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This commit ports some of the OSPFv3 packet reception checks
to OSPFv2.
* ospf_packet.c
* ospf_packet_minlen[]: a direct equivalent of ospf6_packet_minlen[]
* ospf_packet_examin(): new function designed after the first part
of ospf6_packet_examin()
* ospf_read(): verify received packet with ospf_packet_examin()
* ospf_packet.h: add convenience macros
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* ospf_packet.h: add proper str/max extern declarations
* ospf_packet.c
* ospf_packet_type_str: rewrite in "struct message", add max value
* ospf_packet_add(): use LOOKUP()
* ospf_write(): ditto
* ospf_hello(): ditto
* ospf_read(): ditto
* ospf_dump.h: the declaration does not belong here
* ospf_dump.c
* ospf_header_dump(): use LOOKUP()
* show_debugging_ospf(): ditto
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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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* (general) extern and static qualifiers added.
unspecified arguments in definitions fixed, typically they should
be 'void'.
function casts added for callbacks.
Guards added to headers which lacked them.
Proper headers included rather than relying on incomplete
definitions.
gcc noreturn function attribute where appropriate.
* ospf_opaque.c: remove the private definition of ospf_lsa's
ospf_lsa_refresh_delay.
* ospf_lsa.h: export ospf_lsa_refresh_delay
* ospf_packet.c: (ospf_make_md5_digest) make *auth_key const,
correct thing to do - removes need for the casts later.
* ospf_vty.c: Use vty.h's VTY_GET_INTEGER rather than ospf_vty's
home-brewed versions, shuts up several warnings.
* ospf_vty.h: remove VTY_GET_UINT32. VTY_GET_IPV4_ADDRESS and
VTY_GET_IPV4_PREFIX moved to lib/vty.h.
* ospf_zebra.c: (ospf_distribute_list_update_timer) hacky
overloading of the THREAD_ARG pointer should at least use
uintptr_t.
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* ospf_packet.h: Remove commented out definition of
OSPF_MAX_PACKET; neither it or the uncommented one are used any more.
* ospf_packet.c (ospf_make_ls_upd): Leave room for authentication
when deciding if an update will fit.
(ospf_packet_authspace): Factor out calculation of size required
for authentication.
(ospf_make_db_desc): Use ospf_max_packet, not OSPF_MAX_PACKET.
Don't confuse readers that there is a macro.
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* (global) Const char update and signed/unsigned fixes.
* (various headers) size defines should be unsigned.
* ospf_interface.h: remove duplicated defines, include the
authoritative header - though, these defines should probably
be moved to a dedicated header, or ospfd.h.
* ospf_lsa.h: (struct lsa) ls_seqnum should be unsigned.
* ospf_packet.c: (ospf_write) cast result of shift to unsigned.
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