| Commit message (Collapse) | Author | Age | Files | Lines |
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Make sure the table that we want to rename already exist. This is required by
the follow up patch that that adds chains to the cache.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds set objects to the cache if they don't exist in the kernel, so
they can be referenced from this batch. This occurs from the evaluation step.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch populates the cache only once through netlink_list_sets() during
evaluation. As a result, there is a single call to netlink_list_sets().
After this change, we can rid of get_set(). This function was fine by the time
we had no transaction support, but this doesn't work for set objects that are
declared in this batch, so inquiring the kernel doesn't help since they are not
yet available.
As a result from this update, the monitor code gets simplified quite a lot
since it can rely of the set cache. Moreover, we can now validate that the
table and set exists from evaluation path.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Add declared table objects to the cache, thus we can refer to objects that
come in this batch but that are not yet available in the kernel. This happens
from the evaluation step.
Get rid of code that is doing this from the later do_command_*() stage.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This function validates that the table that we want to list already exists by
looking it up from the cache.
This also adds cmd_error() to display an error from the evaluation step, when
the objects that the rule indicates do not exist.
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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This patch adds support for the new 'netdev' table. So far, this table allows
you to create filter chains from ingress.
The following example shows a very simple base configuration with one table that
contains a basechain that is attached to the 'eth0':
# nft list table netdev filter
table netdev filter {
chain eth0-ingress {
type filter hook ingress device eth0 priority 0; policy accept;
}
}
You can test that this works by adding a simple rule with counters:
# nft add rule netdev filter eth0-ingress counter
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Since we need to calculate the length of the entire concat type, we can
not support variable sized types where the length can't be determined
by the type.
This only affects base types since all higher types include a length.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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The set statement is used to dynamically add or update elements in a set.
Syntax:
# nft filter input set add tcp dport @myset
# nft filter input set add ip saddr timeout 10s @myset
# nft filter input set update ip saddr timeout 10s @myset
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Timeout support can be enabled in one of two ways:
1. Using a default timeout value:
set test {
type ipv4_addr;
timeout 1h;
}
2. Using the timeout flag without a default:
set test {
type ipv4_addr;
flags timeout;
}
Optionally a garbage collection interval can be specified using
gc-interval <interval>;
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Add a new expression type "set_elem_expr" that is used as container for
the key in order to attach different attributes, such as timeout values,
to the key.
The expression hierarchy is as follows:
Sets:
elem
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key
Maps:
mapping
/ \
elem data
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key
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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When using a symbolic vmap expression, we fail to verify that the map
actually contains verdicts.
Use stmt_evaluate_arg() everywhere to fix this.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Catch type errors in map expressions using named maps:
# nft add map filter test { type ipv4_addr : inet_service; }
# nft filter output mark set tcp dport map @test
<cmdline>:1:38-42: Error: datatype mismatch, map expects IPv4 address, mapping expression has type internet network service
filter output mark set tcp dport map @test
~~~~~~~~~ ^^^^^
Signed-off-by: Patrick McHardy <kaber@trash.net>
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The datatype of the map expression is the datatype of the mappings.
# nft add map filter test { type ipv4_addr : inet_service; }
# nft filter output mark set ip daddr map @test
Before:
<cmdline>:1:24-41: Error: datatype mismatch: expected packet mark, expression has type IPv4 address
filter output mark set ip daddr map @test
~~~~~~~~~^^^^^^^^^^^^^^^^^^
After:
<cmdline>:1:24-41: Error: datatype mismatch: expected packet mark, expression has type internet network service
filter output mark set ip daddr map @test
~~~~~~~~~^^^^^^^^^^^^^^^^^^
Signed-off-by: Patrick McHardy <kaber@trash.net>
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# nft add set filter test { type ipv4_addr; }
# nft filter input ip daddr vmap @test
Before:
<cmdline>:0:0-32: Error: Could not process rule: Invalid argument
filter input ip daddr vmap @test
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
After:
<cmdline>:1:28-32: Error: Expression is not a map
filter input ip daddr vmap @test
^^^^^
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Signed-off-by: Patrick McHardy <kaber@trash.net>
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Add a helper function to evaluate expressions used as arguments for
statements and report datatype mismatches.
Fixes acceptance of mismatching expressions like:
$ nft filter output meta mark set ip daddr
<cmdline>:1:29-36: Error: datatype mismatch: expected packet mark. expression has type IPv4 address
filter output meta mark set ip daddr
~~~~~~~~~~~~~~^^^^^^^^
Signed-off-by: Patrick McHardy <kaber@trash.net>
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The redir and masq evaluation functions include some useless context
updates and checks.
Refactor the NAT code to have a single instance of address and transport
evaluation functions for simplicity and unified error reporting.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Use stdio's vasprintf instead of gmp_vasprintf which is not part
of the mini-gmp function subset. Furthermore convert the only
gmp-specific user and allow the compiler to verify format-strings.
Signed-off-by: Steven Barth <cyrus@openwrt.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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When nft -f is used, ctx->cmd points to the table object, which
contains the corresponding chain, set and rule lists. The reject
statement evaluator relies on ctx->cmd->rule to add the payload
dependencies, which is doesn't point to the rule in that case.
This patch adds the rule context to the eval_ctx structure to update
the rule list of statements when generating dependencies, as the reject
statement needs.
Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=993
Reported-by: Ting-Wei Lan <lantw44@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The kernel only stored the id so we need to be able to reconstruct
the datatype from the id only.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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The id of concat datatypes is composed of the ids of the individual
datatypes. Add a define for the number of bits for each datatype id
and a mask.
The number of bits is chosen as 6, allowing for 63 datatypes, or twice
as much as we currently have. This allows for concatenations of 5
types using 32 bits.
The value is statically chosen instead of basing it on the current
numbers of datatypes since we don't want the maximum concatenation
size to vary between versions, also new versions are supposed to be
able to propery parse a ruleset generated by an older version.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Using the size is confusing since it usually holds the size of
the data. Add a new "subtypes" member, which holds the number
of datatypes the concat type is made of.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Rules with header fields that rely on the generic integer datatype
from sets are not matching, eg.
nft add rule filter input udp length { 9 } counter
This set member is an integer represented in host byte order, which
obviously doesn't match the header field (in network byte order).
Since the integer datatype has no specific byteorder, we have to rely
on the expression byteorder instead when configuring the context,
before we evaluate the list of set members.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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If we use tcp reset with a network protocol that tcp is not supported,
we display an error. This error use the reject.expr location which is NULL,
therefore we have a crash. This patch replaces it using the reject statement
to display the error like:
Rule:
nft add bridge filter input ether type vlan reject with tcp reset
Output:
<cmdline>:1:46-51: Error: cannot reject this ether type
add rule bridge filter input ether type vlan reject with tcp reset
~~~~~~~~~~~~~~~ ^^^^^^
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds redirect support for nft.
The syntax is:
% nft add rule nat prerouting redirect [port] [nat_flags]
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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If we add a rule like:
nft add rule bridge filter input ether type ip reject with icmpv6 type no-route
We throw an error like:
<cmdline>:1:44-49: Error: conflicting protocols specified: ip vs ip6
add rule bridge filter input ether type ip reject with icmpv6 type no-route
Now, we are going to show in which part of the rule, we have the conflict:
<cmdline>:1:51-75: Error: conflicting protocols specified: ip vs ip6
add rule bridge filter input ether type ip reject with icmpv6 type no-route
~~~~~~~~~~~~~ ^^^^^^^^^^^^^^^^^^^^^^^^^
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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inet tables
In rules like:
nft add rule inet filter input reject
or
nft add rule bridge filter input reject
we use icmpx to reject it. But if we have network context, we also use type of
reject. With this patch, we check the network context. If we don't have context,
we still use icmpx. However, if we have rules with network context like:
nft add rule inet meta nfproto ipv4 reject
or
nft add rule bridge ether type ipv6 reject
We are going to use icmp or icmpv6 to reject it taking into account the network
context.
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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In Inet tables, we have to check the network context in rules that we use
icmp or icmpv6 reason in reject. To be sure that the context is the correct.
However, for icmpx and tcp reject, we don't need to check it.
In Bridge tables, ee have vlan and arp traffic and they are not supported.
For this things, we have to check the network context. For example:
nft add rule bridge test-bridge input \
ether type arp reject with icmp type host-unreachable
or
nft add rule bridge test-bridge input \
ether type vlan reject with tcp reset
In that cases, we have to throw an error. Moreover, we have to accept rules
that the network context is Ipv4 and Ipv6. For example:
nft add rule -nnn bridge test-bridge input \
ip protocol tcp reject with tcp reset
Moreover, this patch refactor the code for check the family for bridge and inet
tables.
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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nft add rule bridge test-bridge input ether type ip \
reject with icmpv6 type no-route
This rule pass the evaluation step but the network context is incompatible with
the reject reason. In that cases, we have to throw an error like "conflicting
protocols specified: ip vs ip6"
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Example:
nft add rule inet filter input meta l4proto udp reject with tcp reset
If we try to check if the transport protocol is tcp, we use the network context.
If we don't have this network context, we have a crash.
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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If we use this rule:
nft add rule bridge filter input \
ether type ip reject with icmp type host-unreachable
or that:
nft add rule inet filter input \
meta nfproto ipv4 reject with icmp type host-unreachable
we have a segfault because we add a network dependency when we already have
network context.
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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If we use a rule:
nft add rule bridge filter input \
ether type ip reject with icmp type host-unreachable
or this:
nft add rule inet filter input \
meta nfproto ipv4 reject with icmp type host-unreachable
we have a segfault because we add a network dependency when we already have
network context.
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds masquerade support for nft.
The syntax is:
% nft add rule nat postrouting masquerade [flags]
Currently, flags are:
random, random-fully, persistent
Example:
% nft add rule nat postrouting masquerade random,persistent
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Postpone the event type interpretation to the evaluation step.
This patch also fixes the combination of event and object types,
which was broken. The export code needed to be adjusted too.
The new and destroy are not tokens that can be recognized by
the scanner anymore, so this also implicitly restores 'ct state'.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch allows to use the reject action in rules. For example:
nft add rule filter input udp dport 22 reject
In this rule, we assume that the reason is network unreachable. Also
we can specify the reason with the option "with" and the reason. For example:
nft add rule filter input tcp dport 22 reject with icmp type host-unreachable
In the bridge tables and inet tables, we can use this action too. For example:
nft add rule inet filter input reject with icmp type host-unreachable
In this rule above, this generates a meta nfproto dependency to match
ipv4 traffic because we use a icmpv4 reason to reject.
If the reason is not specified, we infer it from the context.
Moreover, we have the new icmpx datatype. You can use this datatype for
the bridge and the inet tables to simplify your ruleset. For example:
nft add rule inet filter input reject with icmpx type host-unreachable
We have four icmpx reason and the mapping is:
ICMPX reason | ICMPv6 | ICMPv4
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admin-prohibited | admin-prohibited | admin-prohibited
port-unreachable | port-unreachable | port-unreachable
no-route | no-route | net-unreachable
host-unreachable | addr-unreachable | host-unreachable
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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With this patch, this function returns a statement with the new dependency
that we want to add, instead of an expression.
This change is needed in a follow up patch.
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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- Rename keyword tokens to their actual keyword
- Change the grammar to follow the standard schema for statements and arguments
- Use actual expression for the queue numbers to support using normal range
expressions, symbolic expression and so on.
- restore comma seperation of flag keywords
The result is that its possible to use standard ranges, prefix expressions,
symbolic expressions etc for the queue number. We get checks for overflow,
negative ranges and so on automatically.
The comma seperation of flags is more similar to what we have for other
flag values. It is still possible to use spaces, however this could be
removed since we never had a release supporting that.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Before this patch:
# nft describe tcp foo
value expression, datatype inet_proto (Internet protocol) (basetype integer), 8 bits
Segmentation fault
After this patch:
# nft describe tcp foo
<cmdline>:1:14-16: Error: syntax error, unexpected string, expecting end of file or newline or semicolon
describe tcp foo
^^^
Reported-by: Kevin Fenzi <kevin@scrye.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch is required if you use upcoming Linux kernels >= 3.17
which come with a complete logging support for nf_tables.
If you use 'log' without options, the kernel logging buffer is used:
nft> add rule filter input log
You can also specify the logging prefix string:
nft> add rule filter input log prefix "input: "
You may want to specify the log level:
nft> add rule filter input log prefix "input: " level notice
By default, if not specified, the default level is 'warn' (just like
in iptables).
If you specify the group, then nft uses the nfnetlink_log instead:
nft> add rule filter input log prefix "input: " group 10
You can also specify the snaplen and qthreshold for the nfnetlink_log.
But you cannot mix level and group at the same time, they are mutually
exclusive.
Default values for both snaplen and qthreshold are 0 (just like in
iptables).
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The type in the evaluation context needs to be reset to avoid treating
the concatenation as a right hand side relational expression.
# nft filter output mark set ip daddr . tcp dport map { 192.168.0.1 . 22 : 1 }
<cmdline>:1:24-43: Error: datatype mismatch, expected packet mark, expression has type concatenation of (IPv4 address, internet network service)
filter output mark set ip daddr . tcp dport map { 192.168.0.1 . 22 : 1 }
^^^^^^^^^^^^^^^^^^^^
Signed-off-by: Patrick McHardy <kaber@trash.net>
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This patch reverts Alvaro's 34040b1 ("reject: add ICMP code parameter
for indicating the type of error") and 11b2bb2 ("reject: Use protocol
context for indicating the reject type").
These patches are flawed by two things:
1) IPv6 support is broken, only ICMP codes are considered.
2) If you don't specify any transport context, the utility exits without
adding the rule, eg. nft add rule ip filter input reject.
The kernel is also flawed when it comes to the inet table. Let's revert
this until we can provide decent reject reason support.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch allows to indicate the ICMP code field in case that we
use to reject. Before, we have always sent network unreachable error
as ICMP code, now we can explicitly indicate the ICMP code that
we want to use. Examples:
nft add rule filter input tcp dport 22 reject with host-unreach
nft add rule filter input udp dport 22 reject with host-unreach
In this case, it will use the host unreachable code to reject traffic.
The default code field still is network unreachable and we can also
use the rules without the with like that:
nft add rule filter input udp dport 22 reject
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch uses the protocol context to initialize the reject type
considering if the transport protocol is tcp, udp, etc. Before this
patch, this was left unset.
Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds a basic events reporting option to nft.
The syntax is:
% nft monitor [new|destroy] [tables|chains|rules|sets|elements] [xml|json]
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 adds the possibility to set ct keys using nft. Currently, the
connection mark is supported. This functionality enables creating rules
performing the same action as iptables -j CONNMARK --save-mark. For example:
table ip filter {
chain postrouting {
type filter hook postrouting priority 0;
ip protocol icmp ip daddr 8.8.8.8 ct mark set meta mark
}
}
My patch is based on the original http://patchwork.ozlabs.org/patch/307677/
by Kristian Evensen <kristian.evensen@gmail.com>.
I simply did a rebase and some testing. To test, I added rules like these:
counter meta mark set 1 counter
counter ct mark set mark counter
counter ct mark 1 counter
The last matching worked as expected, which means the second rule is also
working as expected.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Acked-by: Kristian Evensen <kristian.evensen@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The commit e7b43ec0 [expr: make expr_binary_error() usable outside of evaluation]
seem to change expr_binary_error() interface.
Later, several compilation warning appears.
The expr_binary_error() function and expr_error() macro both expect
`struct list_head *', so I simply changed callers to send `ctx->msgs'.
[...]
src/evaluate.c: In function ‘byteorder_conversion’:
src/evaluate.c:166:3: warning: passing argument 1 of ‘expr_binary_error’ from incompatible pointer type [enabled by default]
In file included from src/evaluate.c:21:0:
include/expression.h:275:12: note: expected ‘struct list_head *’ but argument is of type ‘struct eval_ctx *’
src/evaluate.c: In function ‘expr_evaluate_symbol’:
src/evaluate.c:204:4: warning: passing argument 1 of ‘expr_binary_error’ from incompatible pointer type [enabled by default]
In file included from src/evaluate.c:21:0:
include/expression.h:275:12: note: expected ‘struct list_head *’ but argument is of type ‘struct eval_ctx *’
[...]
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Patrick McHardy <kaber@trash.net>
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