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compatibility
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Conflicts:
proto/bgp/attrs.c
proto/pipe/pipe.c
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unnecessary syscalls"
This reverts commit 7f0e59820899c30a243c18556ce2e3fb72d6d221.
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avoid unnecessary syscalls"
This reverts commit bea582cbb53e30dd32a5b6829c7443e0e5558d11.
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This reverts commit 6cd37713781a3092f8166b2178fae35cbfec1e28.
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This reverts commit a54f75f454b7ed8c8ff2c1787a506528f22cbae7.
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A recent change in Babel causes ifaces to disappear after
reconfiguration. The patch fixes that.
Thanks to Johannes Kimmel for an insightful bugreport.
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For compatibility with older systems use posix_memalign(). We can
switch to aligned_alloc() when we commit to C11 for multithreading.
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Alignment of slabs should be at least sizeof(ptr) to avoid unaligned
pointers in slab structures. Fixme: Use proper way to choose alignment
for internal allocators.
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After switching to 16-way tries, trie format ignored unaligned / internal
prefixes and only reported the primary prefix of a trie node.
Fix trie format by showing internal prefixes based on the 'local' bitmask
of a node. Also do basic (intra-node) reconstruction of prefix patterns
by finding common subtrees in 'local' bitmask.
In future, we could improve that by doing inter-node reconstruction, so
prefixes entered as one pattern for a subtree (e.g. 192.168.0.0/18+)
would be reported as such, like with aligned prefixes.
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The prune loop may may rebuild the prefix trie and therefore invalidate
walk state for asynchronous walks (used in 'show route in' cmd). Fix it
by adding locking that keeps the old trie in memory until current walks
are done.
In future this could be improved by rebuilding trie walk states (by
lookup for last found prefix) after the prefix trie rebuild.
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When rtable is pruned and network fib nodes are removed, we also need to
prune prefix trie. Unfortunately, rebuilding prefix trie takes long time
(got about 400 ms for 1M networks), so must not be atomic, we have to
rebuild a new trie while current one is still active. That may require
some considerable amount of temporary memory, so we do that only if
we expect significant trie size reduction.
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Add counter of prefixes stored in trie. Works only for 'restricted' tries
composed of explicit prefixes (pxlen == l == h), like ones used in rtables.
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Implement flowspec validation procedure as described in RFC 8955 sec. 6
and RFC 9117. The Validation procedure enforces that only routers in the
forwarding path for a network can originate flowspec rules for that
network.
The patch adds new mechanism for tracking inter-table dependencies, which
is necessary as the flowspec validation depends on IP routes, and flowspec
rules must be revalidated when best IP routes change.
The validation procedure is disabled by default and requires that
relevant IP table uses trie, as it uses interval queries for subnets.
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Allow to specify sorted flag, trie fla, and min/max settle time.
Also do not enable trie by default, it must be explicitly enabled.
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When output of 'show route' command was generated, the net_format() was
called for each network prematurely, even if the result was not needed.
Fix the code to call net_format() only when needed. This makes queries
that process many networks but show only few (e.g. 'show route where ..',
or 'show route count') much faster (like 5x - 10x faster).
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Add trie iteration code to rt_show_cont() CLI hook and use it to
accelerate 'show route in <addr>' commands using interval queries.
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Implement 'show route in <addr>' command, which shows all routes in
networks that are subnets of given network. Currently limited to IP
network types.
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Attach a prefix trie to IP/VPN/ROA tables. Use it for net_route() and
net_roa_check(). This leads to 3-5x speedups for IPv4 and 5-10x
speedup for IPv6 of these calls.
TODO:
- Rebuild the trie during rt_prune_table()
- Better way to avoid trie_add_prefix() in net_get() for existing tables
- Make it configurable (?)
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One of previous commits added error logging of invalid routes. This
also inadvertently caused error logging of route loops, which should
be ignored silently. Fix that.
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Most error messages in attribute processing are in rx/decode step and
these use L_REMOTE log class. But there are few that are in tx/export
step and these should use L_ERR log class.
Use tx-specific macro (REJECT()) in tx/export code and rename field
err_withdraw to err_reject in struct bgp_export_state to ensure that
appropriate error reporting macros are called in proper contexts.
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