| Commit message (Collapse) | Author | Age | Files | Lines |
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It only works if vlan_reorder is turned off to disable the vlan tag
removal.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Fix a couple of spelling mistakes:
'expresion' -> 'expression'
and correct some non-native usages:
'allows to' -> 'allows one to'
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Add missing documentation for nft_ctx_add_var() and nft_ctx_clear_vars()
functions.
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Packet-based limit burst is set to 5, as in iptables. However,
byte-based limit burst adds to the rate to calculate the bucket size,
and this is also sets this to 5 (... bytes in this case). Update it to
use zero byte burst by default instead.
This patch also updates manpage to describe how the burst value
influences the kernel module's token bucket in each of the two modes.
This documentation update is based on original text by Phil Sutter.
Adjust tests/py to silence warnings due to mismatching byte burst.
Fixes: 285baccfea46 ("src: disallow burst 0 in ratelimits")
Acked-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Originally a typo in fixed commit: It added 't' in lower case, but
meanwhile '-t' was added as well.
Fixes: f8f32deda31df ("meta: Introduce new conditions 'time', 'day' and 'hour'")
Signed-off-by: Phil Sutter <phil@nwl.cc>
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Point at a possible solution to match IPsec info of locally generated
traffic routed to an xfrm-type interface.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
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This allows to replace a tcp option with nops, similar
to the TCPOPTSTRIP feature of iptables.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Signed-off-by: Florian Westphal <fw@strlen.de>
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This patch adds a new -o/--optimize option to enable ruleset
optimization.
You can combine this option with the dry run mode (--check) to review
the proposed ruleset updates without actually loading the ruleset, e.g.
# nft -c -o -f ruleset.test
Merging:
ruleset.nft:16:3-37: ip daddr 192.168.0.1 counter accept
ruleset.nft:17:3-37: ip daddr 192.168.0.2 counter accept
ruleset.nft:18:3-37: ip daddr 192.168.0.3 counter accept
into:
ip daddr { 192.168.0.1, 192.168.0.2, 192.168.0.3 } counter packets 0 bytes 0 accept
This infrastructure collects the common statements that are used in
rules, then it builds a matrix of rules vs. statements. Then, it looks
for common statements in consecutive rules which allows to merge rules.
This ruleset optimization always performs an implicit dry run to
validate that the original ruleset is correct. Then, on a second pass,
it performs the ruleset optimization and add the rules into the kernel
(unless --check has been specified by the user).
From libnftables perspective, there is a new API to enable
this feature:
uint32_t nft_ctx_get_optimize(struct nft_ctx *ctx);
void nft_ctx_set_optimize(struct nft_ctx *ctx, uint32_t flags);
This patch adds support for the first optimization: Collapse a linear
list of rules matching on a single selector into a set as exposed in the
example above.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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tcp option <foo> kind ... never makes any sense, as "tcp option <foo>"
already tells the kernel to look for the foo <kind>.
"tcp option sack kind 5" matches if the sack option is present; its a
more complicated form of the simpler "tcp option sack exists".
"tcp option sack kind 1" (or any other value than 5) will never match.
So remove this.
Test cases are converted to "exists".
Signed-off-by: Florian Westphal <fw@strlen.de>
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docs are too terse and did not have the list of valid timeout states.
While at it, adjust default stream timeout of udp to 120, this is the
current kernel default.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Add userspace support for the netdev egress hook which is queued up for
v5.16-rc1, complete with documentation and tests. Usage is identical to
the ingress hook.
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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- Add missing comma between array elements.
- Fix chain 'name' property.
- Match 'op' property is mandatory.
Fixes: 2e56f533b36a ("doc: Improve example in libnftables-json(5)")
Fixes: 90d4ee087171 ("JSON: Make match op mandatory, introduce 'in' operator")
Signed-off-by: Štěpán Němec <snemec@redhat.com>
Signed-off-by: Phil Sutter <phil@nwl.cc>
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Synopsis is not complete. Add examples for counters and quotas.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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nfnetlink_log uses netlink unicast to send logs to one single process in
userspace.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Refer to the ulogd daemon in the log statement section.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Duncan Roe <duncan_roe@optusnet.com.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Add NFT_CTX_OUTPUT_NUMERIC_SYMBOL to libnftables.adoc to keep it in sync
with the nftables/libnftables.h header.
Fixes: 685a06447ee4 ("doc: libnftables.adoc misc cleanups")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Print queue statement using the 'queue ... to' syntax to consolidate the
syntax around Florian's proposal introduced in 6cf0f2c17bfb ("src:
queue: allow use of arbitrary queue expressions").
Retain backward compatibility, 'queue num' syntax is still allowed.
Update and add new tests.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The kernel already assumes that that ICMP type to reject a packet is
destination-unreachable, hence the user specifies the *ICMP code*.
Simplify the syntax to:
... reject with icmp port-unreachable
this removes the 'type' keyword before the ICMP code to reject the
packet with.
IIRC, the original intention is to leave room for future extensions that
allow to specify both the ICMP type and the ICMP code, this is however
not possible with the current inconsistent syntax.
Update manpages which also refer to ICMP type.
Adjust tests/py to the new syntax.
Fixes: 5fdd0b6a0600 ("nft: complete reject support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds a new option to define variables from the command line.
# cat test.nft
table netdev x {
chain y {
type filter hook ingress devices = $dev priority 0;
counter accept
}
}
# nft --define dev="{ eth0, eth1 }" -f test.nft
You can only combine it with -f/--filename.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This allows to chose a queue number at run time using map statements,
e.g.:
queue flags bypass to ip saddr map { 192.168.7/24 : 0, 192.168.0/24 : 1 }
Signed-off-by: Florian Westphal <fw@strlen.de>
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back in 2016 Liping Zhang added support to kernel and libnftnl to
specify a source register containing the queue number to use.
This was never added to nft itself, so allow this.
On linearization side, check if attached expression is a range.
If its not, allocate a new register and set NFTNL_EXPR_QUEUE_SREG_QNUM
attribute after generating the lowlevel expressions for the kernel.
On delinarization we need to check for presence of
NFTNL_EXPR_QUEUE_SREG_QNUM and decode the expression(s) when present.
Also need to do postprocessing for STMT_QUEUE so that the protocol
context is set correctly, without this only raw payload expressions
will be shown (@nh,32,...) instead of 'ip ...'.
Next patch adds test cases.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Signed-off-by: Florian Westphal <fw@strlen.de>
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the CFI bit has been repurposed as DEI "Drop Eligible Indicator"
since 802.1Q-2011.
The vlan cfi field is still retained for compatibility.
Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1516
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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mention various 'nft list' options, such as secmarks, flow tables, and
so on.
Signed-off-by: Florian Westphal <fw@strlen.de>
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This is a singleton ct key, move it to where it belongs to.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Instead of:
ct count 2 accept
^^
simply print:
ct count 2 accept
While at it, add incomplete reference 'ct count' to manpage.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Quoting Duncan Roe:
Tiny nit: suggest "by a unique" instead of "by an unique".
"a" reads better to this native en-GB speaker at least.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Briefly describe 'nft monitor trace' command functionality.
Signed-off-by: Phil Sutter <phil@nwl.cc>
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This patch adds documentation for cgroupsv2 support.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Extend exthdr expression to support scanning through SCTP packet chunks
and matching on fixed fields' values.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Florian Westphal <fw@strlen.de>
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Introduce non-terminals representing address and port which may
represent ranges as well. Combined with dropping the distinction between
PR_FLAGS and PRF_FLAGS, all the lines for each nat statement type can be
combined.
Signed-off-by: Phil Sutter <phil@nwl.cc>
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ct state are flags, no need to define a set for this.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This replaces the numbers with the matching symbolic names with one
exception: The NAT example used "priority 0" for the prerouting
priority. This is replaced by "dstnat" which has priority -100 which is
the new recommended priority.
Also use spaces instead of tabs for consistency in lines which require
updates.
Signed-off-by: Simon Ruderich <simon@ruderich.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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At first I overlooked the "drop". Putting it on a separate line makes it
more visible and also details the separate steps of this rule.
Signed-off-by: Simon Ruderich <simon@ruderich.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The "outcome ruleset" is the same as the two tables in the example.
Don't duplicate this information which just wastes space in the
documentation and can confuse the reader (it took me a while to realize
the tables are the same).
In addition, use the same table name for both tables to make it clear
that they can be the same. They will be merged in the resulting ruleset.
Signed-off-by: Simon Ruderich <simon@ruderich.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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"/etc/firewall/rules/" causes no error but also doesn't include any
files contained in the directory.
Signed-off-by: Simon Ruderich <simon@ruderich.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Trying to escape asciidoc (9.1.0) * with \ preserves the backslash in
the formatted man page. Bare * works as expected.
Signed-off-by: Štěpán Němec <snemec@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The ratelimiter in nftables is similar to the one in iptables, and
iptables disallows a zero burst.
Update the byte rate limiter not to print burst 5 (default value).
Update tests/py payloads to print burst 5 instead of zero when the
burst is unspecified.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Add a description of dccp_pkttype and extend DCCP header expression
synopsis by the 'type' argument.
Signed-off-by: Phil Sutter <phil@nwl.cc>
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tcp option @42,16,4 (@kind,offset,length).
Signed-off-by: Florian Westphal <fw@strlen.de>
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'nop' is the tcp padding "option". "noop" is retained for compatibility
on parser side.
Signed-off-by: Florian Westphal <fw@strlen.de>
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tcpopt template mapping is asymmetric:
one mapping is to match dumped netlink exthdr expression to the original
tcp option template.
This struct is indexed by the raw, on-write kind/type number.
The other mapping maps parsed options to the tcp option template.
Remove the latter. The parser is changed to translate the textual
option name, e.g. "maxseg" to the on-wire number.
This avoids the second mapping, it will also allow to more easily
support raw option matching in a followup patch.
Signed-off-by: Florian Westphal <fw@strlen.de>
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One was added by the tcp option parsing ocde, the other by synproxy.
So we have:
synproxy ... sack-perm
synproxy ... mss
and
tcp option maxseg
tcp option sack-permitted
This kills the extra tokens on the scanner/parser side,
so sack-perm and sack-permitted can both be used.
Likewise, 'synproxy maxseg' and 'tcp option mss size 42' will work too.
On the output side, the shorter form is now preferred, i.e. sack-perm
and mss.
Signed-off-by: Florian Westphal <fw@strlen.de>
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The example adds a rule to the `output` chain, not the `input` chain.
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Available since Linux kernel >= 5.10.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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this updates the two examples in the man page that use the obsolete `meter` to
use sets. I also fixed a bit of formatting for the conntrack expressions.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Balazs Scheidler <bazsi77@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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It has been reported that nft options are a bit chaotic. With a growing list of options for the nft
CLI, we can do better when presenting them to the user who requests help.
This patch introduces a textual output grouping for options, in 4 groups:
* Options (general) -- common Unix utility options
* Options (operative) -- the options that modify the operative behaviour of nft
* Options (translation) -- output text modifiers for data translation
* Options (parsing) -- output text modifiers for parsing and other operations
There is no behavior change in this patch, is mostly a cosmetic change in the hope that users will
find the nft tool a bit less confusing to use.
After this patch, the help output is:
=== 8< ===
% nft --help
Usage: nft [ options ] [ cmds... ]
Options (general):
-h, help Show this help
-v, version Show version information
-V Show extended version information
Options (ruleset input handling):
-f, file <filename> Read input from <filename>
-i, interactive Read input from interactive CLI
-I, includepath <directory> Add <directory> to the paths searched for include files. Defaul[..]
-c, check Check commands validity without actually applying the changes.
Options (ruleset list formatting):
-a, handle Output rule handle.
-s, stateless Omit stateful information of ruleset.
-t, terse Omit contents of sets.
-S, service Translate ports to service names as described in /etc/services.
-N, reversedns Translate IP addresses to names.
-u, guid Print UID/GID as defined in /etc/passwd and /etc/group.
-n, numeric Print fully numerical output.
-y, numeric-priority Print chain priority numerically.
-p, numeric-protocol Print layer 4 protocols numerically.
-T, numeric-time Print time values numerically.
Options (command output format):
-e, echo Echo what has been added, inserted or replaced.
-j, json Format output in JSON
-d, debug <level [,level...]> Specify debugging level (scanner, parser, eval, netlink, mnl, p[..]
=== 8< ===
While at it, refresh the man page to better reflex this new grouping, and add some missing options.
Joint work with Pablo.
Signed-off-by: Arturo Borrero Gonzalez <arturo@netfilter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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