| Commit message (Collapse) | Author | Age | Files | Lines |
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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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Normal input parser allows flowtables without 'devices' token, which
makes the json export part elide 'dev' entirely, this then breaks on
re-import:
$ nft -j -f json.dump
/tmp/json_1:1:14-14: Error: Object item not found: dev
Signed-off-by: Florian Westphal <fw@strlen.de>
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Failed with: BUG: invalid expresion type symbol
Fixes: 78bbe7f7a55be489 ("mnl: do not use expr->identifier to fetch device name")
Signed-off-by: Florian Westphal <fw@strlen.de>
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flow statement has no export, its shown as:
".. }, "flow add @ft" ] } }"
With this patch:
".. }, {"flow": {"op": "add", "flowtable": "@ft"}}]}}"
Signed-off-by: Florian Westphal <fw@strlen.de>
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Its always 0, so remove it.
Looks like this was intended to support variable options that have
array-like members, but so far this isn't implemented, better remove
dead code and implement it properly when such support is needed.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Add missing "ih" base raw payload and extend tests/py to cover this new
usecase.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Errors emitted by the JSON parser caused BUG() in erec_print() due to
input descriptor values being bogus.
Due to lack of 'include' support, JSON parser uses a single input
descriptor only and it lived inside the json_ctx object on stack of
nft_parse_json_*() functions.
By the time errors are printed though, that scope is not valid anymore.
Move the static input descriptor object to avoid this.
Fixes: 586ad210368b7 ("libnftables: Implement JSON parser")
Signed-off-by: Phil Sutter <phil@nwl.cc>
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The policy is optional, make sure this timeout list is initialized.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Preparation patch to avoid too much $<stmt>$ references in the parser.
Signed-off-by: Florian Westphal <fw@strlen.de>
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If 'kind' value is invalid, the function returned without freeing 'expr'
first. Fix this by performing the check before allocation.
Fixes: cb21869649208 ("json: tcp: add raw tcp option match support")
Signed-off-by: Phil Sutter <phil@nwl.cc>
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Treat '*' as catchall element, not as a symbol.
Also add missing json test cases for wildcard set support.
Signed-off-by: Florian Westphal <fw@strlen.de>
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The json test case for the flagcmp notation ('tcp flags syn,fin / syn,fin') fails with:
command: {"nftables": [{"add": {"rule": {"family": "ip", "table": "test-ip4", "chain": "input", "expr": [{"match": {"left": {"&": [{"payload": {"field": "flags", "protocol": "tcp"}}, ["fin", "syn"]]}, "op": "==", "right": ["fin", "syn"]}}]}}}]}
internal:0:0-0: Error: List expression only allowed on RHS or in statement expression.
internal:0:0-0: Error: Failed to parse RHS of binop expression.
internal:0:0-0: Error: Invalid LHS of relational.
internal:0:0-0: Error: Parsing expr array at index 0 failed.
internal:0:0-0: Error: Parsing command array at index 0 failed.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Store the location of the chain type for better error reporting.
Several users that compile custom kernels reported that error
reporting is misleading when accidentally selecting
CONFIG_NFT_NAT=n.
After this patch, a better hint is provided:
# nft 'add chain x y { type nat hook prerouting priority dstnat; }'
Error: Could not process rule: No such file or directory
add chain x y { type nat hook prerouting priority dstnat; }
^^^
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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Add support for matching on the cgroups version 2.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Otherwise invalid error states cause subsequent json parsing to fail
when it should not.
Signed-off-by: Eric Garver <eric@garver.life>
Signed-off-by: Phil Sutter <phil@nwl.cc>
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The tests fail because json printing omits a burst of 5 and
the parser treats that as 'burst 0'.
Signed-off-by: Florian Westphal <fw@strlen.de>
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unshare -n tests/json_echo/run-test.py
[..]
Adding chain c
free(): double free detected in tcache 2
Aborted (core dumped)
The element must be deleted from the hlist prior to freeing it.
Fixes: 389a0e1edc89a ("json: echo: Speedup seqnum_to_json()")
Signed-off-by: Florian Westphal <fw@strlen.de>
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Introduction of json_cmd_assoc_hash missed that by the time the hash
table insert happens, the struct cmd object's 'seqnum' field which is
used as key is not initialized yet. This doesn't happen until
nft_netlink() prepares the batch object which records the lowest seqnum.
Therefore push all json_cmd_assoc objects into a temporary list until
the first lookup happens. At this time, all referenced cmd objects have
their seqnum set and the list entries can be moved into the hash table
for fast lookups.
To expose such problems in the future, make json_events_cb() emit an
error message if the passed message has a handle but no assoc entry is
found for its seqnum.
Fixes: 389a0e1edc89a ("json: echo: Speedup seqnum_to_json()")
Cc: Derek Dai <daiderek@gmail.com>
Signed-off-by: Phil Sutter <phil@nwl.cc>
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This patch fixes a bug in which nft did not print any output when
specifying --echo and --json and reading nft native syntax.
This patch respects behavior when input is json, in which the output
would be the identical input plus the handles.
Adds a json_echo member inside struct nft_ctx to build and store the json object
containing the json command objects, the object is built using a mock
monitor to reuse monitor json code. This json object is only used when
we are sure we have not read json from input.
[ added json_alloc_echo() to compile without json support --pablo ]
Fixes: https://bugzilla.netfilter.org/show_bug.cgi?id=1446
Signed-off-by: Jose M. Guisado Gomez <guigom@riseup.net>
Tested-by: Eric Garver <eric@garver.life>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Derek Dai reports:
"If there are a lot of command in JSON node, seqnum_to_json() will slow
down application (eg: firewalld) dramatically since it iterate whole
command list every time."
He sent a patch implementing a lookup table, but we can do better: Speed
this up by introducing a hash table to store the struct json_cmd_assoc
objects in, taking their netlink sequence number as key.
Quickly tested restoring a ruleset containing about 19k rules:
| # time ./before/nft -jeaf large_ruleset.json >/dev/null
| 4.85user 0.47system 0:05.48elapsed 97%CPU (0avgtext+0avgdata 69732maxresident)k
| 0inputs+0outputs (15major+16937minor)pagefaults 0swaps
| # time ./after/nft -jeaf large_ruleset.json >/dev/null
| 0.18user 0.44system 0:00.70elapsed 89%CPU (0avgtext+0avgdata 68484maxresident)k
| 0inputs+0outputs (15major+16645minor)pagefaults 0swaps
Bugzilla: https://bugzilla.netfilter.org/show_bug.cgi?id=1479
Reported-by: Derek Dai <daiderek@gmail.com>
Signed-off-by: Phil Sutter <phil@nwl.cc>
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To similar change as in previous one, this time for the
jason (de)serialization.
Re-uses the raw payload match syntax, i.e. base,offset,length.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Currently we're limited to ten template fields in exthdr_desc struct.
Using a single enum for all tpc option fields thus won't work
indefinitely (TCPOPTHDR_FIELD_TSECR is 9) when new option templates get
added.
Fortunately we can just use one enum per tcp option to avoid this.
As a side effect this also allows to simplify the sack offset
calculations. Rather than computing that on-the-fly, just add extra
fields to the SACK template.
expr->exthdr.offset now holds the 'raw' value, filled in from the option
template. This would ease implementation of 'raw option matching'
using offset and length to load from the option.
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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JSON in/output doesn't know about nat_type and thus cannot save/restore
nat mappings involving prefixes or concatenations because the snat
statement lacks the prefix/concat/interval type flags.
Furthermore, bison parser was extended to support netmap.
This is done with an internal 'netmap' flag that is passed to the
kernel. We need to dump/restore that as well.
Also make sure ip/snat.t passes in json mode.
Fixes: 35a6b10c1bc4 ("src: add netmap support")
Fixes: 9599d9d25a6b ("src: NAT support for intervals in maps")
Signed-off-by: Florian Westphal <fw@strlen.de>
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iptables had a "-m socket --transparent" which didn't match sockets that are
bound to all addresses (e.g. 0.0.0.0 for ipv4, and ::0 for ipv6). It was
possible to override this behavior by using --nowildcard, in which case it
did match zero bound sockets as well.
The issue is that nftables never included the wildcard check, so in effect
it behaved like "iptables -m socket --transparent --nowildcard" with no
means to exclude wildcarded listeners.
This is a problem as a user-space process that binds to 0.0.0.0:<port> that
enables IP_TRANSPARENT would effectively intercept traffic going in _any_
direction on the specific port, whereas in most cases, transparent proxies
would only need this for one specific address.
The solution is to add "socket wildcard" key to the nft_socket module, which
makes it possible to match on the wildcardness of a socket from
one's ruleset.
This is how to use it:
table inet haproxy {
chain prerouting {
type filter hook prerouting priority -150; policy accept;
socket transparent 1 socket wildcard 0 mark set 0x00000001
}
}
This patch effectively depends on its counterpart in the kernel.
Signed-off-by: Balazs Scheidler <bazsi77@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Intsead of using an array of char.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The CMD_OBJ_ELEMENTS provides an expression that contains the list of
set elements. This leaves room to introduce CMD_OBJ_SETELEMS in a follow
up patch.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The function tries to insert handles into JSON input for echo option.
Yet there may be nothing to do if the given netlink message doesn't
contain a handle, e.g. if it is an 'add element' command. Calling
seqnum_to_json() is pointless overhead in that case, and if input is
large this overhead is significant. Better wait with that call until
after checking if the message is relevant at all.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Eric Garver <eric@garver.life>
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This helper function adds a statement at the end of the rule statement
list and it updates the rule statement counter.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Store location of chain hook definition.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Duplicate commit 8ac2f3b2fca38's changes to bison parser into JSON
parser by introducing a new context flag signalling we're parsing
concatenated expressions.
Fixes: 8ac2f3b2fca38 ("src: Add support for concatenated set ranges")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Eric Garver <eric@garver.life>
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This will be needed once we add support for the 'typeof' keyword to
handle maps that could e.g. store 'ct helper' "type" values.
Instead of:
set foo {
type ipv4_addr . mark;
this would allow
set foo {
typeof(ip saddr) . typeof(ct mark);
(exact syntax TBD).
This would be needed to allow sets that store variable-sized data types
(string, integer and the like) that can't be used at at the moment.
Adding special data types for everything is problematic due to the
large amount of different types needed.
For anonymous sets, e.g. "string" can be used because the needed size can
be inferred from the statement, e.g. 'osf name { "Windows", "Linux }',
but in case of named sets that won't work because 'type string' lacks the
context needed to derive the size information.
With 'typeof(osf name)' the context is there, but at the moment it won't
help because the expression is discarded instantly and only the data
type is retained.
Signed-off-by: Florian Westphal <fw@strlen.de>
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Also, display handle when listing with '-a'.
Signed-off-by: Eric Jallot <ejallot@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch allows you to dump a named flowtable.
# nft list flowtable inet t f
table inet t {
flowtable f {
hook ingress priority filter + 10
devices = { eth0, eth1 }
}
}
Also:
libnftables-json.adoc: fix missing quotes.
Fixes: db0697ce7f60 ("src: support for flowtable listing")
Fixes: 872f373dc50f ("doc: Add JSON schema documentation")
Signed-off-by: Eric Jallot <ejallot@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch allows you to specify multiple netdevices to be bound to the
netdev basechain, eg.
# nft add chain netdev x y { \
type filter hook ingress devices = { eth0, eth1 } priority 0\; }
json codebase has been updated to support for one single device with the
existing representation, no support for multidevice is included in this
patch.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The function was changed to return an expression or NULL but error
checking wasn't adjusted while doing so.
Fixes: dba4a9b4b5fe2 ("src: allow variable in chain policy")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This fixes a memleak when releasing the compound expression via
expr_free().
Fixes: 92911b362e90 ("src: add support to add flowtables")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Before patch:
# nft -j list ruleset | tee rules.json | jq '.'
{
"nftables": [
{
"metainfo": {
"version": "0.9.2",
"release_name": "Scram",
"json_schema_version": 1
}
},
{
"table": {
"family": "inet",
"name": "t",
"handle": 11
}
},
{
"secmark": {
"family": "inet",
"name": "s",
"table": "t",
"handle": 1,
"context": "system_u:object_r:ssh_server_packet_t:s0"
}
}
]
}
# nft flush ruleset
# nft -j -f rules.json
Segmentation fault
Use "&tmp" instead of "tmp" in json_unpack() while translating "context" keyword.
After patch:
# nft -j -f rules.json
# nft list ruleset
table inet t {
secmark s {
"system_u:object_r:ssh_server_packet_t:s0"
}
}
Fixes: 3bc84e5c1fdd1 ("src: add support for setting secmark")
Signed-off-by: Eric Jallot <ejallot@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
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Size value passed to constant_expr_alloc() must correspond with actual
data size, otherwise wrong portion of data will be taken later when
serializing into netlink message.
Booleans require really just a bit, but make type of boolean_keys be
uint8_t (introducing new 'val8' name for it) and pass the data length
using sizeof() to avoid any magic numbers.
While being at it, fix len value in parser_json.c as well although it
worked before due to the value being rounded up to the next multiple of
8.
Fixes: 9fd9baba43c8e ("Introduce boolean datatype and boolean expression")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Florian Westphal <fw@strlen.de>
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Add support for "synproxy" stateful object. For example (for TCP port 80 and
using maps with saddr):
table ip foo {
synproxy https-synproxy {
mss 1460
wscale 7
timestamp sack-perm
}
synproxy other-synproxy {
mss 1460
wscale 5
}
chain bar {
tcp dport 80 synproxy name "https-synproxy"
synproxy name ip saddr map { 192.168.1.0/24 : "https-synproxy", 192.168.2.0/24 : "other-synproxy" }
}
}
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Pass the location via the handle so the error leg in
erec_print_list() can reference it. Applies to invalid references
to tables, chains, and indexes.
Fixes: 586ad210368b ("libnftables: Implement JSON parser")
Signed-off-by: Eric Garver <eric@garver.life>
Signed-off-by: Phil Sutter <phil@nwl.cc>
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also add a test case.
Fixes: a87f2a2227be2 ("netfilter: support for element deletion")
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Phil Sutter <phil@nwl.cc>
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json restore is broken on big-endian because we errounously
passed uint8_t with 64 bit size indicator.
On bigendian, this causes all values to get shifted by 56 bit,
this will then cause the eval step to bail because all values
are outside of the 8bit 0-255 protocol range.
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Json output could not be restored back by nft because it did
not recognize the new "th" pseudoheader.
Fixes: a43a696443a150f44 ("proto: add pseudo th protocol to match d/sport in generic way")
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch allows you to use variables in chain policy definition, e.g.
define default_policy = "accept"
add table ip foo
add chain ip foo bar {type filter hook input priority filter; policy $default_policy}
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch allows you to use variables in chain priority definitions,
e.g.
define prio = filter
define prionum = 10
define prioffset = "filter - 150"
add table ip foo
add chain ip foo bar { type filter hook input priority $prio; }
add chain ip foo ber { type filter hook input priority $prionum; }
add chain ip foo bor { type filter hook input priority $prioffset; }
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Add support for "synproxy" statement. For example (for TCP port 8888):
table ip x {
chain y {
type filter hook prerouting priority raw; policy accept;
tcp dport 8888 tcp flags syn notrack
}
chain z {
type filter hook input priority filter; policy accept;
tcp dport 8888 ct state invalid,untracked synproxy mss 1460 wscale 7 timestamp sack-perm
ct state invalid drop
}
}
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This modification allow to directly add/list/delete expectations.
Signed-off-by: Stéphane Veyret <sveyret@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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