This patch migrates nft to use the libnftables library, that is used
by the iptables over nftables compat utility as well. Most of the
conversion was pretty straight forward. Some small significant changes
happened in the handling of set element and immediate data abstraction
that libnl provides. libnftables is a bit more granular since it splits
the struct nfnl_nft_data into three attributes: verdict, chain and plain
data (used in maps).
I have added a new file src/mnl.c that contains the low level netlink
communication that now resides in nftables source tree instead of
the library. This should help to implement the batching support using
libmnl in follow up patches.
I also spent some significant amount of time running my tests to make
sure that we don't increase the number of bugs that we already have
(I plan to provide a list of those that I have detected and diagnosed,
so anyone else can help us to fix them).
As a side effect, this change should also prepare the ground for
JSON and XML support anytime soon.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Eric Leblond [Sat, 8 Jun 2013 23:08:47 +0000 (01:08 +0200)]
src: fix counter restoration
It was not possible to restore a ruleset countaining counter. The
packets and bytes fields were not known from the parser but they
were in the output of the list command.
This patch fixes the issue by restoring correctly the counters if
they are present in the command.
Signed-off-by: Eric Leblond <eric@regit.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
datatype: concat expression only releases dynamically allocated datatype
Eric Leblond reports a crash with the following invalid command:
nft add rule global filter ip daddr . tcp dport { 192.168.0.1 . 22\; 192.168.0.3 . 89 } drop
Note that the semicolon is incorrect in that concatenation,
it should be a comma.
The backtrace shows:
(gdb) bt
#0 0x00007ffff6f39295 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007ffff6f3c438 in __GI_abort () at abort.c:90
#2 0x00007ffff6f7486b in __libc_message (do_abort=do_abort@entry=2, fmt=fmt@entry=0x7ffff7070d28 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:199
#3 0x00007ffff6f7eac6 in malloc_printerr (action=3, str=0x7ffff706ccca "free(): invalid pointer", ptr=<optimized out>) at malloc.c:4902
#4 0x00007ffff6f7f843 in _int_free (av=<optimized out>, p=0x428530, have_lock=0) at malloc.c:3758
#5 0x000000000041aae8 in xfree (ptr=0x428540 <invalid_type>) at src/utils.c:29
#6 0x000000000040bc43 in concat_type_destroy (dtype=0x428540 <invalid_type>) at src/datatype.c:690
#7 0x000000000040cebf in concat_expr_destroy (expr=0x643b90) at src/expression.c:571
[...]
It's trying to release 'invalid_type', which was not dynamically
allocated. Note that before the evaluation step, the invalid type
is attached to the expressions.
Since nftables allocates a dynamic datatype for concatenations in
case that needs to be released in the exit path. All datatypes
except this, are allocated in the BSS. Since we have no way to
differenciate between these two, add a flag so we can recognize
dynamically allocated datatypes.
While at it, rename dtype->type from enum to explicit uint32_t, as
it is used to store the concatenation type mask as well.
Reported-by: Eric Leblond <eric@regit.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Eric Leblond [Fri, 31 May 2013 08:50:32 +0000 (10:50 +0200)]
rule: list elements in set in any case
"nft list table" command was not displaying the elements of named
set. This was thus not possible to restore a ruleset by using the
listing output. This patch modifies the code to display the elements
of set in all cases.
Eric Leblond [Thu, 30 May 2013 04:22:46 +0000 (04:22 +0000)]
rule: add flag to display rule handle as comment
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>
cli: complete basic functionality of the interactive mode
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>
Patrick McHardy [Mon, 15 Apr 2013 14:16:04 +0000 (16:16 +0200)]
types: add ethernet address type
Add a new type for ethernet addresses. This is needed since for concatenations
we need fixed sized data types, the generic link layer address doesn't have
a fixed length.
Patrick McHardy [Mon, 15 Apr 2013 14:18:17 +0000 (16:18 +0200)]
datatype: parse/print in all basetypes subsequently
Go down the chain of basetypes until we find a ->parse()/->print() callback
or symbol table. Needed to invoke the generic link layer address parsing
function for the etheraddr_type.
Patrick McHardy [Mon, 10 Dec 2012 15:20:14 +0000 (16:20 +0100)]
cmd: fix handle use after free for implicit set declarations
The implicit set declaration passes the set's handle to cmd_alloc(), which copies
the pointers to the allocated strings. Later on both the set's handle and the
commands handle are freed, resulting in a use after free.
Patrick McHardy [Sun, 9 Dec 2012 12:35:23 +0000 (13:35 +0100)]
sets: fix sets using intervals
When using intervals, the initializers set_flags are set to SET_F_INTERVAL,
however that is not propagated back to the set, so the segtree construction
is not performed.
Patrick McHardy [Sun, 9 Dec 2012 13:55:03 +0000 (14:55 +0100)]
netlink: fix endless loop on 64 bit when parsing binops
mpz_scan1() returns ULONG_MAX when no more bits are found. Due to assignment
to an unsigned int, this value was truncated on 64 bit and the loop never
terminated.
Patrick McHardy [Sat, 8 Dec 2012 19:42:16 +0000 (20:42 +0100)]
seqtree: update mapping data when keeping the base
When a prefix expression is followed by another prefix expression using the
same base but a wider prefix, we need to update the mapping data to that of
the second expression.
Patrick McHardy [Wed, 5 Dec 2012 18:45:22 +0000 (19:45 +0100)]
evaluate: reintroduce type chekcs for relational expressions
Since the parser can now generate constant expressions of a specific type
not determinaed by the LHS, we need to check that relational expressions
are actually using the correct types to avoid accepting stupid things
like "tcp dport tcp".
Patrick McHardy [Wed, 5 Dec 2012 18:39:00 +0000 (19:39 +0100)]
parser: fix parsing protocol names for protocols which are also keywords
"ip protocol tcp" will currently produce a syntax error since tcp is also a keyword
which is expected ot be followed by a tcp header field. Allow to use protocol names
that are also keywords and allocate a constant expression for them.
Patrick McHardy [Tue, 6 Jul 2010 03:57:23 +0000 (05:57 +0200)]
netlink: fix nat stmt linearization/parsing
Fix invalid register use when parsing NAT statements and handle range expressions
during postprocessing. When linearizing, allocate all registers for both proto and
address expressions at once to avoid double use.
Patrick McHardy [Tue, 6 Jul 2010 03:57:22 +0000 (05:57 +0200)]
payload: fix crash with uncombinable protocols
The dependency of non-combinable protocols (f.i. arp + tcp) results in
a relational dependency expression without a datatype, causing a segfault
later on.
Patrick McHardy [Tue, 6 Jul 2010 03:57:22 +0000 (05:57 +0200)]
netlink: fix creation of base chains with hooknum and priority 0
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.
Patrick McHardy [Tue, 6 Jul 2010 03:57:00 +0000 (05:57 +0200)]
parser: support bison >= 2.4
Work around stange behaviour in bison >= 2.4 (see large comment in parser.y for
details) and remove the skeleton file since it does not work with 2.4 anymore.
Its only purpose was to increase the amount of possible tokens reported in error
messages anyways.
Patrick McHardy [Tue, 28 Jul 2009 12:17:41 +0000 (14:17 +0200)]
netlink: dump all chains when listing rules
Currently only the rules are dumped and chains are constructed based
on the rules identities. Dump all chains manually to make sure we also
display empty chains.
Patrick McHardy [Tue, 31 Mar 2009 02:14:26 +0000 (04:14 +0200)]
datatype: maintain table of all datatypes and add registration/lookup function
Add a table containing all available datatypes and registration/lookup functions.
This will be used to associate a stand-alone set in the kernel with the correct
type without parsing the entire ruleset.
Additionally it would now be possible to remove the global declarations for the
core types. Not done yet though.
Patrick McHardy [Fri, 20 Mar 2009 15:17:51 +0000 (16:17 +0100)]
Fix multiple references to the same user defined symbolic expression
The expression needs to be cloned so transformations don't corrupt the original
expression. This could be slightly optimized by only taking a reference and
COW'ing when necessary (which is actually quite rare).
projects / thirdparty / nftables.git / log
