| Commit message (Collapse) | Author | Age | Files | Lines |
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This is needed to merge with xtables-arp which has more builtin
options and hence needs more bits in invflags.
The only adjustment needed is the set_option() call for option '-j'
which passed a pointer to cs->fw.ip.invflags. That field can't be
changed, it belongs to uAPI. Though using args->invflags instead works
fine, aside from that '-j' doesn't support inverting so this is merely a
sanity check and no real invflag value assignment will happen.
Signed-off-by: Phil Sutter <phil@nwl.cc>
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Just like with class-based prefix matches in iptables-nft, optimize
masked MAC address matches if the mask is on a byte-boundary.
To reuse the logic in add_addr(), extend it to accept the payload base
value via parameter.
Signed-off-by: Phil Sutter <phil@nwl.cc>
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Payload expression works on byte-boundaries, leverage this with suitable
prefix lengths.
Signed-off-by: Phil Sutter <phil@nwl.cc>
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When called with --verbose mode, iptables-nft-restore did not print
anything when flushing the table. Fix this by adding a "manual" mode to
nft_cmd_table_flush(), turning it into a wrapper around '-F' and '-X'
commands, which is exactly what iptables-legacy-restore does to flush a
table. This though requires a real cache, so don't set NFT_CL_FAKE then.
Signed-off-by: Phil Sutter <phil@nwl.cc>
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All families use the same callback function, just fold it into the sole
place it's called.
Signed-off-by: Phil Sutter <phil@nwl.cc>
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Both ebtables and arptables are fine with using nft_ipv46_rule_find()
instead of their own implementations. Take the chance and move the
former into nft.c as a static helper since it is used in a single place,
only. Then get rid of the callback from family_ops.
Signed-off-by: Phil Sutter <phil@nwl.cc>
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This patch updates the parser to generate a list of command objects.
This list of commands is then transformed to a list of netlink jobs.
This new command object stores the rule using the nftnl representation
via nft_rule_new().
To reduce the number of updates in this patch, the nft_*_rule_find()
functions have been updated to restore the native representation to
skip the update of the rule comparison code.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Phil Sutter <phil@nwl.cc>
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Add required glue code to support family specific lookup expression
parsers implemented as family_ops callback.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Down to the point where expression parsing happens, the rule's table is
not known anymore but relevant if set lookups are required.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Allow for closer inspection by storing payload expression's base and
length values. Also facilitate for two consecutive payload expressions
as LHS of a (cmp/lookup) statement as used with concatenations.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Instead of carrying the family value, carry the handle (which contains
the family value) and relieve expression parsers from having to call
nft_family_ops_lookup().
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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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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Prepare for 'rule_to_cs' callback to receive nft_handle pointer so it is
able to access cache for set lookups.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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In order to prepare for rules containing set references, nft handle has
to be passed to nft_rule_to_iptables_command_state() in order to let it
access the set in cache.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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In order for add_match() to create anonymous sets when converting
xtables matches it needs access to nft handle. So pass it along from
callers of family ops' add callback.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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There's really no point in passing those as separate parameter. While
being at it, make them static const everywhere.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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They are mostly identical, just xtables-arp ones differ slightly. Though
since they are internal use only and their actual value doesn't matter
(as long as it's a distinct bit), they can be merged anyway.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Since commit 0baa08fed43fa ("xtables: unify user chain add/flush for
restore case") it is not used anymore, so just drop it.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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There is no need for dynamic callback mangling, so make all instances
static const.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Instead of setting newargv[0] to argv[0]'s value, just use whatever
xt_params->program_name contains. The latter is arbitrarily defined, but
may still be more correct than real argv[0] which may simply be for
instance xtables-nft-multi. Either way, there is no practical
significance since newargv[0] is used exclusively in debug output.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This structure contains restore parser configuration, parser is not
supposed to alter it.
Suggested-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Type used for 'mask' and 'xor' parameters was wrong, 'int' is four bytes
on 32 or 64 bit architectures. After casting a uint16_t to int, on Big
Endian the first two bytes of data are (the leading) zero which libnftnl
then copies instead of the actual value.
This problem was noticed when using '--fragment' option:
| # iptables-nft -A FORWARD --fragment -j ACCEPT
| # nft list ruleset | grep frag-off
| ip frag-off & 0 != 0 counter packets 0 bytes 0 accept
With this fix in place, the resulting nft rule is correct:
| ip frag-off & 8191 != 0 counter packets 0 bytes 0 accept
Fixes: 2f1fbab671576 ("iptables: nft: add -f support")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The idea here is to move the 'flush' decision into the core, rather than
have the decision in the frontend.
This will be required later when "generation id" is passed to kernel.
In this case, we might have to add the flush when re-trying the
transaction.
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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There is no need to "delete" (actually, remove from cache) a chain if
noflush wasn't given: While handling the corresponding table line,
'table_flush' callback has already taken care of that.
This .chain_del indirection is not required since d1eb4d587297
("iptables-compat: chains are purge out already from table flush").
Streamlining the code further, move syntax checks to the top. If these
concede, there are three cases to distinguish:
A) Given chain name matches a builtin one in current table, so assume it
exists already and just set policy and counters.
B) Noflush was given and the (custom) chain exists already, flush it.
C) Custom chain was either flushed (noflush not given) or didn't exist
before, create it.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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no more external callers.
Signed-off-by: Florian Westphal <fw@strlen.de>
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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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When aligning iptables-nft error messages with legacy ones, I missed
that translate tools shouldn't check for missing or duplicated chains.
Introduce a boolean in struct nft_xt_cmd_parse indicating we're "just"
translating and do_parse() should skip the checks.
Fixes: b6a06c1a215f8 ("xtables: Align return codes with legacy iptables")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Move the function to xshared.c for common use between legacy and xtables
sources. While being at it, silence a covscan warning triggered by that
function as it couldn't verify input buffers won't exceed IFNAMSIZ.
Therefore use snprintf() when writing to the local buffer.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Use of payload expression to match against IPv6 nexthdr field does not
work if extension headers are present. A simple example for that is
matching for fragmented icmpv6 traffic. Instead, generate a 'meta
l4proto' expression which works even if extension headers are present.
For consistency, apply the same change to iptables-nft as well.
No adjustment to reverse path required as the needed bits were added by
commit 6ea7579e6fe24 ("nft: decode meta l4proto") already.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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The previous fix for reference counts in iptables-nft output wasn't
complete: While iptables lists the number of references for each custom
chain (i.e., the number of jumps to it), ebtables lists number of
entries (i.e., the number of rules contained) for each chain. Both used
the same value for it, although they are different metrics.
Fix this by passing both numbers separately to the 'print_header'
callback so that each tool may print the desired value.
Fixes: a0698de9866d2 ("xtables: Do not count rules as chain references")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Legacy iptables uses '-c PCNT BCNT' format in listed rules, nft-variant
used '[PCNT BCNT]' prefix like with iptables-save.
In order to pass the counter format preference along, FMT_C_COUNTS is
introduced and related 'format' checks adjusted.
Since legacy iptables prints the counters between matches and target,
this change affects save_matches_and_target() function. In order to get
access to the rule counters, it's declaration is adjusted to receive
iptables_command_state pointer instead of match, target and jumpto
pointers from the same object.
While being at it, integrate jump to user-defined chain into it as well
since the related code in both callers was almost identical. Though
since different rule flags are used between iptables and ip6tables, pass
a 'goto_flag' boolean instead of the actual 'flags' bitfield.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Legacy ebtables-restore does not support COMMIT directive, so allow for
callers of xtables_restore_parse() to toggle whether it is required or
not.
In iptables, omitting COMMIT may be used for syntax checking, so we must
not add an implicit commit at EOF. Although ebtables/arptables legacy
does not support COMMIT lines at all, this patch allows them in nft
variants. If omitted, an implicit commit happens for them at EOF.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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This debug printing macro was defined in various places, always
identical. Move it into xshared.h and drop it from sources including
that header. There are a few exceptions:
* iptables-xml.c did not include xshared.h, which this patch changes.
* Sources in extensions and libiptc mostly left alone since they don't
include xshared.h (and maybe shouldn't). Only libxt_set.h does, so
it's converted, too.
This also converts DEBUG define use in libip6t_hbh.c to avoid a compiler
warning.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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In preparation for ebtables-save implementation, introduce a callback
for convenient per-family formatting of chains in save output.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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The name is quite misleading, since these functions/callbacks are not
about the whole ruleset but just a single rule. So rename them to
reflect this.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Just replace them by the shared save_counters() function after adjusting
it's signature to meet callback requirements.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Both functions just pass their parameters 1:1 to nft_ipv46_rule_find, so
replace them by the latter after minor adjustment to match expected
callback signature.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Both functions are identical, replace them by a common one in
nft-shared.c.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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This introduces callbacks in nft_family_ops for parsing an nftnl rule
into iptables_command_state and clearing it afterwards.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Replace union 'state' by its sole member.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Differences between both structs are marginal (apart from
arptables_command_state being much smaller), so merge them into one.
Struct iptables_command_state is already shared between iptables,
ip6tables and ebtables.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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nft meta expr enables the nfnetlink based trace infrastruvture, so
prefer to use that rather than xt_TRACE.
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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Use iptables_command_state instead.
This allows to re-use code from the ip(6)tables layer and
reduces cop&pasted code.
Signed-off-by: Florian Westphal <fw@strlen.de>
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-n still flushes user-defined chains and its content, the following snippet:
iptables-compat -N FOO
iptables-compat -I INPUT
iptables-compat -I FOO
iptables-compat -I FOO
iptables-compat-save > A
iptables-compat-restore < A
iptables-compat -N BAR
iptables-compat -A BAR
iptables-compat-restore -n < A
results in:
iptables-compat-save
# Generated by xtables-save v1.6.2 on Mon May 7 17:18:44 2018
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:BAR - [0:0]
:FOO - [0:0]
-A INPUT
-A INPUT
-A BAR
-A FOO
-A FOO
COMMIT
# Completed on Mon May 7 17:18:44 2018
Still, user-defined chains that are not re-defined, such as BAR, are
left in place.
Reported-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Remove dead code that uses the ancient non-batch netlink API. Chains
are already purged out from table flush.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The following snippet fails if user chain FOO exists, but it should not fail:
iptables-compat -F
iptables-compat -N FOO
iptables-compat-save > foo
iptables-compat-restore < foo
Reported-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Florian Westphal <fw@strlen.de>
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avoids a compiler warning in a followup patch.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Use a more generic name for this object to prepare the introduction of
other translation specific fields.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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