ipfw3: insert the new rule in the beginning

"ipfw3 add" is still the same, while the "ipfw3 insert" is the new method
which will insert the new rule in the beginning of the rule list.

Fix LINT64 for the recent ipfw3 changes.

Reported-by: ftigeot

ipfw3_nat: highspeed lockless in-kernel NAT

RB-Tree to stored the state for the outgoing packets, and multidimentional
array of pointers to keep the state for the incoming packets.

ipfw3: remove legacy macros

contrib/libpcap - Local adjustments

- Use system's net/bpf.h instead of libpcap's one.
- Will help fixing net/vde2 and possible other ports that use a
combination of net/bpf.h and pcap.h as descri

contrib/libpcap - Local adjustments

- Use system's net/bpf.h instead of libpcap's one.
- Will help fixing net/vde2 and possible other ports that use a
combination of net/bpf.h and pcap.h as described in f92f178f07f

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dummynet: Don't deliver freed mbuf to callers.

ipfw3: lockless in-kernel NAT

The libalias is used in kernel space for in-kernel NAT, and its alias_link
entries are stored with LIST. so all the packets which need to be NAT will scan
against the L

ipfw3: lockless in-kernel NAT

The libalias is used in kernel space for in-kernel NAT, and its alias_link
entries are stored with LIST. so all the packets which need to be NAT will scan
against the LIST and trying to find the matched alias_link. by seperating the
libalias into context of different CPUs, the lock can be removed. and due to the
nature of NAT, the outgoing and incoming packets are possible to be handled by
different CPUs, to ensure the returning packet can be translated properly, the
newly created alias_link is required to be duplicated and inserted into contexts
of both CPUs.

e.g.
ipfw3 nat 1 config if em0
ipfw3 nat 1 all via em0
ipfw3 nat 1 show state

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ipfw3: new feature 'ipfwsync'

ipfwsync is a new feature to synchronize firewall states between machines
which is running ipfw3 firewall for high availability. ipfw3 can be configured
in centre or ed

ipfw3: new feature 'ipfwsync'

ipfwsync is a new feature to synchronize firewall states between machines
which is running ipfw3 firewall for high availability. ipfw3 can be configured
in centre or edge mode. the centre will automatically sync the states from
centre to the edge.

e.g.
ipfw3 sync edge 5000
ipfw3 sync start edge

ipfw3 sync centre 192.168.1.1:5000,192.168.1.2:5000
ipfw3 sync start centre

ipfw3 sync show config
ipfw3 sync show status
ipfw3 sync test centre 123

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ipfw3: shorten func show_filter and MACRO

ipfw3: misc fix

ipfw3: support lookup tables

ipfw3: show NAT records

show all 'NAT records' which relate to the 'NAT config 1'
which is same as 'ip show nat translation' in CISCO routers.

usage:
ipfw3 nat 1 show state

ipfw3: support bpf filter in layer4 module

syntax:
bpf "<bpf string>"
e.g.
ipfw3 add allow all bpf "icmp and src 8.8.8.8"

bpf can be used to filter the packet payload.

pcap_compile_nocap was used

ipfw3: support bpf filter in layer4 module

syntax:
bpf "<bpf string>"
e.g.
ipfw3 add allow all bpf "icmp and src 8.8.8.8"

bpf can be used to filter the packet payload.

pcap_compile_nocap was used to compile the bpf string
and bpf_filter for the filtering.

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License: Preserve previous licensor information

kernel/ipfw3: Fix LINT64 building.

* Remove a duplicate definition of DPRINTF().

* Fix a DPRINTF() argument.

ipfw2 - Rename FreeBSD ipfw port to ipfw3

* Rename all elements of the port to ipfw3 to reduce confusion.