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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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This patch verifies at command line parsing that given chain type
is valid. Possibilities are: filter, nat, and route.
nft add chain test test { type cheese hook input priority 0 };
<cmdline>:1:28-33: Error: unknown chain type cheese
add chain test test { type cheese hook input priority 0 };
^^^^^^
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This allows to use unique, human readable, hook names for the command
line and let the user being unaware of the complex netfilter's hook
names and there difference depending on the netfilter family.
So:
add chain foo bar { type route hook NF_INET_LOCAL_IN 0; }
becomes:
add chain foo bar { type route hook input 0; }
It also fixes then the difference in hook values between families.
I.e. ARP family has different values for input, forward and output
compared to IPv4, IPv6 or bridge.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch allows you to specify the type of the base chain, eg.
add table mangle
add chain mangle OUTPUT { type route hook NF_INET_LOCAL_OUT 0; }
The chain type determines the semantics of the chain, we currently
have three types:
* filter, used for plain packet filtering.
* nat, it only sees the first packet of the flow.
* route, which is the equivalent of the iptables mangle table, that
triggers a re-route if there is any change in some of the packet header
fields, eg. IP TOS/DSCP, or the packet metainformation, eg. mark.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds support to insert and to add rule using a rule
handle as reference. The rule handle syntax has an new optional
position field which take a handle as argument.
Two examples:
nft add rule filter output position 5 ip daddr 1.2.3.1 drop
nft insert rule filter output position 5 ip daddr 1.2.3.1 drop
Signed-off-by: Eric Leblond <eric@regit.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Improve error reporting by always using a location in netlink operations.
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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Recent kernel versions are using 64 bit for the rule handle.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Base chains with both a hook number and priority of zero are created
as regular chains. Fix by adding a BASECHAIN flag indicating that the
chain should be created as a base chain.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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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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As a first step towards stand-alone sets, add support for scoping and
binding symbols. This will be used for user-defined constants, as well
as declarations of modifiable (stand-alone) sets once the kernel side
is ready.
Scopes are currently limited to three nesting levels: the global scope,
table block scopes and chain block scopes.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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Signed-off-by: Patrick McHardy <kaber@trash.net>
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