iptables 1.4.20 release

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
xt_socket: add --nowildcard flag

xt_socket module can be a nice replacement to conntrack module
in some cases (SYN filtering for example)

But it lacks the ability to match the 3rd packet of TCP
handshake (ACK coming from the client).

Add a XT_SOCKET_NOWILDCARD flag to disable the wildcard mechanism

The wildcard is the legacy socket match behavior, that ignores
LISTEN sockets bound to INADDR_ANY (or ipv6 equivalent)

iptables -I INPUT -p tcp --syn -j SYN_CHAIN
iptables -I INPUT -m socket -j ACCEPT

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
extensions: libxt_socket: update man page

Document --nowildcard option and its implications when using -m socket
to intercept packets.

While at it, update man page with Balazs Scheidlers comments from
nf_tproxy_core.h in kernel tree to better explain how lookup is performed.

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
doc: add libnetfilter_queue pointer to libxt_NFQUEUE.man

... and remove the QUEUE snippets from ip(6)tables man page,
the queue target was replaced by nfqueue years ago.
Fix up a couple of needless differences in ip(6)tables.8, too.

Signed-off-by: Florian Westphal <fw@strlen.de>