It seems unlikely that
many IPv6 prefixes will have the same attributes... so this does not
seem worth fixing immediately.)
* ensure that NOTIFICATION message cannot exceed the maximum length of a
BGP message, no matter how much data is sent (!).
* where IPv4/Unicast prefixes share the same attributes, they are now
announced in the order received.
Previously, when prefixes were added to the list hung off the
'struct bgp_advertise_attr', they were in LIFO order.
* add SAFI name table.
* log pthread attributes when creating a pthread.
* fix scheduling of withdrawn prefixes to reduce number of BGP messages
generated.
Bug fixes:
* fix discard of invalid IPv6 link-local nexthop (recent bug).
* where amount of information that is put into a BGP message is limited by
the maximum message size, fix so that this works again. (This was
broken recently.)
* set "Bottom of Stack" bit in MPLS VPN "tag" in MP_REACH and MP_UNREACH
outgoing attributes.
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bgpd/bgp_advertise.c
bgpd/bgp_advertise.h
The adj_in and adj_out objects are now put on a list based
on the peer to whom the route belongs.
The adj_in and adj_out objects also now point to the bgp_node
which they are routes for.
This substantially reduces the work needed to shut down a peer.
bgpd/bgp_damp.c
Changes to adj_in and adj_out forced small change to macros
used in bgp_damp.c to manage its lists.
bgpd/bgp_debug.c
Replaced direct access to vty->node by the required vty_get_node().
bgpd/bgp_dump.c
Changes to the names of fields in bgp_info structures.
bgpd/bgp_engine.h
Modified the debug and trace functions.
bgpd/bgp_fsm.c
Make use of sockunion2str() consistent with common usage.
Improved some documentation.
bgpd/bgp_main.c
Use the newly extended qpn_add_hook_function() facility.
bgpd/bgp_mplsvpn.c
Changes to the names of fields in bgp_info structures.
bgpd/bgp_msg_read.c
Bug fix: correct handling of capability code length.
Improvement: better casting in calculation of message length.
bgpd/bgp_msg_write.c
Bug fix: correct byte ordering of bgp_id in open message.
bgpd/bgp_network.c
Bug fix: correct handling of incoming connections.
Takes advantage of improvements in sockunion.c.
bgpd/bgp_nexthop.c
Changes to the names of fields in bgp_info structures.
bgpd/bgp_open_state.c
Remove mistaken #include of memtypes.h
bgpd/bgp_packet.c
Improvements to handling of withdrawing routes for peers.
bgpd/bgp_peer.c
Tidying up the state of peers as they are enabled and disabled.
Improvements to handling of withdrawing routes for peers.
bgpd/bgp_peer.h
Adding list bases for lists of routes originated by the peer.
bgpd/bgp_peer_index.c
Bug fix: correct freeing of peer indexes.
bgpd/bgp_route.c
Implement lists of bgp_info based in the owning peer. Adjust
for name changes to bgp_info fields.
Reimplemented all the clearing functions to use the lists of
items that belong to the peer -- rather than searching route
tables for stuff to withdraw.
Changed work queue handling for added/changed routes, so
that queues run through existing items, rather than having
queues of auxiliary items -- lower memory overhead.
bgpd/bgp_route.h
Added fields to bgp_info to allow all bgp_info originated by
each peer to live on lists based in the peer. And changed the
name of existing fields to avoid confusion.
bgpd/bgp_routemap.c
Removing redundant code and fixing a memory leak.
bgpd/bgp_table.h
Based work queue for added/changed routes directly in the
table, rather than having auxiliary structures.
bgpd/bgp_vty.c
Use vty_get_node() and vty_set_node() rather than direct
access to the vty field.
bgpd/bgpd.c
Implement changes to route clearing.
bgpd/bgpd.h
Changes to work queue handling.
lib/buffer.c
Changes to allow embedded buffer structures.
lib/buffer.h
Moved struct buffer here so that could have embedded buffer
structurs.
lib/command.c
Substantial tidy up and document exercise.
Restructured the top level command processing and finding
of descriptions and command completion.
Removal of unpleasant messing around with the insides of
vector structures.
Movement of some command actions to vty.c.
Uses uty.h to pick up the "private" functions from vty.c
et al.
lib/command.h
Moved the "node" values to node_type.h, so that can use an
enum node_type in places where cannot include command.h.
lib/command_queue.c
Updated to cope with the called command changing the node
value.
Improved handling of revoked commands, so the the command
line handler does not get stuck waiting for a command to
complete which has been revoked !
lib/command_queue.h
Improved message format.
lib/if.c
Use vty_set_node().
lib/keychain.c
Use vty_set_node().
new lib/keystroke.c
new lib/keystroke.h
New code to implement a keystroke FIFO.
This moves some complexity out of the command handler.
The handling of mixtures of escapes and Telnet IACs is
tightened up.
It would be possible to extend this to, say, UTF-8.
Regularises the "stealing" of keystrokes for the "--more--"
output handling... which was a bit hit and miss.
new lib/list_util.c
new lib/list_util.h
New code to implement various forms of linked list,
where the list pointers are embedded in structures.
lib/log.c
Changed the handling of log messages, so that all types
of log output (except syslog) use the same message buffer
scheme, and the message is constructed once and once
only.
Changes to the handling of VTY_LOCK() etc.
Uses uty.h to pick up the "private" functions from vty.c
et al.
lib/log.h
Changes to the buffering of log messages.
new lib/mem_tracker.c
New code to track memory allocation/deallocation, for
debug purposes.
lib/memory.c
lib/memory.h
Updated to allow the use of the mem_tracker.
lib/memtypes.awk
Made the memtypes into a named enum MTYPE.
lib/memtypes.c
Various new memory types.
lib/mqueue.c
lib/mqueue.h
Add mqueue_finish function for close-down.
lib/network.c
lib/network.h
Added non-blocking read_nb() and write_nb().
new lib/node_type.h
As above.
lib/plist.c
Remove vty_puts() which wasn't a good idea.
lib/qlib_init.c
Added qps_init() to first stage and mqueue_finish to
finish.
lib/qpnexus.c
lib/qpnexus.h
More flexible hooks for in_thread_init and in_thread_final.
lib/qpselect.c
lib/qpselect.h
Added qps_start_up() to build the required maps once and
for all.
Added qdebug to control the debug checks and validation.
Improved validation and test functions.
new lib/qstring.c
new lib/qstring.h
New code for limited flexible string handling.
lib/qtimers.c
Added qdebug to control the debug checks and validation.
lib/routemap.c
Use vty_set_node().
lib/sockunion.c
lib/sockunion.h
Tidied up and regularised the handling of sin_len and
sin6_len.
Created common function for setting port into socket.
Created common function for initialisation/allocation of
new sockunion.
Reduced various functions by using common sub-functions.
Rationalised some code.
Added sockunion_listen() and sockunion_new_sockaddr().
Renamed sockunion_new() to sockunion_new_prefix().
Improved some logging messages.
Added documentation.
new lib/uty.h
Functions etc. used only by vty/command/log/vty_io and
vty_cli.
lib/vector.c
lib/vector.h
Added vector_t type.
Removed VECTOR_INDEX, vector_only_wrapper_free() and
vector_only_index_free() -- following improvement of
code in command.c.
Added vector_set_min_length(), vector_set_new_min_length()
and vector_length() functions.
new lib/vio_fifo.c
new lib/vio_fifo.h
New code to manage simple FIFO of indefinite length.
lib/vty.c
lib/vty.h
Reworked. Broken into vty.c, vty_io.c and vty_cli.c.
new lib/vty_cli.c
new lib/vty_cli.h
CLI handling parts of the vty family.
new lib/vty_io.c
new lib/vty_io.h
I/O parts of the vty family.
lib/workqueue.h
Introduced tyedefs for the various call-back entries.
new tests/test-list_util.c
Tests for the list-util stuff.
vtysh/vtysh.c
Small change to interface for cmd_execute_command()
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Finish the wiring required to get bgp_msg_read to process OPEN
messages into the connection's open_state, and be able to check
for correct peer AS, etc.
Removed bugs preventing messages from being written.
Added BGP Id check to collision detection logic.
Removed as many warnings from comilation as possible. Replaced
horrible FIFO kludge in the process. (Introduced the even more
horrible miyagi kludge.)
modified: bgpd/bgp_advertise.c
modified: bgpd/bgp_advertise.h
modified: bgpd/bgp_connection.c
modified: bgpd/bgp_connection.h
modified: bgpd/bgp_debug.c
modified: bgpd/bgp_fsm.c
modified: bgpd/bgp_msg_read.c
modified: bgpd/bgp_msg_write.c
modified: bgpd/bgp_network.c
modified: bgpd/bgp_nexthop.c
modified: bgpd/bgp_notification.c
modified: bgpd/bgp_open.c
modified: bgpd/bgp_packet.c
modified: bgpd/bgp_session.c
modified: bgpd/bgp_session.h
modified: bgpd/bgpd.c
modified: lib/Makefile.am
modified: lib/distribute.c
modified: lib/if_rmap.c
new file: lib/miyagi.h
modified: lib/prefix.h
modified: lib/sockopt.c
modified: lib/stream.c
modified: lib/thread.c
modified: lib/vty.c
modified: lib/zebra.h
modified: tests/bgp_capability_test.c
modified: tests/bgp_mp_attr_test.c
modified: tests/ecommunity_test.c
modified: tests/heavy-thread.c
modified: tests/heavy-wq.c
modified: tests/heavy.c
modified: tests/main.c
modified: tests/test-checksum.c
modified: tests/test-sig.c
modified: watchquagga/watchquagga.c
modified: zebra/if_netlink.c
modified: zebra/ioctl.c
modified: zebra/rt_netlink.c
modified: zebra/rtread_netlink.c
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* (global) The great bgpd extern and static'ification.
* bgp_routemap.c: remove unused ROUTE_MATCH_ASPATH_OLD code
(route_set_metric_compile) fix u_int32_t to ULONG_MAX comparison
warnings.
* bgp_route.h: (bgp_process, bgp_withdraw, bgp_update) export these
used by various files which had their own private declarations,
in the case of mplsvpn - incorrect.
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* bgp_fsm.h: Add extern qualifier to exported functions
* bgp_nexthop.c: add static to nexthop specific globals
* *.h: Add guard defines
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