| Commit message (Collapse) | Author | Age | Files | Lines |
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This is the actual callback used to parse nftables rules. Pass
nft_handle to it so it can access the cache (and possible sets therein).
Having to pass nft_handle to nft_rule_print_save() allows to simplify it
a bit since no family ops lookup has to be done anymore.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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When operating on a single chain only, compatibility checking causes
unwanted overhead by checking all chains of the current table. Avoid
this by accepting the current chain name as parameter and pass it along
to nft_chain_list_get().
While being at it, introduce nft_assert_table_compatible() which
calls xtables_error() in case compatibility check fails. If a chain name
was given, include that in error message.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Accept an additional chain name pointer in __nft_build_cache() and pass
it along to fetch only that specific chain and its rules.
Enhance nft_build_cache() to take an optional nftnl_chain pointer to
fetch rules for.
Enhance nft_chain_list_get() to take an optional chain name. If cache
level doesn't include chains already, it will fetch only the specified
chain from kernel (if existing) and add that to table's chain list which
is returned. This keeps operations for all chains of a table or a
specific one within the same code path in nft.c.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The amount of code dealing with caching only is considerable and hence
deserves an own source file.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The only thing missing was handling of EBTABLES_SAVE_COUNTER env var,
but that can be done after parsing parameters in bridge-specific code.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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With all preparations in place, xtables_save_main() can replace it with
not further changes.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Let callers define the flags to pass to nft_rule_save() instead of just
setting the counters boolean.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Explicit commits are not used by either arp- nor ebtables-save. In order
to share code between all the different *-save tools without inducing
changes to ruleset dump contents, allow for callers of do_output() to
turn COMMIT lines on or off.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Introduce variables for the different optstrings so short and long
options live side-by-side.
In order to make xtables_save_main() more versatile, pass optstring and
longopts via parameter.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Also move time() calls to where they are used.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Support passing arbitrary data (via void pointer) to the callback.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The builtin table check guarding the 'is incompatible' warning was
wrong: The idea was to print the warning only for incompatible tables
which are builtin, not for others. Yet the code would print the warning
only for non-builtin ones.
Also reorder the checks: nft_table_builtin_find() is fast and therefore
a quick way to bail for uninteresting tables. The compatibility check is
needed for the remaining tables, only.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Make eb- and arptables-save print both header and footer comments, too.
Also print them for each table separately - the timing information is
worth the extra lines in output.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The initial problem was 'ebtables-save -c' printing iptables-style
counters but at the same time not disabling ebtables-style counter
output (which was even printed in wrong format for ebtables-save).
The code around counter output was complicated enough to motivate a
larger rework:
* Make FMT_C_COUNTS indicate the appended counter style for ebtables.
* Use FMT_EBT_SAVE to distinguish between '-c' style counters and the
legacy pcnt/bcnt ones.
Consequently, ebtables-save sets format to:
FMT_NOCOUNTS - for no counters
FMT_EBT_SAVE - for iptables-style counters
FMT_EBT_SAVE | FMT_C_COUNTS - for '-c' style counters
For regular ebtables, list_rules() always sets FMT_C_COUNTS
(iptables-style counters are never used there) and FMT_NOCOUNTS if no
counters are requested.
The big plus is if neither FMT_NOCOUNTS nor FMT_C_COUNTS is set,
iptables-style counters are to be printed - both in iptables and
ebtables. This allows to drop the ebtables-specific 'save_counters'
callback.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Don't hard-code program names. This also fixes for bogus 'xtables-save'
name which is no longer used.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The IPTABLES_VERSION C macro replicates the PACKAGE_VERSION C macro
(both have the same definition, "@PACKAGE_VERSION@"). Since
IPTABLES_VERSION, being located in internal.h, is not exposed to
downstream users in any way, it can just be replaced by
PACKAGE_VERSION, which saves a configure-time file substitution.
This goes towards eliminating unnecessary rebuilds after rerunning
./configure.
Signed-off-by: Jan Engelhardt <jengelh@inai.de>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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First of all, this error message should not appear on stdout, otherwise
it may end in dump files. Next, with completely empty ruleset, even
valid table names cause errors. To avoid this, continue operation if the
not found table is a builtin one.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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These definitions should be const, propagate this to all existing users.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Being able to omit the previously obligatory table name check when
iterating over the chain cache might help restore performance with large
rulesets in xtables-save and -restore.
There is one subtle quirk in the code: flush_chain_cache() did free the
global chain cache if not called with a table name but didn't if a table
name was given even if it emptied the chain cache. In other places,
chain_cache being non-NULL prevented a cache update from happening, so
this patch establishes the same behaviour (for each individual chain
cache) since otherwise unexpected cache updates lead to weird problems.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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arptables classic doesn't have arptables-save, it only has a perl
script that attempts to emulate iptables-save. It supports no options,
and thus has no way to dump counters. Add -c option, like iptables to
enable this.
Signed-off-by: Florian Westphal <fw@strlen.de>
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The 'original' ebtables-save was a perl script that supported no option.
Add minimal options, like ip(6)tables save.
Retain the old way of formatiing counters via environment variable,
but allow overriding this using the -c option.
Signed-off-by: Florian Westphal <fw@strlen.de>
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So we can remove nft_chain_dump() and replace nftnl_chain_get_list().
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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When running iptables-nft-save with other tables present, the dump
succeeded but the tool complained about those other tables. In an
environment where iptables-nft and nftables are uses in parallel, this
is an expected situation, so only complain about incompatible builtin
tables.
While being at it, move the table existence check from __do_output()
into do_output() since the former may be called from
nft_for_each_table() in which case the table is guaranteed to exist.
Also use nft_table_builtin_find() in nft_is_table_compatible() instead
of open-coding the search by name in h->tables.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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These fix reports for definitely lost blocks in valgrind. Not really
memleaks, but due to nft_handle going out of scope they're counted as
lost. Still worth fixing though since it reduces noise when auditing
code for real issues.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Mostly to reduce noise from valgrind output, add missing calls to
destroy iterators in nft.c and add cleanup for the populated nft_handle
in xtables_eb_save_main().
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This adds C implementations for arptables-save and -restore in compat
layer based on the two perl scripts in legacy arptables repository.
To share common code, introduce nft_init_arp() analogous to
nft_init_eb() introduced earlier.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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The code for ebtables-restore was derived from legacy code,
ebtables-save is actually a new implementation using the existing
infrastructure and trying to adhere to legacy perl script output
formatting as much as possible.
This introduces a new format flag (FMT_EBT_SAVE) to allow
nft_bridge_save_rule() to distinguish between ruleset listing (i.e.,
ebtables -L) and saving via ebtables-save - the two differ in how
counters are being formatted. Odd, but that's how it is.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Preparing ebtables-save implementation, allow for callers to pass format
bits to nft_rule_save() instead of just the 'counters' boolean.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Provide a hint that iptables isn't showing all rules because
its using nfnetlink rather than old set/getsockopt.
Signed-off-by: Florian Westphal <fw@strlen.de>
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-V now yields:
arptables vlibxtables.so.12 (nf_tables)
ebtables 1.6.2 (nf_tables)
ip6tables v1.6.2 (legacy)
ip6tables v1.6.2 (nf_tables)
ip6tables-restore v1.6.2 (nf_tables)
ip6tables-save v1.6.2 (nf_tables)
ip6tables-restore v1.6.2 (legacy)
ip6tables-restore-translate v1.6.2
ip6tables-save v1.6.2 (legacy)
ip6tables-translate v1.6.2 (nf_tables)
iptables v1.6.2 (legacy)
iptables v1.6.2 (nf_tables)
iptables-restore v1.6.2 (nf_tables)
iptables-save v1.6.2 (nf_tables)
iptables-restore v1.6.2 (legacy)
iptables-restore-translate v1.6.2
iptables-save v1.6.2 (legacy)
iptables-translate v1.6.2 (nf_tables)
This allows to see wheter "iptables" is using
old set/getsockopt or new nf_tables infrastructure.
Suggested-by: Harald Welte <laforge@gnumonks.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
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So we don't have to dump the chain cache content over and over again.
Moreover, perform incremental updates on the chain cache to add and to
delete non-base chains.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Use nft_is_table_compatible instead as only helper to a 'skip' decision.
Custom tables, tables that have extra base chains that iptables
syntax doesn't allow or rules that have special constructs line nftables
set lookups or verdict maps are not listed, but a message is provided
to show that such table exists.
Signed-off-by: Florian Westphal <fw@strlen.de>
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This is used by a followup patch to avoid continuing the 'dump everything
and then ignore what we don't need' model.
Places that know they only need a particular table
'iptables-save -t filter' can ask the kernel to limit this for us.
Signed-off-by: Florian Westphal <fw@strlen.de>
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This always uses xtables_ipv4 (which is same as _ipv6).
Pass the correct skeleton instead, this is needed to handle ebtables
correctly from xt-translate, as it doesn't use ip/ip6 tables.
Signed-off-by: Florian Westphal <fw@strlen.de>
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noticed that iptables-compat-save exits with 1 on success,
whereas iptables-compat-save -t filter returns 0 (as expected).
Caused by double-invert of return value, so ge rid of those.
do_output now returns a value suitable to pass to exit() or return from main.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Instead of not listing anything at all if an unknown table name
exists, just skip them. Output a small comment that the listing
doesn't include the (unrecognized, nft-created) tables.
Next patch will restrict 'is this table printable in
xtables syntax' check to the "builtin" tables.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Adds an option to output the results of iptables-save,
ip6tables-save, and xtables-save save to a file.
Updates the man page with this new option.
Uses the dup2 call to replace stdout with the specified file.
Error output is unchanged.
This is a feature requested by a Gentoo developer in
Bugzilla #905.
Signed-off-by: Oliver Ford <ojford@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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When an unknown option is given, iptables-restore should exit instead of
continue its operation. For example, if `--table` was misspelled, this
could lead to an unwanted change. Moreover, exit with a status code of
1. Make the same change for iptables-save.
OTOH, exit with a status code of 0 when requesting help.
Signed-off-by: Vincent Bernat <vincent@bernat.im>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds a verification of the compatibility between the nft
ruleset and iptables. Nft tables, chains and rules are checked to be
compatible with iptables. If something is not compatible, the execution
stops and an error message is displayed to the user.
This checking is triggered by xtables-compat -L and xtables-compat-save
commands.
Signed-off-by: Pablo M. Bermudo Garay <pablombg@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Adapt this code to use the new symbols in libnftnl. This patch contains quite
some renaming to reserve the nft_ prefix for our high level library.
Explicitly request libnftnl 1.0.5 at configure stage.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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On glibc, <sys/errno.h> is a synomym for <errno.h>.
<errno.h> is specified by POSIX, so use that.
Fixes compilation error with musl libc
Signed-off-by: Florian Westphal <fw@strlen.de>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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see also 296dca39be
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This fixes matches/targets that are dependent on that IPv4/Ipv6
context, eg.
# ip6tables-compat -I INPUT -j REJECT --reject-with icmp6-addr-unreachable
# ip6tables-compat-save
...
-A INPUT -j REJECT --reject-with icmp6-port-unreachable
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch should allow distributors to switch to the iptables over
nftables compatibility layer in a transparent way by updating
symbolic links from:
lrwxrwxrwx 1 root root 13 feb 4 15:35 iptables -> xtables-multi
to:
lrwxrwxrwx 1 root root 13 feb 4 15:35 iptables -> xtables-compat-multi
Same thing with iptables-save, iptables-restore, ip6tables, ip6tables-save,
ip6tables-restore and arptables.
Note that, after this patch, the following new symlinks are installed:
* iptables-compat
* iptables-compat-save
* iptables-compat-restore
* ip6tables-compat
* ip6tables-compat-save
* ip6tables-compat-restore
* arptables-compat
which point to the new binary xtables-compat-multi.
The idea is to keep both native and compatibility tools installed in the
system, which should also make it easier for testing purposes.
The iptables over nftables compatibility layer is enabled by default
and it requires the libmnl and libnftnl libraries. If you don't want to
compile the compatibility layer, you can still disable it through
--disable-nftables.
This patch also includes changes to adapt the existing code to this
approach.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Adapt the current code to use the new library name libnftnl.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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On xtables-save.c, -d will not output right away but after the full
command line hase been parsed.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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We need family dependent built-in table/chain configuration. This
patch is a step forward making nft family independent in
order to support arptables and ebtables compatibility layers.
Signed-off-by: Giuseppe Longo <giuseppelng@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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I noticed that the iprange match in IPv6 was broken, fix it
by overriding the default family (IPv4) if -6 is passed.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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