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The new structure nft_ctx is meant to be used as a generic container of
context information.
This is a preparatory patch. So at the moment the struct just carry
output_ctx on his path through main.c and cli.c.
Based on original idea from Eric Leblond.
Signed-off-by: Pablo M. Bermudo Garay <pablombg@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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libnftables library will be created soon. So declare numeric_output,
stateless_output, ip2name_output and handle_output as members of
structure output_ctx, instead of global variables. Rename these
variables as following,
numeric_output -> numeric
stateless_output -> stateless
ip2name_output -> ip2name
handle_output -> handle
Also add struct output_ctx *octx as member of struct netlink_ctx.
Signed-off-by: Varsha Rao <rvarsha016@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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If you load a file using the nested ruleset representation, ie. the one
you get via `nft list ruleset', error reporting doesn't help you much to
find the problem.
For example, the following ruleset points to an unexisting chain 'x':
table test {
chain test {
type filter hook ingress priority 0; policy drop;
ip saddr { 1.1.1.1, 2.2.2.2, 3.3.3.3, 4.4.4.4 } jump x
}
}
Error reporting is very sparse as it says:
# nft -f /home/test/x
/home/test/x:1:1-2: Error: Could not process rule: No such file or directory
table netdev test{
^^
So it's hard to know what is exactly missing.
This patch enhances the existing logic, so nft points to the rule
causing the problem, ie.
# nft -f /home/test/x
/home/test/x:4:17-70: Error: Could not process rule: No such file or directory
ip saddr { 1.1.1.1, 2.2.2.2, 3.3.3.3, 4.4.4.4 } jump x
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The idea behind this patch is to expand the single table command into a
list of individual commands, one per nested object inside the table.
This expanded list is spliced into the existing list of commands. Thus,
each command gets a sequence number that helps us correlate the error
with the command that triggers it.
This patch also includes reference counting for rules and objects. This
was already in place for table, chain and sets. We need this since now
we hold references to them from both the command and the table object
itself. So the last reference releases the object from memory. Note that
table objects still keep the list of chain, sets, etc. since the
existing cache logic needs this to work.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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If no explicit relative or absolute path is enforced by the user, nft
relies on either -I/--includepath or the default include directory that
is set at compile time.
Given most of our users will rely on packaged versions of nft, provide a
way to display the location of this default includepath directory.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The underlying mnl layer uses a global nftnl_batch structure. Instead,
pass pointer as parameter to the functions that need this. The netlink
layer stores a reference to this structure in struct netlink_ctx.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The number of numeric options influences the behavior and the user
should be warned if a invalid number is used.
Signed-off-by: Elise Lennion <elise.lennion@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Always print flow statement as stateless expressions, given that this
just defines the flow table statement instance that is allocated per
entry.
Signed-off-by: Elise Lennion <elise.lennion@gmail.com>
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Currently only counter and quota have stateful information.
For named counters, packets and bytes are displayed as 0.
Standard list ruleset:
table ip filter {
counter https {
packets 161942 bytes 10253353
}
chain output {
type filter hook output priority 0; policy accept;
counter name tcp dport map { https : "https"}
tcp dport https counter packets 171211 bytes 10869045
tcp dport https quota 25 mbytes used 10 mbytes
}
}
With stateless option, -s:
table ip filter {
counter https {
packets 0 bytes 0
}
chain output {
type filter hook output priority 0; policy accept;
counter name tcp dport map { https : "https"}
tcp dport https counter
tcp dport https quota 25 mbytes
}
}
Signed-off-by: Elise Lennion <elise.lennion@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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"When used twice" was used twice in the manpage. :)
And as Florian Westphal pointed out, it was also incorrect
for the -nn case.
Update the manpage and built-in help in main.c to match actual behavior.
Signed-off-by: Jon Jensen <jon@endpoint.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
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This patch adds the missing bits to scan and parse the meta priority
handle as expressed by tc classid major:minor syntax.
The :minor syntax is not support for two reason: major is always >= 1
and this clashes with port syntax in nat.
Here below, several example on how to match the packet priority field:
nft add rule filter forward meta priority abcd:0
nft add rule filter forward meta priority abcd:1234
and to set it, you have to:
nft add rule filter forward meta priority set abcd:1234
The priority expression in flex looks ahead to restrict the pattern to
avoid problems with mappings:
{classid}/[ \t\n:\-},]
So the following doesn't break:
... vmap { 25:accept }
^^^^^
The lookahead expression requires a slight change to extend the input
string in one byte.
This patch is conservative as you always have to explicity indicate
major and minor numbers even if zero.
We could consider supporting this shortcut in the future:
abcd:
However, with regards to this:
:abcd
We don't need to support it since major number is assumed to be >= 1.
However, if we ever decide to support this, we'll have problems since
this clashes with our port representation in redirect and mangle.
So let's keep this simple and start with this approach.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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We get a partial cache (tables, chains and sets) when:
* We see a set reference from a rule, since this set object may be
already defined in kernelspace and we need to fetch the datatype
for evaluation.
* We add/delete a set element, we need this to evaluate if the
element datatype is correct.
* We rename a chain, since we need to know the chain handle.
* We add a chain/set. This isn't needed for simple command line
invocations. However, since the existing codepath is also exercised
from `nft -f' context, we need to know if the object exists in the
kernel. Thus, if this a newly declared object (not yet in the kernel) we
add it to the cache, otherwise, we will not find follow up references to
this object in our cache.
We get a full cache when:
* We list the ruleset. We can provide finer grain listing though,
via partial cache, later.
* We monitor updates, since this displays incremental updates based on
the existing objects.
* We export the ruleset, since this dumps all of the existing objects.
* We push updates via `nft -f'. We need to know what objects are
already in the kernel for incremental updates. Otherwise,
cache_update() hits a bogus 'set doesn't exist' error message for
just declared set in this batch. To avoid this problem, we need a
way to differentiate between what objects in the lists that are
already defined in the kernel and what are just declared in this
batch (hint: the location structure information is set for just
declared objects).
We don't get a cache at all when:
* We flush the ruleset, this is important in case of delinearize
bugs, so you don't need to reboot or manually flush the ruleset via
libnftnl examples/nft-table-flush.
* We delete any object, except for set elements (as we describe above).
* We add a rule, so you can generate via --debug=netlink the expression
without requiring a table and chain in place.
* We describe a expression.
This patch also includes some intentional adjustments to the shell tests
to we don't get bogus errors due to changes in the list printing.
BTW, this patch also includes a revert for 97493717e738 ("evaluate: check
if table and chain exists when adding rules") since that check is not
possible anymore with this logic.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Replaced '/' between shortopt and longopt with ',' , as used by other utilities.
Signed-off-by: Piyush Pangtey <gokuvsvegita@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The only remaining caller that needs this is netlink_dump_ruleset(), that is
used to export the ruleset using markup representation. We can remove it and
handle this from do_command_export() now that we have a centralized point to
build up the object cache.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch introduces the generic object cache that is populated during the
evaluation phase.
The first client of this infrastructure are table objects. As a result, there
is a single call to netlink_list_tables().
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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# nft add chain filter input { type filter hook inputt priority 0\; }
<cmdline>:1:43-48: Error: unknown chain hook inputt
add chain filter input { type filter hook inputt priority 0; }
^^^^^^
Before:
# echo $?
0
After:
# echo $?
1
Note that nft_parse() returns 1 on parsing errors and 0 + state->errs on
evaluation problems, so return -1 as other functions do here to pass up the
error to the main routine.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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nftables used to have a cache to speed up interface name <-> index lookup,
restore it using libmnl.
This reduces netlink traffic since if_nametoindex() and if_indextoname() open,
send a request, receive the list of interface and close a netlink socket for
each call. I think this is also good for consistency since nft -f will operate
with the same index number when reloading the ruleset.
The cache is populated by when nft_if_nametoindex() and nft_if_indextoname()
are used for first time. Then, it it released in the output path. In the
interactive mode, it is invalidated after each command.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1000
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Needed by follow up patches to use autotools.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch changes the default behaviour of nft to not translate IP
addresses to hostnames when printing rules if no options are passed.
The options regarding translations after this patch are:
<no -n/-N> show IP addresses numerically (default behaviour)
-n show IP addresses numerically
-nn show Internet services and uid/gid numerically
-nnn show protocols numerically
-N (--reversedns) translate IP addresses to names
The idea is to avoid breaking existing scripts that most likely rely on
'-n' to save the ruleset, so we reduce the impact of this patch and
provide a default behaviour that doesn't generate network traffic when
listing / saving the ruleset.
Joint work with Pablo.
Suggested-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This makes nftables a bit more embedded-friendly.
Signed-off-by: Steven Barth <cyrus@openwrt.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Obtain the generation ID before dumping the object lists. Then,
check for generation ID updates when dumping the several lists that
this needs. In case of interference, nft has to remove the stale
objects and retry from scratch.
This is complementary to the NLM_F_DUMP_INTR flag which is local
to one single netlink dump.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Before:
# nft add rule ip test input ip hdrlength 3
<cmdline>:1:1-37: Error: Could not process rule: Invalid argument
add rule ip test input ip hdrlength 3
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
# echo $?
0
After:
# nft add rule ip test input ip hdrlength 3
<cmdline>:1:1-37: Error: Could not process rule: Invalid argument
add rule ip test input ip hdrlength 3
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
# echo $?
1
Reported-by: Ana Rey Botello <anarey@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch reworks the batching logic in several aspects:
1) New batch pages are now always added into the batch page list in
first place. Then, in the send path, if the last batch page is
empty, it is removed from the batch list.
2) nft_batch_page_add() is only called if the current batch page is
full. Therefore, it is guaranteed to find a valid netlink message
in the batch page when moving the tail that didn't fit into a new
batch page.
3) The batch paging is initialized and released from the nft_netlink()
path.
4) No more global struct mnl_nlmsg_batch *batch that points to the
current batch page. Instead, it is retrieved from the tail of the
batch list, which indicates the current batch page.
This patch fixes a crash due to access of uninitialized memory area in
due to calling batch_page_add() with an empty batch in the send path,
and the memleak of the batch page contents. Reported in:
http://patchwork.ozlabs.org/patch/367085/
http://patchwork.ozlabs.org/patch/367774/
The patch is larger, but this saves the zeroing of the batch page area.
Reported-by: Yanchuan Nian <ycnian@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This flag allows to detect that an update has ocurred while dumping
any of the object lists. In case of interference, nft cancels the
netlink socket to skip processing the remaining stale entries and
it retries to obtain fresh list of objects.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch moves the netlink set messages to the batch that contains
the rules. This helps to speed up rule-set restoration time by
changing the operational. To achieve this, an internal set ID which
is unique to the batch is allocated as suggested by Patrick.
To retain backward compatibility, nft initially guesses if the
kernel supports set in batches. Otherwise, it falls back to the
previous (slowier) operational.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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We currently do parsing and evaluation in two seperate stages. This means
that if any error occurs during parsing, we won't evaluate the syntactical
correct commands and detect possible evaluation errors in them.
In order to improve error reporting, change this to evaluate every command
as soon as it is fully parsed.
With this in place, the ruleset can be fully validated and all errors
reported in one step:
tests/error.1:6:23-23: Error: syntax error, unexpected newline
filter input tcp dport
^
tests/error.1:7:24-26: Error: datatype mismatch, expected internet network service, expression has type Internet protocol
filter input tcp dport tcp
~~~~~~~~~ ^^^
tests/error.1:8:24-32: Error: Right hand side of relational expression (==) must be constant
filter input tcp dport tcp dport
~~~~~~~~~~^^^^^^^^^
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Move error recovery to the common_block definition to handle errors
in any block. Queue those errors and abort parsing once a threshold
is reached.
With this in place, we can continue parsing when errors occur and
show all of them to the user at once.
tests/error.1:3:8-8: Error: syntax error, unexpected '{', expecting string
filter {
^
tests/error.1:4:13-13: Error: syntax error, unexpected newline
filter input
^
tests/error.1:5:17-17: Error: syntax error, unexpected newline
filter input tcp
^
tests/error.1:6:23-23: Error: syntax error, unexpected newline
filter input tcp dport
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Signed-off-by: Patrick McHardy <kaber@trash.net>
Conflicts:
include/nftables.h
src/main.c
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This allows you to dump the netlink message that is send via
libmnl.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Patrick McHardy <kaber@trash.net>
Conflicts:
include/nftables.h
src/main.c
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Currently, nft displays the debugging information if it's compiled with
--enable-debug (which seems a good idea) and when intervals are used
in maps. Add a new option to enable debugging to segtree, so we only
get this information when explicitly requested.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Remove the "in batch" part, it makes most messages exceed a single line, the
user doesn't care about this and we process even single rules in "batches".
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Introduction of batch support broke displaying of EPERM since those are
generated by the kernel before batch processing starts and thus have the
sequence number of the NFNL_MSG_BATCH_BEGIN message instead of the
command messages. Also only a single error message is generated for the
entire batch.
This patch fixes this by noting the batch sequence number and displaying
the error for all commands since this is what would happen if the
permission check was inside batch processing as every other check.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Add a new debugging level to debug updates to the protocol context.
Sample output:
<cmdline>:1:15-23: Evaluate
filter output tcp dport ssh
^^^^^^^^^
tcp
update transport layer protocol context:
link layer : none
network layer : ip
transport layer : tcp <-
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Exit with NFT_EXIT_FAILURE if something went wrong in the netlink code.
Before this patch:
internal:0:0-0: Error: Could not find chain `asd' in table `filter': [...]
0
After this patch:
internal:0:0-0: Error: Could not find chain `asd' in table `filter': [...]
1
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch allows nft to put all rule update messages into one
single batch that is sent to the kernel if `-f' option is used.
In order to provide fine grain error reporting, I decided to
to correlate the netlink message sequence number with the
correspoding command sequence number, which is the same. Thus,
nft can identify what rules trigger problems inside a batch
and report them accordingly.
Moreover, to avoid playing buffer size games at batch building
stage, ie. guess what is the final size of the batch for this
ruleset update will be, this patch collects batch pages that
are converted to iovec to ensure linearization when the batch
is sent to the kernel. This reduces the amount of unnecessary
memory usage that is allocated for the batch.
This patch uses the libmnl nlmsg batching infrastructure and it
requires the kernel patch entitled (netfilter: nfnetlink: add batch
support and use it from nf_tables).
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Personally, I like seeing ports and IPs numerically, but prefer protocols
to be shown by name. As such, add a third --numeric level which will
show protocols by number, splitting them out from ports.
-n/--numeric When specified once, show network addresses numerically.
When specified twice, also show Internet services,
user IDs and group IDs numerically.
When specified thrice, also show protocols numerically.
Signed-off-by: Phil Oester <kernel@linuxace.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Knowing the rule handle is necessary to be able to delete a single
rule. It was not displayed till now in the output and it was thus
impossible to remove a single rule.
This patch modify the listing output to add a comment containing
the handle when the -a/--handle flag is provided.
Signed-off-by: Eric Leblond <eric@regit.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds missing code to get basic interactive mode
operative via `nft -i', including parsing, evaluation,
command execution via netlink and error reporting.
Autocomplete is not yet implemented.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Now it displays:
nft -f wrong_file
internal:0:0-0: Error: Could not open file "wrong_file": No such file or directory
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The bison parser returns 0 in case of success and it returns 1 in
case of error.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Trivial patch which fixes typo.
Signed-off-by: Romain Bignon <romain@peerfuse.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Fixes strange error messages like:
In file included from internal:0:0-0:
files/examples/sets_and_maps:55:2-2: Error: syntax error, unexpected newline, expecting string
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Signed-off-by: Patrick McHardy <kaber@trash.net>
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Signed-off-by: Patrick McHardy <kaber@trash.net>
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Free nested chain handles and command structures when done.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Properly release the user-defined symbols.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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